Spectrum acquisition method and device

Abstract

A spectrum acquisition method and device belong to the technical field of optics. The spectrum acquisition device comprises a light splitting unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit, the light splitting unit is used for receiving a light beam from the light source, splitting the light beam into a first polarization component and a second polarization component which are different in polarization direction, transmitting the first polarization component to the first spectrum calculation unit, and transmitting the second polarization component to the second spectrum calculation unit. The first spectrum calculation unit is used for calculating the spectrum of the first polarization component; the second spectrum calculation unit is used for calculating the spectrum of the second polarization component; the processing unit is used for obtaining the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component. According to the spectrum acquisition device, the problem that the computational spectrometer cannot determine the spectrum of the light beam when the light beam is the non-polarized light can be solved, and the spectrum acquisition device provided by the invention can acquire the spectrum of the light beam when the light beam is the non-polarized light. The method is used for acquiring the spectrum.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a spectrum acquisition method and device. Background Art

[0002] With the development of optical technology, spectrometers are used more and more widely. Spectrometers can analyze the received light beam and obtain the spectrum of the light beam.

[0003] There are many types of spectrometers, such as computational spectrometers, dispersive spectrometers, and Fourier spectrometers. Among them, computational spectrometers are smaller in size and have higher spectral analysis efficiency. Computational spectrometers include: a dielectric layer, a detector array, and a processing module. After passing through the dielectric layer, the polarized light beam is transmitted to the detector array, which can detect the received polarized light beam and obtain the spatial distribution of the intensity of the polarized light beam; the processing module can obtain the spectrum of the polarized light beam based on the spatial distribution of the intensity.

[0004] However, the light beam received by the spectrometer usually has multiple polarization components, and the above-mentioned dielectric layer usually has dual polarization characteristics, so the transmission conditions of different polarization components of the light beam in the dielectric layer are different, resulting in different spatial distributions of the intensity of different polarization components. In this way, the result detected by the detector array is not the spatial distribution of the intensity of one polarization component, and the processing module cannot determine the spectrum of the light beam based on the detection result of the detector array. Summary of the invention

[0005] The present application provides a spectrum acquisition method and device, which can solve the problem that a computational spectrometer cannot determine the spectrum of a light beam based on the detection results of a detector array. The technical solution is as follows:

[0006] In a first aspect, the present application provides a spectrum acquisition device, which includes: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; wherein the spectroscopic unit is used to receive a light beam from a light source, and to divide the light beam into a first polarization component and a second polarization component with different polarization directions. The spectroscopic unit is also used to transmit the first polarization component to the first spectrum calculation unit, and to transmit the second polarization component to the second spectrum calculation unit. The first spectrum calculation unit is used to calculate the spectrum of the first polarization component; the second spectrum calculation unit is used to calculate the spectrum of the second polarization component; the processing unit is used to obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component. For example, the processing unit adds the spectrum of the first polarization component to the spectrum of the second polarization component to obtain the spectrum of the light beam.

[0007] By way of example, the first calculated spectrum unit includes: a first dielectric layer, a first detector array and a first processing module; the second calculated spectrum unit includes: a second dielectric layer, a second detector array and a second processing module; the spectroscopic unit is used to transmit the first polarization component to the first dielectric layer; the first detector array is used to detect the first polarization component passing through the first dielectric layer, and obtain the intensity spatial distribution of the first polarization component; the first processing module is used to calculate the spectrum of the first polarization component according to the intensity spatial distribution of the first polarization component; the spectroscopic unit is used to transmit the second polarization component to the second dielectric layer; the second detector array is used to detect the second polarization component passing through the second dielectric layer, and obtain the intensity spatial distribution of the second polarization component; the second processing module is used to calculate the spectrum of the second polarization component according to the intensity spatial distribution of the second polarization component.

[0008] Optionally, the first processing module, the second processing module and the processing unit are integrated. Alternatively, the first processing module, the second processing module and the processing unit are independent of each other. This embodiment of the application does not limit this.

[0009] In summary, in the spectrum acquisition device provided by the present application, since the spectroscopic unit divides the light beam of the spectrum to be analyzed into two polarization components, and the first spectrum calculation unit and the second spectrum calculation unit respectively obtain the spectrum detection of the two polarization components, and then the processing unit obtains the spectrum of the light beam according to the spectra of the two polarization components. In this way, when the light beam is non-polarized light, the spectrum acquisition device can also obtain the spectrum of the light beam. In addition, the spectrum acquisition device can not only obtain the spectrum of non-polarized light, but also the spectrum of polarized light, so the spectrum acquisition device has low requirements for the light beam that needs to be analyzed.

[0010] The computational spectrum unit in the spectrum acquisition device uses the same principle as the computational spectrometer to acquire spectra. Therefore, compared with the dispersion type spectrometer, the spectrum acquisition device has the characteristics of low process requirements, low preparation difficulty, low requirements for the beam intensity of the spectrum to be analyzed, and smaller size at the same resolution; compared with the Fourier type spectrometer, the spectrum acquisition device has the characteristics of smaller size at the same resolution and faster speed in acquiring the spectrum of the light beam.

[0011] The polarization direction of the first polarization component in the embodiment of the present application is different from the polarization direction of the second polarization component, and the present application does not limit the polarization directions of the first polarization component and the second polarization component. Optionally, the first polarization component and the second polarization component are orthogonal to each other, and in this case, the polarization direction of the first polarization component is perpendicular to the polarization direction of the second polarization component. It is understandable that the first polarization component and the second polarization component may not be orthogonal. In addition, the first polarization component may not be indicated, and the second polarization component may not be indicated.

[0012] Furthermore, the above-mentioned light splitting unit has multiple implementable modes.

[0013] (1) In one possible implementation of the optical splitting unit, the optical splitting unit includes: an optical fiber polarization beam splitter. The optical fiber polarization beam splitter includes: an input optical fiber, a first output optical fiber, a second output optical fiber, and an optical splitter.

[0014] The input optical fiber is a non-polarization-maintaining optical fiber, the first output optical fiber is a polarization-maintaining optical fiber for transmitting a first polarization component, and the second output optical fiber is a polarization-maintaining optical fiber for transmitting a second polarization component. One end of the input optical fiber, one end of the first output optical fiber, and one end of the second output optical fiber are all connected to a spectrometer, the other end of the first output optical fiber is connected to a first calculated spectrum unit (such as a first dielectric layer in the first calculated spectrum unit), and the other end of the second output optical fiber is connected to a second calculated spectrum unit (such as a second dielectric layer in the second calculated spectrum unit).

[0015] The input optical fiber is used to transmit the light beam from the light source to the optical splitter; the optical splitter is used to split the light beam from the input optical fiber to obtain a first light beam and a second light beam. The optical splitter is also used to transmit the first light beam to the first output optical fiber, and to transmit the second light beam to the second output optical fiber. The first output optical fiber is used to transmit the first polarization component. Therefore, when the first light beam contains light in the second polarization direction, the light in the second polarization direction cannot be transmitted in the first output optical fiber, so that the light output by the first output optical fiber is the first polarization component of the first polarization direction. The second output optical fiber is used to transmit the second polarization component. Therefore, when the second light beam contains light in the first polarization direction, the light in the first polarization direction cannot be transmitted in the second output optical fiber, so that the light output by the second output optical fiber is the second polarization component of the second polarization direction.

[0016] (2) In another possible implementation of the light splitting unit, the light splitting unit includes: a polarization beam splitting prism. The polarization beam splitting prism is a prism capable of splitting a light beam into a first polarization component and a second polarization component. The polarization beam splitting prism has a beam splitting surface inside, and the light beam incident on the polarization beam splitting prism is split into the first polarization component and the second polarization component on the beam splitting surface.

[0017] Optionally, in the case where the light splitting unit includes a polarization light splitting prism, the spectrum acquisition device further includes: a reflection unit having a reflection surface; the light splitting unit is used to transmit the first polarization component to the first calculated spectrum unit (such as the first dielectric layer in the first calculated spectrum unit), and transmit the second polarization component to the reflection surface of the reflection unit; the reflection surface is used to reflect the second polarization component to the second calculated spectrum unit (such as the second dielectric layer in the second calculated spectrum unit). Under the action of the reflection surface, the first calculated spectrum unit (such as the first dielectric layer in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second dielectric layer in the second calculated spectrum unit) can be arranged in parallel on the same side of the light splitting unit, which is conducive to the miniaturization of the spectrum acquisition device.

[0018] Optionally, the spectrum acquisition device does not include the reflection unit. In this case, the second detector array is arranged in the emission direction of the second polarization component from the polarization beam splitter prism, so that the second polarization component emitted from the polarization beam splitter prism can be directly transmitted to the second calculated spectrum unit.

[0019] Furthermore, the above-mentioned reflection unit can be realized in a variety of ways. For example, the reflection unit is a reflector having the above-mentioned reflection film; for another example, the reflection unit includes: a reflection prism, the reflection prism having the above-mentioned reflection surface; in this case, the first prism face of the polarization beam splitter prism is bonded to the second prism face of the reflection prism, so that the overall volume of the reflection unit and the beam splitter unit is small, which is conducive to the miniaturization of the spectrum acquisition device. Optionally, the first prism face is not bonded to the second prism face, and this application does not limit this.

[0020] Optionally, any spectrum acquisition device provided in the embodiments of the present application further includes: a collimating lens. The collimating lens is used to receive a light beam from a light source, and transmit the light beam to a light splitting unit after collimating the light beam; the collimation of the light beam by the collimating lens is used to reduce the divergence of the light beam, so as to facilitate the subsequent detection of light by a detector array (a first detector array and a second detector array). Optionally, the spectrum acquisition device does not include a collimating lens, and the present application does not limit this.

[0021] Optionally, in the embodiment of the present application, the incident direction of the first polarization component on the first calculated spectrum unit is parallel to the incident direction of the second polarization component on the second calculated spectrum unit. In this way, the first calculated spectrum unit and the second calculated spectrum unit can be arranged side by side on the same side of the spectroscopic unit, which is conducive to reducing the space occupied by the spectrum acquisition device and improving the integration of the spectrum acquisition device.

[0022] Optionally, the incident direction of the first polarization component on the first calculated spectrum unit is not parallel to the incident direction of the second polarization component on the second calculated spectrum unit. Instead, there is an angle between the incident direction of the first polarization component on the first calculated spectrum unit and the incident direction of the second polarization component on the second calculated spectrum unit, or the incident direction of the first polarization component on the first calculated spectrum unit is perpendicular to the incident direction of the second polarization component on the second calculated spectrum unit, which is not limited in the present application.

[0023] The spectra of polarization components acquired by the first spectrum calculation unit and the second spectrum calculation unit may be controlled by the processing unit or may not be controlled by the processing unit. Optionally, the processing unit is also used to: send a control signal to the first spectrum calculation unit (such as the first detector array in the first spectrum calculation unit) and the second spectrum calculation unit (such as the second detector array in the second spectrum calculation unit). The first spectrum calculation unit is used to calculate the spectrum of the first polarization component according to the control signal. The second spectrum calculation unit is used to calculate the spectrum of the second polarization component according to the control signal.

[0024] Optionally, the control signal is used to indicate the start time and the exposure duration; the first spectrum calculation unit is used to calculate the spectrum of the first polarization component received during the exposure duration at the start time; the second spectrum calculation unit is used to calculate the spectrum of the second polarization component received during the exposure duration at the start time. For example, the first detector array is used to detect the spatial distribution of the intensity of the first polarization component received through the first dielectric layer during the exposure duration at the start time; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity. The second detector array is used to detect the spatial distribution of the intensity of the second polarization component received through the second dielectric layer during the exposure duration at the start time; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0025] Optionally, the spectrum acquisition device provided in the embodiment of the present application further includes an optical path coupling unit, which is connected between the light source and the spectroscopic unit and is used to couple the light beam from the light source to the spectroscopic unit. When the spectrum acquisition device includes a collimating lens, the collimating lens is arranged on the optical path where the light source, the optical path coupling unit and the spectroscopic unit are located.

[0026] In a second aspect, the present application provides a spectrum acquisition method, which is performed by a spectrum acquisition device described in any design of the first aspect, and the spectrum acquisition device includes: a spectrometer, a first spectrum calculation unit, a second spectrum calculation unit, and a processing unit; the method includes: after receiving a light beam from a light source, the spectrometer divides the light beam into a first polarization component and a second polarization component with different polarization directions. Afterwards, the spectrometer transmits the first polarization component to the first spectrum calculation unit, and transmits the second polarization component to the second spectrum calculation unit, so that the first spectrum calculation unit calculates the spectrum of the first polarization component, and the second spectrum calculation unit calculates the spectrum of the second polarization component. Finally, the processing unit obtains the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

[0027] The processing unit can obtain the spectrum of the first polarization component obtained by the first calculated spectrum unit and the spectrum of the second polarization component obtained by the second calculated spectrum unit. For example, the first calculated spectrum unit transmits the calculated spectrum of the first polarization component (which can be carried in an electrical signal or an optical signal) to the processing unit, and the second calculated spectrum unit transmits the calculated spectrum of the second polarization component (which can be carried in an electrical signal or an optical signal) to the processing unit. For another example, the processing unit reads the spectrum of the first polarization component from the first calculated spectrum unit, and reads the spectrum of the second polarization component from the second calculated spectrum unit.

[0028] The processing unit can obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component. For example, the processing unit adds the spectrum of the first polarization component and the spectrum of the second polarization component to obtain the spectrum of the light beam.

[0029] Furthermore, the processing unit can also perform corresponding analysis operations based on the spectrum of the light beam, such as analyzing the composition of the substance, analyzing the concentration of the material in the liquid, etc.

[0030] Optionally, the first spectrum calculation unit acquiring the spectrum of the first polarization component and the second spectrum calculation unit acquiring the spectrum of the second polarization component may be controlled by the processing unit or may not be controlled by the processing unit.

[0031] Optionally, when the first calculated spectrum unit acquires the spectrum of the first polarization component, and the second calculated spectrum unit acquires the spectrum of the second polarization component, which can be controlled by the processing unit, the method further includes: the processing unit sends a control signal to the first calculated spectrum unit (such as the first detector array in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second detector array in the second calculated spectrum unit). The first calculated spectrum unit can calculate the spectrum of the first polarization component according to the control signal. The second calculated spectrum unit can calculate the spectrum of the second polarization component according to the control signal.

[0032] For example, the first detector array in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component according to the control signal, and the first processing module obtains the spectrum of the first polarization component according to the intensity spatial distribution. The second detector array in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component according to the control signal, and the second processing module obtains the spectrum of the second polarization component according to the intensity spatial distribution.

[0033] Optionally, the control signal is used to indicate a start time and an exposure duration; the first spectrum calculation unit may calculate a spectrum of a first polarization component received within the exposure duration at the start time; and the second spectrum calculation unit may calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0034] For example, the first detector array can detect the spatial distribution of the intensity of the first polarization component received during the exposure period and passing through the first dielectric layer at the starting time; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity; the second detector array can detect the spatial distribution of the intensity of the second polarization component received during the exposure period and passing through the second dielectric layer at the starting time; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0035] In a third aspect, the present application provides a spectrum acquisition method, which is executed by a processing unit in a spectrum acquisition device described in any design of the first aspect, and the spectrum acquisition device includes: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; the spectroscopic unit is used to receive a light beam from a light source, and divide the light beam into a first polarization component and a second polarization component, and transmit the first polarization component to the first spectrum calculation unit, and transmit the second polarization component to the second spectrum calculation unit; the first spectrum calculation unit is used to calculate the spectrum of the first polarization component; the second detector array is used to calculate the spectrum of the second polarization component; the method includes: after the processing unit obtains the spectrum of the first polarization component calculated by the first spectrum calculation unit and the spectrum of the second polarization component calculated by the second spectrum calculation unit, the processing unit obtains the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

[0036] The processing unit can obtain the spectrum of the first polarization component obtained by the first calculated spectrum unit and the spectrum of the second polarization component obtained by the second calculated spectrum unit. For example, the first calculated spectrum unit transmits the calculated spectrum of the first polarization component (which can be carried in an electrical signal or an optical signal) to the processing unit, and the second calculated spectrum unit transmits the calculated spectrum of the second polarization component (which can be carried in an electrical signal or an optical signal) to the processing unit. For another example, the processing unit reads the spectrum of the first polarization component from the first calculated spectrum unit, and reads the spectrum of the second polarization component from the second calculated spectrum unit.

[0037] The processing unit can obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component. For example, the processing unit adds the spectrum of the first polarization component and the spectrum of the second polarization component to obtain the spectrum of the light beam.

[0038] Furthermore, the processing unit can also perform corresponding analysis operations based on the spectrum of the light beam, such as analyzing the composition of the substance, analyzing the concentration of the material in the liquid, etc.

[0039] Optionally, the first spectrum calculation unit acquiring the spectrum of the first polarization component and the second spectrum calculation unit acquiring the spectrum of the second polarization component may be controlled by the processing unit or may not be controlled by the processing unit.

[0040] Optionally, when the first calculated spectrum unit acquires the spectrum of the first polarization component, and the second calculated spectrum unit acquires the spectrum of the second polarization component, which can be controlled by the processing unit, the method further includes: the processing unit sends a control signal to the first calculated spectrum unit (such as the first detector array in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second detector array in the second calculated spectrum unit). The first calculated spectrum unit can calculate the spectrum of the first polarization component according to the control signal. The second calculated spectrum unit can calculate the spectrum of the second polarization component according to the control signal.

[0041] For example, the first detector array in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component according to the control signal, and the first processing module obtains the spectrum of the first polarization component according to the intensity spatial distribution. The second detector array in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component according to the control signal, and the second processing module obtains the spectrum of the second polarization component according to the intensity spatial distribution.

[0042] Optionally, the control signal is used to indicate a start time and an exposure duration; the first spectrum calculation unit may calculate a spectrum of a first polarization component received within the exposure duration at the start time; and the second spectrum calculation unit may calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0043] For example, the first detector array can detect the spatial distribution of the intensity of the first polarization component received during the exposure period and passing through the first dielectric layer at the starting time; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity; the second detector array can detect the spatial distribution of the intensity of the second polarization component received during the exposure period and passing through the second dielectric layer at the starting time; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0044] In a fourth aspect, the present application provides a processing unit, which belongs to the spectrum acquisition device described in any design of the first aspect, and the spectrum acquisition device also includes: the spectrum acquisition device includes: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; the spectroscopic unit is used to receive a light beam from a light source, and divide the light beam into a first polarization component and a second polarization component, and transmit the first polarization component to the first spectrum calculation unit, and transmit the second polarization component to the second spectrum calculation unit; the first spectrum calculation unit is used to calculate the spectrum of the first polarization component; the second detector array is used to calculate the spectrum of the second polarization component; the processing unit includes: an acquisition module and a processing module. The acquisition module is used to acquire the spectrum of the first polarization component calculated by the first spectrum calculation unit, and the spectrum of the second polarization component calculated by the second spectrum calculation unit; the processing module is used to obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

[0045] Furthermore, the processing unit also includes an analysis module, which is used to perform corresponding analysis operations on the spectrum of the light beam processed by the processing module, such as analyzing the composition of the substance, analyzing the concentration of the material in the liquid, etc.

[0046] Optionally, the first calculated spectrum unit acquires the spectrum of the first polarization component, and the second calculated spectrum unit acquires the spectrum of the second polarization component, which may be controlled by the processing unit or not. In the case where the first calculated spectrum unit acquires the spectrum of the first polarization component, and the second calculated spectrum unit acquires the spectrum of the second polarization component, which may be controlled by the processing unit, the processing unit further includes: a sending module, which is used to send a control signal to the first calculated spectrum unit (such as the first detector array in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second detector array in the second calculated spectrum unit). The first calculated spectrum unit can calculate the spectrum of the first polarization component according to the control signal. The second calculated spectrum unit can calculate the spectrum of the second polarization component according to the control signal.

[0047] For example, the first detector array in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component according to the control signal, and the first processing module obtains the spectrum of the first polarization component according to the intensity spatial distribution. The second detector array in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component according to the control signal, and the second processing module obtains the spectrum of the second polarization component according to the intensity spatial distribution.

[0048] Optionally, the control signal is used to indicate a start time and an exposure duration; the first spectrum calculation unit may calculate a spectrum of a first polarization component received within the exposure duration at the start time; and the second spectrum calculation unit may calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0049] For example, the first detector array can detect the spatial distribution of the intensity of the first polarization component received during the exposure period and passing through the first dielectric layer at the starting time; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity; the second detector array can detect the spatial distribution of the intensity of the second polarization component received during the exposure period and passing through the second dielectric layer at the starting time; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0050] In a fifth aspect, the present application provides a processing unit, which belongs to the spectral acquisition device described in any design of the first aspect, and the spectral acquisition device also includes: the spectral acquisition device includes: a spectroscopic unit, a first calculation spectrum unit, a second calculation spectrum unit and a processing unit; the spectroscopic unit is used to receive a light beam from a light source, and divide the light beam into a first polarization component and a second polarization component, and transmit the first polarization component to the first calculation spectrum unit, and transmit the second polarization component to the second calculation spectrum unit; the first calculation spectrum unit is used to calculate the spectrum of the first polarization component; the second detector array is used to calculate the spectrum of the second polarization component; the processing unit includes: a processor and a memory, the memory stores a program, and the processor is used to execute the program stored in the memory to implement the spectral acquisition method described in any design of the third aspect.

[0051] In a sixth aspect, the present application provides a chip, comprising a programmable logic circuit and / or program instructions, which, when the chip is running, is used to implement the spectral acquisition method as described in any one of the designs in the third aspect.

[0052] In a seventh aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the spectral acquisition method as described in any one of the designs in the third aspect.

[0053] In an eighth aspect, the present application provides a computer program product comprising instructions; when the computer program product is run on a computer, the computer executes the dispersion compensation method as described in any one of the designs in the first aspect; or, when the computer program product is run on a computer, the computer executes the spectrum acquisition method as described in any one of the designs in the third aspect.

[0054] For the effects of the second to eighth aspects mentioned above, please refer to the effects of the corresponding designs in the first aspect, and this application will not elaborate on them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram of the structure of a spectrum acquisition device provided in an embodiment of the present application;

[0056] Figure 2 A schematic diagram of an application of a spectrum acquisition device provided in an embodiment of the present application;

[0057] Figure 3 A schematic diagram of another application of a spectrum acquisition device provided in an embodiment of the present application;

[0058] Figure 4 A schematic diagram of another application of a spectrum acquisition device provided in an embodiment of the present application;

[0059] Figure 5 A schematic diagram of a light splitting unit provided in an embodiment of the present application;

[0060] Figure 6 A schematic diagram of another light splitting unit provided in an embodiment of the present application;

[0061] Figure 7 A schematic diagram of another spectrum acquisition device provided in an embodiment of the present application;

[0062] Figure 8 A schematic diagram of another spectrum acquisition device provided in an embodiment of the present application;

[0063] Fig. 9 A flow chart of a spectrum acquisition method provided in an embodiment of the present application;

[0064] Fig.10 A flow chart of another spectrum acquisition method provided in an embodiment of the present application;

[0065] Fig.11 A block diagram of a processing unit provided in an embodiment of the present application;

[0066] Fig.12 A schematic diagram of the structure of a processing unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to make the principles and technical solutions of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0068] The present application relates to a spectrometer, which is a device capable of analyzing a light beam to obtain a spectrum of the light beam, wherein the spectrum includes the intensity of light of each wavelength in the light beam.

[0069] Spectrometers can be used in various fields, such as agriculture, industry, and aerospace. Spectrometers can be used in scenarios of material composition analysis. For example, a light beam is used to irradiate a material of a component to be analyzed, and then a spectrometer is used to analyze the light beam reflected by the material, the light beam transmitted by the material, or the light beam excited by the light beam to obtain the spectra of these light beams. Then, the composition of the material is analyzed based on the spectra of these light beams. Here, the use of a spectrometer for material composition analysis is taken as an example. It can be understood that spectrometers have other application scenarios, which will not be elaborated in this application.

[0070] With the development of science and technology, there are more and more types of spectrometers. For example, common spectrometers include computational spectrometers, dispersive spectrometers, and Fourier spectrometers. Among them, computational spectrometers have the characteristics of low process requirements, low preparation difficulty, low requirements for the intensity of the light beam to be analyzed, and smaller size at the same resolution compared to dispersive spectrometers; computational spectrometers have the characteristics of smaller size at the same resolution and faster speed in obtaining the spectrum of the light beam compared to Fourier spectrometers. It can be seen that the performance of computational spectrometers is higher than that of dispersive spectrometers and Fourier spectrometers.

[0071] The computational spectrometer includes: a dielectric layer, a detector array, and a processing module. The computational spectrometer is used to analyze the spectrum of a polarized light beam. The polarized light beam is transmitted to the dielectric layer, and optical reactions such as random reflection, random refraction, random scattering, and random diffraction occur under the action of various coded media in the dielectric layer.

[0072] After passing through the dielectric layer, the polarized light beam will be transmitted to the detector array, which can detect the received polarized light beam to obtain the spatial distribution of the intensity of the polarized light beam. The detector array includes multiple detectors arranged in an array, each of which can detect the intensity of the received light beam. The intensities detected by multiple detectors constitute the spatial distribution of the intensity of the polarized light beam, which is used to characterize the intensity of the light beam received at each position in the detector array.

[0073] The detector array can also transmit the intensity spatial distribution to the processing module, and the processing module can obtain the spectrum of the polarized light beam based on the intensity spatial distribution. By way of example, the processing module can pre-store a correspondence between a plurality of polarized light beam spectra and a plurality of intensity spatial distributions. After receiving the intensity spatial distribution sent by the detector array, the processing module can query the correspondence, obtain the polarized light beam spectrum corresponding to the intensity spatial distribution, and use the polarized light beam spectrum as the spectrum of the polarized light beam. By way of another example, the processing module can pre-store a method for inversely calculating the spectrum of the polarized light beam based on the intensity spatial distribution of the polarized light beam. After obtaining the intensity spatial distribution of the polarized light beam, the processing module can use the method to inversely calculate the spectrum of the polarized light beam.

[0074] However, in the application scenario of computational spectrometers, the beam that the computational spectrometer needs to analyze the spectrum is usually not a polarized beam, but an unpolarized beam with multiple polarization components. In addition, the dielectric layer usually has a dual-polarization characteristic, so the transmission conditions of different polarization components of the unpolarized beam in the dielectric layer are different, resulting in different spatial distributions of the intensity of different polarization components. In this way, the result obtained by the detector array is the sum of the spatial distribution of the intensity of the two polarization components, and the spatial distribution of the intensity of one polarization component cannot be detected. The processing module cannot determine the spectrum based on the correlation between the spatial distribution of the intensity of a certain polarization component and the spectrum.

[0075] The present application provides a spectrum acquisition device, which can analyze not only the spectrum of a polarized light beam, but also the spectrum of a non-polarized light beam, so the spectrum acquisition device has relatively low requirements for the light beam that needs to be analyzed.

[0076] For example, Figure 1 A schematic diagram of the structure of a spectrum acquisition device provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the spectrum acquisition device 10 includes: a spectroscopic unit 101, a first computational spectrum unit, a second computational spectrum unit and a processing unit 108. The first computational spectrum unit includes: a first dielectric layer 102, a first detector array 104 and a first processing module 106, and the second computational spectrometer includes: a second dielectric layer 103, a second detector array 105 and a second processing module 107.

[0077] The light splitting unit 101 is used to receive a light beam from the light source 20 and split the light beam into a first polarization component P and a second polarization component S with different polarization directions. The light splitting unit 101 may be referred to as a polarizing beam splitter (PBS).

[0078] The spectroscopic unit 101 is further used to transmit the first polarization component P to the first spectrum calculation unit and transmit the second polarization component S to the second spectrum calculation unit, so that the first spectrum calculation unit calculates the spectrum of the first polarization component P and the second spectrum calculation unit calculates the spectrum of the second polarization component S.

[0079] For example, the light splitting unit 101 is used to transmit the first polarization component P to the first medium layer 102 in the first calculated spectrum unit, and to transmit the second polarization component S to the second medium layer 103 in the second calculated spectrum unit.

[0080] The first dielectric layer 102 in the first calculated spectrum unit and the second dielectric layer 103 in the second calculated spectrum unit both have a plurality of coding media (not shown in the drawings). After the first polarization component P is transmitted to the first dielectric layer 102, it will randomly reflect, refract, scatter, diffract, and other optical reactions on the coding medium in the first dielectric layer 102 (this process can be regarded as random filtering of the first polarization component P). After the second polarization component P is transmitted to the second dielectric layer 103, it will randomly reflect, refract, scatter, diffract, and other optical reactions on the coding medium in the second dielectric layer 103 (this process can be regarded as random filtering of the second polarization component S). The embodiment of the present application does not limit the transmission conditions of the polarization component in the coding medium in the dielectric layer. The above-mentioned coding medium is sensitive to wavelength, and the transmission conditions of optical signals of different wavelengths in the first dielectric layer 102 are different, and the transmission conditions of optical signals of different wavelengths in the second dielectric layer 103 are also different.

[0081] After passing through the first dielectric layer 102, the first polarization component P is transmitted to the first detector array 104 in the first calculation spectrum unit. After passing through the second dielectric layer 103, the second polarization component S is transmitted to the second detector array 105 in the second calculation spectrum unit. The first detector array 104 is used to detect the first polarization component P passing through the first dielectric layer 102 to obtain the intensity spatial distribution of the first polarization component P; the second detector array 105 is used to detect the second polarization component S passing through the second dielectric layer 103 to obtain the intensity spatial distribution of the second polarization component S. Both the first detector array 104 and the second detector array 105 include a plurality of detectors arranged in an array, and each detector can detect the received light to obtain the intensity of the light. The intensity spatial distribution detected by each detector array includes the intensity detected by each detector in the detector array.

[0082] The first detector array 104 can transmit the intensity spatial distribution of the detected first polarization component P to the first processing module 106 in the first calculation spectrum unit, and the second detector array 105 can transmit the intensity spatial distribution of the detected second polarization component S to the second processing module 107 in the second calculation spectrum unit. The first processing module 106 can analyze the intensity spatial distribution of the first polarization component P to obtain the spectrum of the first polarization component P. The second processing module 107 can analyze the intensity spatial distribution of the second polarization component S to obtain the spectrum of the second polarization component S.

[0083] For example, the first processing module 106 is used to query the corresponding relationship between the intensity spatial distribution of the first polarization component P and the spectrum of the first polarization component P according to the intensity spatial distribution of the first polarization component P, and obtain the spectrum of the first polarization component P. The second processing module 107 is used to query the corresponding relationship between the intensity spatial distribution of the second polarization component S and the spectrum of the second polarization component S according to the intensity spatial distribution of the second polarization component S, and obtain the spectrum of the second polarization component S.

[0084] For another example, the first processing module 106 may pre-store a method for inversely calculating the spectrum of the first polarization component according to the intensity spatial distribution of the first polarization component P. After obtaining the intensity spatial distribution of the first polarization component P, the first processing module 106 may inversely calculate the spectrum of the first polarization component using this method. The second processing module 107 may pre-store a method for inversely calculating the spectrum of the first polarization component according to the intensity spatial distribution of the second polarization component S. After obtaining the intensity spatial distribution of the second polarization component S, the second processing module 107 may inversely calculate the spectrum of the first polarization component using this method.

[0085] The processing unit 108 is used to obtain the spectrum of the first polarization component P obtained by the first spectrum calculation unit and the spectrum of the second polarization component S obtained by the second spectrum calculation unit. For example, the first spectrum calculation unit transmits the spectrum of the first polarization component P calculated (which can be carried in an electrical signal or an optical signal) to the processing unit 108, and the second spectrum calculation unit transmits the spectrum of the second polarization component S calculated (which can be carried in an electrical signal or an optical signal) to the processing unit 108. Alternatively, the processing unit 108 reads the spectrum of the first polarization component P from the first spectrum calculation unit, and reads the spectrum of the second polarization component S from the second spectrum calculation unit.

[0086] The processing unit 108 is further configured to obtain the spectrum of the light beam according to the spectrum of the first polarization component P and the spectrum of the second polarization component S. For example, the processing unit 108 adds the spectrum of the first polarization component P and the spectrum of the second polarization component S to obtain the spectrum of the light beam.

[0087] Furthermore, the processing unit 108 can also be used to perform corresponding analysis operations based on the spectrum of the light beam, such as analyzing the composition of a substance, analyzing the concentration of a material in a liquid, and the like.

[0088] The processing unit 108 may be a device having the above functions, such as a microcontroller unit (MCU).

[0089] In summary, in the spectrum acquisition device provided by the present application, since the spectroscopic unit divides the light beam of the spectrum to be analyzed into two polarization components, and the first spectrum calculation unit and the second spectrum calculation unit respectively obtain the spectrum detection of the two polarization components, and then the processing unit obtains the spectrum of the light beam according to the spectra of the two polarization components. In this way, when the light beam is non-polarized light, the spectrum acquisition device can also obtain the spectrum of the light beam. In addition, the spectrum acquisition device can not only obtain the spectrum of non-polarized light, but also the spectrum of polarized light, so the spectrum acquisition device has low requirements for the light beam that needs to be analyzed.

[0090] In addition, the computational spectrum unit in the spectrum acquisition device uses the same principle as the computational spectrometer to acquire the spectrum. Therefore, compared with the dispersion type spectrometer, the spectrum acquisition device has the characteristics of low process requirements, low preparation difficulty, low requirements for the beam intensity of the spectrum to be analyzed, and smaller size at the same resolution (such as picometers (pm)); compared with the Fourier type spectrometer, the spectrum acquisition device has the characteristics of smaller size at the same resolution and faster speed of acquiring the spectrum of the light beam (such as the time length of acquiring the spectrum reaches milliseconds (ms) level).

[0091] Optionally, the first processing module 106, the second processing module 107 and the processing unit 108 are integrated. Alternatively, the first processing module 106, the second processing module 107 and the processing unit 108 are independent of each other. This embodiment of the application does not limit this.

[0092] The functions of the spectrum acquisition device provided in this application will be illustrated by four examples below.

[0093] For example, Figure 2As shown, when the light beam from the light source is non-polarized light, the non-polarized light includes light of various polarization directions. After the non-polarized light is transmitted to the light splitting unit 101, it will be divided into a first polarization component P and a second polarization component S by the light splitting unit 101. It can be understood that the polarization direction of the first polarization component P is the first polarization direction, and the polarization direction of the second polarization component S is the second polarization direction. In the non-polarized light, the light of the first polarization direction will be transmitted to the first dielectric layer 102, and the light of the second polarization direction will be transmitted to the second dielectric layer 103; in the non-polarized light, the light with polarization directions different from the first polarization direction and the second polarization direction will be decomposed into the light of the first polarization direction and the light of the second polarization direction, and the light of the first polarization direction will be transmitted to the first dielectric layer 102, and the light of the second polarization direction will be transmitted to the second dielectric layer 103. In this way, the light transmitted to the first dielectric layer 102 is all the light of the first polarization direction, and the light transmitted to the second dielectric layer 103 is all the light of the second polarization direction. The light transmitted to the first dielectric layer 102 is called the first polarization component P of the light beam incident to the spectroscopic unit 101, and the light transmitted to the second dielectric layer 103 is called the second polarization component S of the light beam. After passing through the first dielectric layer 102, the first polarization component P is transmitted to the first detector array 104, and the first detector array 104 detects the spatial distribution of the intensity of the first polarization component P, and the first processing module 106 obtains the spectrum of the first polarization component P according to the spatial distribution of the intensity; after passing through the second dielectric layer 103, the second polarization component S is transmitted to the second detector array 105, and the second detector array 105 detects the spatial distribution of the intensity of the second polarization component S, and the second processing module 107 obtains the spectrum of the second polarization component S according to the spatial distribution of the intensity. Finally, the processing unit 108 obtains the spectrum of the above-mentioned non-polarized light according to the spectrum of the first polarization component P and the spectrum of the second polarization component S.

[0094] For example, Figure 3As shown, when the light beam from the light source is polarized light, if the polarization direction of the polarized light is the first polarization direction, the polarized light will be transmitted to the first dielectric layer 102 as the first polarization component P by the spectroscopic unit 101. In addition, the second polarization component S transmitted to the second dielectric layer 103 by the spectroscopic unit 101 is zero. After passing through the first dielectric layer 102, the first polarization component P is transmitted to the first detector array 104, and the first detector array 104 detects the spatial distribution of the intensity of the first polarization component P, and the first processing module 106 obtains the spectrum of the first polarization component P according to the spatial distribution of the intensity; since the second polarization component S is zero, the spatial distribution of the intensity of the second polarization component S detected by the second detector array 105 is zero, and the intensity in the spectrum of the second polarization component S obtained by the second processing module 107 according to the spatial distribution of the intensity is all zero. Finally, the processing unit 108 obtains the spectrum of the above polarized light according to the spectrum of the first polarization component P and the spectrum of the second polarization component S. Furthermore, since the intensity in the spectrum of the second polarization component S is zero, the spectrum of the polarized light is also the spectrum of the first polarization component P.

[0095] For example, Figure 4 As shown, when the light beam from the light source is polarized light, if the polarization direction of the polarized light is the second polarization direction, the polarized light will be transmitted to the second dielectric layer 103 as the second polarization component S by the spectroscopic unit 101. In addition, the first polarization component P transmitted to the first dielectric layer 102 by the spectroscopic unit 101 is zero. After passing through the second dielectric layer 103, the second polarization component S is transmitted to the second detector array 105, and the second detector array 105 detects the intensity spatial distribution of the second polarization component S, and the second processing module 107 obtains the spectrum of the second polarization component S according to the intensity spatial distribution; since the first polarization component P is zero, the intensity spatial distribution of the first polarization component P detected by the first detector array 104 is zero, and the intensity in the spectrum of the first polarization component P obtained by the first processing module 106 according to the intensity spatial distribution is all zero. Finally, the processing unit 108 obtains the spectrum of the above polarized light according to the spectrum of the first polarization component P and the spectrum of the second polarization component S. Furthermore, since the intensity in the spectrum of the first polarization component P is zero, the spectrum of the polarized light is also the spectrum of the second polarization component S.

[0096] As another example, when the light beam from the light source includes polarized light in a first polarization direction, polarized light in a second polarization direction, and unpolarized light, the polarized light in the first polarization direction will be transmitted to the first dielectric layer 102, and the polarized light in the second polarization direction will be transmitted to the second dielectric layer 103. In the unpolarized light, the light in the first polarization direction will be transmitted to the first dielectric layer 102, and the light in the second polarization direction will be transmitted to the second dielectric layer 103; in the unpolarized light, the light in a polarization direction different from both the first polarization direction and the second polarization direction will be decomposed into the light in the first polarization direction and the light in the second polarization direction, and the light in the first polarization direction will be transmitted to the first dielectric layer 102, and the light in the second polarization direction will be transmitted to the second dielectric layer 103. In this way, the light transmitted to the first dielectric layer 102 is all the light in the first polarization direction, and the light transmitted to the second dielectric layer 103 is all the light in the second polarization direction. The light transmitted to the first dielectric layer 102 is called the first polarization component P of the light beam incident on the light splitting unit 101, and the light transmitted to the second dielectric layer 103 is called the second polarization component S of the light beam. After passing through the first dielectric layer 102, the first polarization component P is transmitted to the first detector array 104, and the first detector array 104 detects the intensity spatial distribution of the first polarization component P, and the first processing module 106 obtains the spectrum of the first polarization component P according to the intensity spatial distribution; after passing through the second dielectric layer 103, the second polarization component S is transmitted to the second detector array 105, and the second detector array 105 detects the intensity spatial distribution of the second polarization component S, and the second processing module 107 obtains the spectrum of the second polarization component S according to the intensity spatial distribution. Finally, the processing unit 108 obtains the spectrum of the above-mentioned non-polarized light according to the spectrum of the first polarization component P and the spectrum of the second polarization component S.

[0097] According to the above four examples, the spectrum acquisition device provided by the present application can not only acquire the spectrum of polarized light, but also acquire the spectrum of non-polarized light, and also acquire the spectrum of a light beam including both polarized light and non-polarized light. Therefore, the spectrum acquisition device does not limit the polarization characteristics of the input light beam.

[0098] The polarization direction of the first polarization component P in the embodiment of the present application is different from the polarization direction of the second polarization component S, and the present application does not limit the polarization directions of the first polarization component P and the second polarization component S. Optionally, the first polarization component P and the second polarization component S are orthogonal to each other, and in this case, the polarization direction of the first polarization component P is perpendicular to the polarization component of the second polarization component S. It can be understood that the first polarization component P and the second polarization component S may not be orthogonal. In addition, the first polarization component may not be represented by P, and the second polarization component may not be represented by S.

[0099] Furthermore, the above-mentioned light splitting unit 101 has multiple implementable modes.

[0100] (1) One possible implementation of the optical splitting unit 101 is as follows Figure 5 As shown, the light splitting unit 101 includes: a fiber polarization beam splitter 101 a. The fiber polarization beam splitter 101 a includes: an input fiber 1011, a first output fiber 1012, a second output fiber 1013 and a light splitter 1014.

[0101] The input optical fiber 1011 is a non-polarization-maintaining optical fiber, the first output optical fiber 1012 is a polarization-maintaining optical fiber for transmitting the first polarization component P, and the second output optical fiber 1013 is a polarization-maintaining optical fiber for transmitting the second polarization component S. One end of the input optical fiber 1011, one end of the first output optical fiber 1012, and one end of the second output optical fiber 1013 are all connected to a spectrometer, the other end of the first output optical fiber 1012 is connected to the first calculated spectrum unit (such as the first dielectric layer 102 in the first calculated spectrum unit), and the other end of the second output optical fiber 1013 is connected to the second calculated spectrum unit (such as the second dielectric layer 103 in the second calculated spectrum unit).

[0102] The input optical fiber 1011 is used to transmit the light beam from the light source to the optical splitter 1014; the optical splitter 1014 is used to split the light beam from the input optical fiber 1011 to obtain a first light beam and a second light beam. The polarization characteristics of the first light beam and the second light beam can be the same as the polarization characteristics of the light beam from the input optical fiber 1011. For example, the light beam from the input optical fiber 1011, the first light beam and the second light beam are all non-polarized light. The optical splitter 1014 is also used to transmit the first light beam to the first output optical fiber 1012, and to transmit the second light beam to the second output optical fiber 1013. The first output optical fiber 1012 is used to transmit the first polarization component P. Therefore, when the first light beam contains light in the second polarization direction, the light in the second polarization direction cannot be transmitted in the first output optical fiber 1012, so that the light output by the first output optical fiber 1012 is the first polarization component P in the first polarization direction. The second output optical fiber 1013 is used to transmit the second polarization component S. Therefore, when the second light beam contains light in the first polarization direction, the light in the first polarization direction cannot be transmitted in the second output optical fiber 1013, so that the light output by the second output optical fiber 1013 is the second polarization component S in the second polarization direction.

[0103] The polarization characteristics of the first light beam and the second light beam may also be different from the polarization characteristics of the light beam from the light source, which is not limited in the embodiments of the present application. For example, the optical splitter 1014 splits the light beam from the input optical fiber 1011 based on the polarization characteristics, and the first light beam is the first polarization component P, and the second light beam is the second polarization component S. The first polarization component P can be transmitted along the first output optical fiber 1012 to the first calculated spectrum unit (such as the first dielectric layer 102 in the first calculated spectrum unit), and the second polarization component S can be transmitted along the second output optical fiber 1013 to the second calculated spectrum unit (such as the second dielectric layer 103 in the second calculated spectrum unit).

[0104] (2) Another possible implementation of the light splitting unit 101 is as follows: Figure 6 As shown, the light splitting unit 101 includes: a polarization beam splitting prism 101b. The polarization beam splitting prism 101b is a prism capable of splitting a light beam into a first polarization component P and a second polarization component S. The polarization beam splitting prism 101b has a beam splitting surface inside, and the light beam incident on the polarization beam splitting prism 101b is split into the first polarization component P and the second polarization component S on the beam splitting surface.

[0105] Optionally, when the light splitting unit 101 includes a polarization light splitting prism 101b, Figure 7 As shown, the spectrum acquisition device 10 further includes: a reflection unit 109 having a reflection surface A; the light splitting unit 101 is used to transmit the first polarization component P to the first calculated spectrum unit (such as the first dielectric layer 102 in the first calculated spectrum unit), and transmit the second polarization component S to the reflection surface A of the reflection unit 109; the reflection surface A is used to reflect the second polarization component S to the second calculated spectrum unit (such as the second dielectric layer 103 in the second calculated spectrum unit). Under the action of the reflection surface A, the first calculated spectrum unit (such as the first dielectric layer 102 in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second dielectric layer 103 in the second calculated spectrum unit) can be arranged in parallel on the same side of the light splitting unit 104, which is conducive to the miniaturization of the spectrum acquisition device.

[0106] Optionally, the spectrum acquisition device 10 does not include the reflection unit 109. In this case, the second detector array 105 is arranged in the emission direction of the second polarization component S in the polarization splitter prism 101b, so that the second polarization component S emitted from the polarization splitter prism 101b can be directly transmitted to the second calculated spectrum unit (such as the second medium layer 103 in the second calculated spectrum unit).

[0107] Furthermore, the above-mentioned reflection unit 109 can be realized in a variety of ways. For example, the reflection unit 109 is a reflection mirror having the above-mentioned reflection film A; Figure 7As shown, the reflection unit 109 includes: a reflection prism 1091, and the reflection prism 1091 has the above-mentioned reflection surface A; in this case, the first prism surface L1 of the polarization beam splitter prism 101b is attached to the second prism surface L2 of the reflection prism 1091, so that the overall volume of the reflection unit 109 and the beam splitter unit 101 is small, which is conducive to the miniaturization of the spectrum acquisition device. Optionally, the first prism surface L1 and the second prism surface L2 are not attached, and this application does not limit this.

[0108] Optionally, any spectrum acquisition device provided in the embodiments of the present application further includes: a collimating lens. Figure 7 As an example, in the spectrum acquisition device shown in Figure 7 When the spectrum acquisition device shown in the figure further includes a collimating lens 110, the structure of the spectrum acquisition device is as follows: Figure 8 As shown. The collimating lens 110 is used to receive the light beam from the light source 20, and transmit the light beam to the spectroscopic unit 101 after collimating the light beam; the collimating lens 110 collimates the light beam to reduce the divergence of the light beam, so as to facilitate the subsequent detection of light by the detector array (the first detector array and the second detector array). Optionally, the spectrum acquisition device 10 does not include the collimating lens 110, and this application does not limit this.

[0109] Optionally, in the embodiment of the present application, the incident direction of the first polarization component P on the first calculated spectrum unit (such as the first dielectric layer 102) is parallel to the incident direction of the second polarization component S on the second calculated spectrum unit (such as the second dielectric layer 103). In this way, the first calculated spectrum unit and the second calculated spectrum unit can be arranged side by side on the same side of the spectroscopic unit 101, which is conducive to reducing the space occupied by the spectrum acquisition device 10 and improving the integration of the spectrum acquisition device 10.

[0110] Optionally, the incident direction of the first polarization component P on the calculated spectrum unit (such as the first dielectric layer 102) is not parallel to the incident direction of the second polarization component S on the calculated spectrum unit (such as the second dielectric layer 103). Instead, there is an angle between the incident direction of the first polarization component P on the calculated spectrum unit (such as the first dielectric layer 102) and the incident direction of the second polarization component S on the calculated spectrum unit (such as the second dielectric layer 103), or the incident direction of the first polarization component P on the calculated spectrum unit (such as the first dielectric layer 102) is perpendicular to the incident direction of the second polarization component S on the calculated spectrum unit (such as the second dielectric layer 103), which is not limited in the present application.

[0111] The spectra of polarization components acquired by the first spectrum calculation unit and the second spectrum calculation unit may be controlled by the processing unit 108 or may not be controlled by the processing unit 108 .

[0112] Optionally, the processing unit 108 is further configured to: send a control signal to a first spectrum calculation unit (such as a first detector array 104 in the first spectrum calculation unit) and a second spectrum calculation unit (such as a second detector array 105 in the second spectrum calculation unit). The first spectrum calculation unit is configured to calculate the spectrum of the first polarization component P according to the control signal. The second spectrum calculation unit is configured to calculate the spectrum of the second polarization component S according to the control signal.

[0113] For example, the first detector array 104 in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component P according to the control signal, and the first processing module 106 obtains the spectrum of the first polarization component P according to the intensity spatial distribution. The second detector array 105 in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component S according to the control signal, and the second processing module 107 obtains the spectrum of the second polarization component S according to the intensity spatial distribution.

[0114] Optionally, the control signal is used to indicate a start time and an exposure duration; the first spectrum calculation unit is used to calculate a spectrum of a first polarization component received within the exposure duration at the start time; and the second spectrum calculation unit is used to calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0115] For example, the first detector array 104 is used to detect the intensity spatial distribution of the first polarization component P received during the exposure time and passing through the first dielectric layer 102 at the start time; the first processing module 106 obtains the spectrum of the first polarization component P according to the intensity spatial distribution. The second detector array 105 is used to detect the intensity spatial distribution of the second polarization component S received during the exposure time and passing through the second dielectric layer 103 at the start time; the second processing module 107 obtains the spectrum of the second polarization component S according to the intensity spatial distribution.

[0116] Optionally, the control signal is not used to indicate the start time and the exposure time. In this case, the first spectrum calculation unit is used to calculate the spectrum of the first polarization component P received within a first fixed time (preset time) when the detection signal is received; the second spectrum calculation unit is used to calculate the spectrum of the second polarization component received within a second fixed time (preset time) when the detection signal is received.

[0117] For example, the first detector array 104 is used to detect the intensity spatial distribution of the first polarization component P received during the first fixed time period and passing through the first dielectric layer 102 when receiving the control signal; the first processing module 106 obtains the spectrum of the first polarization component P according to the intensity spatial distribution. The second detector array 105 is used to detect the intensity spatial distribution of the second polarization component S received during the second fixed time period and passing through the second dielectric layer 103 when receiving the control signal; the second processing module 107 obtains the spectrum of the second polarization component S according to the intensity spatial distribution.

[0118] Optionally, the spectrum of polarization components acquired by the spectrum calculation unit is not controlled by the processing unit 108, but the first spectrum calculation unit is used to periodically acquire the spectrum of the received first polarization component P; the second spectrum calculation unit is used to periodically acquire the spectrum of the received second polarization component S. The period of acquiring the spectrum by the first spectrum calculation unit is the same as or different from the period of acquiring the spectrum by the second spectrum calculation unit. In addition, the processing unit 108 is used to determine the spectrum of the light beam according to the spectrum of the first polarization component P acquired most recently by the first spectrum calculation unit and the spectrum of the second polarization component S acquired most recently by the second spectrum calculation unit.

[0119] Optionally, the spectrum acquisition device provided in the embodiment of the present application further includes an optical path coupling unit (not shown in the drawings), which is connected between the light source and the spectroscopic unit and is used to couple the light beam from the light source to the spectroscopic unit. When the spectrum acquisition device includes a collimating lens, the collimating lens is arranged on the optical path where the light source, the optical path coupling unit and the spectroscopic unit are located. For example, the optical path coupling unit may include a plurality of lenses, or the optical path coupling unit may include an optical fiber (such as an optical fiber with a high numerical aperture (NA)).

[0120] Based on any spectrum acquisition device provided in the embodiments of the present application, the embodiments of the present application also provide a spectrum acquisition method performed by the spectrum acquisition device. For example, Fig. 9 A flow chart of a spectrum acquisition device provided in an embodiment of the present application, such as Fig. 9 As shown, the method includes:

[0121] S901, a light splitting unit receives a light beam from a light source.

[0122] S902 , a light splitting unit splits the light beam into a first polarization component and a second polarization component with different polarization directions.

[0123] S903: The light splitting unit transmits the first polarization component to the first spectrum calculation unit.

[0124] S904: The light splitting unit transmits the second polarization component to the second spectrum calculation unit.

[0125] For example, Figure 1 As shown, the light splitting unit 101 can receive a light beam from the light source 20, and split the light beam into a first polarization component P and a second polarization component S with different polarization directions. The light splitting unit 101 can also transmit the first polarization component P to the first calculated spectrum unit, and transmit the second polarization component S to the second calculated spectrum unit. For example, the light splitting unit 101 is used to transmit the first polarization component P to the first medium layer 102 in the first calculated spectrum unit, and transmit the second polarization component S to the second medium layer 103 in the second calculated spectrum unit.

[0126] S905: A first spectrum calculation unit calculates a spectrum of a first polarization component.

[0127] like Figure 1 As shown, the first dielectric layer 102 in the first calculated spectrum unit and the second dielectric layer 103 in the second calculated spectrum unit both have a plurality of coding media (not shown in the drawings). After the first polarization component P is transmitted to the first dielectric layer 102, it will undergo random reflection, random refraction, random scattering, random diffraction and other optical reactions on the coding medium in the first dielectric layer 102 (this process can be regarded as random filtering of the first polarization component P). The embodiment of the present application does not limit the transmission conditions of the polarization component in the coding medium in the dielectric layer. The above-mentioned coding medium is sensitive to wavelength, and the transmission conditions of optical signals of different wavelengths in the first dielectric layer 102 are different, and the transmission conditions of optical signals of different wavelengths in the second dielectric layer 103 are also different.

[0128] After passing through the first dielectric layer 102, the first polarization component P is transmitted to the first detector array 104 in the first computational spectrum unit. The first detector array 104 is used to detect the first polarization component P passing through the first dielectric layer 102 to obtain the intensity spatial distribution of the first polarization component P.

[0129] The first detector array 104 can transmit the intensity spatial distribution of the detected first polarization component P to the first processing module 106 in the first calculated spectrum unit. The first processing module 106 can analyze the intensity spatial distribution of the first polarization component P to obtain the spectrum of the first polarization component P.

[0130] For example, the first processing module 106 can query the correspondence between the intensity spatial distribution of the first polarization component P and the spectrum of the first polarization component P according to the intensity spatial distribution of the first polarization component P, and obtain the spectrum of the first polarization component P.

[0131] For example, the first processing module 106 may pre-store a method for inversely calculating the spectrum of the first polarization component based on the intensity spatial distribution of the first polarization component P. After obtaining the intensity spatial distribution of the first polarization component P, the first processing module 106 may use this method to inversely calculate the spectrum of the first polarization component.

[0132] S906: The second spectrum calculation unit calculates the spectrum of the second polarization component.

[0133] The process of calculating the spectrum of the second polarization component by the second spectrum calculation unit may refer to the process of calculating the spectrum of the first polarization component by the first spectrum calculation unit in S905, which will not be described in detail in this embodiment of the present application.

[0134] S907: The first spectrum calculation unit sends the spectrum of the first polarization component to the processing unit.

[0135] S908. The second spectrum calculation unit sends the spectrum of the second polarization component to the processing unit.

[0136] The processing unit can obtain the spectrum of the first polarization component P obtained by the first spectrum calculation unit, and the spectrum of the second polarization component S obtained by the second spectrum calculation unit. For example, in an embodiment of the present application, the first spectrum calculation unit transmits the spectrum of the first polarization component P calculated (which can be carried in an electrical signal or an optical signal) to the processing unit, and the second spectrum calculation unit transmits the spectrum of the second polarization component S calculated (which can be carried in an electrical signal or an optical signal) to the processing unit. Optionally, the processing unit may read the spectrum of the first polarization component P from the first spectrum calculation unit, and read the spectrum of the second polarization component S from the second spectrum calculation unit.

[0137] S909: The processing unit obtains a spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

[0138] For example, the processing unit adds the spectrum of the first polarization component P and the spectrum of the second polarization component S to obtain the spectrum of the light beam.

[0139] Furthermore, after S909, the processing unit may also perform corresponding analysis operations based on the spectrum of the light beam, such as analyzing the composition of the substance, analyzing the concentration of the material in the liquid, etc.

[0140] The first spectrum calculation unit acquiring the spectrum of the first polarization component in S905 and the second spectrum calculation unit acquiring the spectrum of the second polarization component in S906 may be controlled by the processing unit or may not be controlled by the processing unit.

[0141] Optionally, in the case that the first calculated spectrum unit acquires the spectrum of the first polarization component in S905, and the second calculated spectrum unit acquires the spectrum of the second polarization component in S906 can be controlled by the processing unit, before S905 and S906, the method further includes: the processing unit sends a control signal to the first calculated spectrum unit (such as the first detector array in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second detector array in the second calculated spectrum unit). In S905, the first calculated spectrum unit can calculate the spectrum of the first polarization component according to the control signal. In S906, the second calculated spectrum unit can calculate the spectrum of the second polarization component according to the control signal.

[0142] For example, in S905, the first detector array in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component according to the control signal, and the first processing module obtains the spectrum of the first polarization component according to the intensity spatial distribution. In S906, the second detector array in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component according to the control signal, and the second processing module obtains the spectrum of the second polarization component according to the intensity spatial distribution.

[0143] Optionally, the control signal is used to indicate a start time and an exposure duration; in S905, the first spectrum calculation unit may calculate a spectrum of a first polarization component received within the exposure duration at the start time; in S906, the second spectrum calculation unit may calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0144] For example, in S905, the first detector array can detect the spatial distribution of the intensity of the first polarization component received during the exposure period and passing through the first dielectric layer at the starting time; the first processing module obtains the spectrum of the first polarization component according to the spatial distribution of the intensity; in S906, the second detector array can detect the spatial distribution of the intensity of the second polarization component received during the exposure period and passing through the second dielectric layer at the starting time; the second processing module obtains the spectrum of the second polarization component according to the spatial distribution of the intensity.

[0145] Optionally, the control signal is not used to indicate the start time and the exposure time. In this case, in S905, the first spectrum calculation unit can calculate the spectrum of the first polarization component received within a first fixed time (preset time) when the detection signal is received; in S906, the second spectrum calculation unit can calculate the spectrum of the second polarization component received within a second fixed time (preset time) when the detection signal is received.

[0146] For example, in S905, when the first detector array receives the control signal, it detects the spatial distribution of the intensity of the first polarization component received during the first fixed time period and passing through the first dielectric layer; the first processing module obtains the spectrum of the first polarization component according to the spatial distribution of the intensity. In S906, when the second detector array receives the control signal, it detects the spatial distribution of the intensity of the second polarization component received during the second fixed time period and passing through the second dielectric layer; the second processing module obtains the spectrum of the second polarization component according to the spatial distribution of the intensity.

[0147] Optionally, the spectrum of polarization component acquired by the spectrum calculation unit is not controlled by the processing unit, but the first spectrum calculation unit periodically acquires the spectrum of the received first polarization component in S905; the second spectrum calculation unit periodically acquires the spectrum of the received second polarization component in S906. The period of acquiring the spectrum by the first spectrum calculation unit is the same as or different from the period of acquiring the spectrum by the second spectrum calculation unit. In addition, the processing unit is used to determine the spectrum of the light beam according to the spectrum of the first polarization component acquired most recently by the first spectrum calculation unit and the spectrum of the second polarization component acquired most recently by the second spectrum calculation unit.

[0148] In summary, in the spectrum acquisition method provided by the present application, since the spectroscopic unit divides the light beam of the spectrum to be analyzed into two polarization components, and the first spectrum calculation unit and the second spectrum calculation unit respectively obtain the spectrum detection of the two polarization components, the processing unit obtains the spectrum of the light beam according to the spectra of the two polarization components. In this way, when the light beam is non-polarized light, the spectrum of the light beam can also be obtained. In addition, the spectrum acquisition method can not only obtain the spectrum of non-polarized light, but also the spectrum of polarized light, so the spectrum acquisition method has low requirements for the light beam that needs to be analyzed.

[0149] In addition, the computational spectral unit and the computational spectrometer adopt the same principle to acquire spectra. Therefore, compared with the dispersion type spectrometer, the spectrum acquisition device has the characteristics of low process requirements, low preparation difficulty, low requirements for the beam intensity of the spectrum to be analyzed, and smaller size at the same resolution; compared with the Fourier type spectrometer, the spectrum acquisition device has the characteristics of smaller size at the same resolution and faster speed in acquiring the spectrum of the light beam.

[0150] Based on the method performed by the above-mentioned spectrum acquisition device, an embodiment of the present application provides a spectrum acquisition method performed by a processing unit in the spectrum acquisition device. For example, Fig.10 A flowchart of another spectrum acquisition method provided in an embodiment of the present application, such as Fig.10 As shown, the method includes:

[0151] S1001: A processing unit obtains a spectrum of a first polarization component calculated by a first spectrum calculation unit and a spectrum of a second polarization component calculated by a second spectrum calculation unit.

[0152] The processing unit can obtain the spectrum of the first polarization component P obtained by the first spectrum calculation unit and the spectrum of the second polarization component S obtained by the second spectrum calculation unit.

[0153] For example, the first spectrum calculation unit transmits the calculated spectrum of the first polarization component P (which can be carried in an electrical signal or an optical signal) to the processing unit, and the second spectrum calculation unit transmits the calculated spectrum of the second polarization component S (which can be carried in an electrical signal or an optical signal) to the processing unit.

[0154] For another example, the processing unit reads the spectrum of the first polarization component P from the first spectrum calculation unit, and reads the spectrum of the second polarization component S from the second spectrum calculation unit.

[0155] S1002: A processing unit obtains a spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

[0156] The processing unit can obtain the spectrum of the light beam according to the spectrum of the first polarization component P and the spectrum of the second polarization component S. For example, the processing unit adds the spectrum of the first polarization component P and the spectrum of the second polarization component S to obtain the spectrum of the light beam.

[0157] Furthermore, after S1002, the processing unit may also perform corresponding analysis operations based on the spectrum of the light beam, for example, analyzing the composition of a substance, analyzing the concentration of a material in a liquid, and the like.

[0158] Optionally, the first spectrum calculation unit acquiring the spectrum of the first polarization component and the second spectrum calculation unit acquiring the spectrum of the second polarization component may be controlled by the processing unit or may not be controlled by the processing unit.

[0159] Optionally, in the case that the first calculated spectrum unit acquires the spectrum of the first polarization component, and the second calculated spectrum unit acquires the spectrum of the second polarization component can be controlled by the processing unit, before S1001, the method further includes: the processing unit sends a control signal to the first calculated spectrum unit (such as the first detector array in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second detector array in the second calculated spectrum unit). The first calculated spectrum unit can calculate the spectrum of the first polarization component according to the control signal. The second calculated spectrum unit can calculate the spectrum of the second polarization component according to the control signal.

[0160] For example, the first detector array in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component according to the control signal, and the first processing module obtains the spectrum of the first polarization component according to the intensity spatial distribution. The second detector array in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component according to the control signal, and the second processing module obtains the spectrum of the second polarization component according to the intensity spatial distribution.

[0161] Optionally, the control signal is used to indicate a start time and an exposure duration; the first spectrum calculation unit may calculate a spectrum of a first polarization component received within the exposure duration at the start time; and the second spectrum calculation unit may calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0162] For example, the first detector array can detect the spatial distribution of the intensity of the first polarization component received during the exposure period and passing through the first dielectric layer at the starting time; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity; the second detector array can detect the spatial distribution of the intensity of the second polarization component received during the exposure period and passing through the second dielectric layer at the starting time; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0163] Optionally, the control signal is not used to indicate the start time and the exposure time. In this case, the first spectrum calculation unit can calculate the spectrum of the first polarization component received within a first fixed time (preset time) when the detection signal is received; the second spectrum calculation unit can calculate the spectrum of the second polarization component received within a second fixed time (preset time) when the detection signal is received.

[0164] For example, when the first detector array receives the control signal, it detects the spatial distribution of the intensity of the first polarization component received during the first fixed time period and passing through the first dielectric layer; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity. When the second detector array receives the control signal, it detects the spatial distribution of the intensity of the second polarization component received during the second fixed time period and passing through the second dielectric layer; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0165] Optionally, the spectrum of polarization components acquired by the spectrum calculation unit is not controlled by the processing unit, but the first spectrum calculation unit periodically acquires the spectrum of the received first polarization component; the second spectrum calculation unit periodically acquires the spectrum of the received second polarization component. The period of acquiring the spectrum by the first spectrum calculation unit is the same as or different from the period of acquiring the spectrum by the second spectrum calculation unit. In addition, the processing unit is used to determine the spectrum of the light beam according to the spectrum of the first polarization component acquired most recently by the first spectrum calculation unit and the spectrum of the second polarization component acquired most recently by the second spectrum calculation unit.

[0166] In summary, in the spectrum acquisition method provided by the present application, since the spectroscopic unit divides the light beam of the spectrum to be analyzed into two polarization components, and the first spectrum calculation unit and the second spectrum calculation unit respectively obtain the spectrum detection of the two polarization components, the processing unit obtains the spectrum of the light beam according to the spectra of the two polarization components. In this way, when the light beam is non-polarized light, the spectrum of the light beam can also be obtained. In addition, the spectrum acquisition method can not only obtain the spectrum of non-polarized light, but also the spectrum of polarized light, so the spectrum acquisition method has low requirements for the light beam that needs to be analyzed.

[0167] In addition, the computational spectral unit and the computational spectrometer adopt the same principle to acquire spectra. Therefore, compared with the dispersion type spectrometer, the spectrum acquisition device has the characteristics of low process requirements, low preparation difficulty, low requirements for the beam intensity of the spectrum to be analyzed, and smaller size at the same resolution; compared with the Fourier type spectrometer, the spectrum acquisition device has the characteristics of smaller size at the same resolution and faster speed in acquiring the spectrum of the light beam.

[0168] Combined with the above Fig.10 , describes in detail the method performed by the processing unit provided in the embodiment of the present application. In order to implement the functions described in the above methods, the processing unit needs to include hardware and / or software modules corresponding to the execution of each function. In combination with the execution process of each method described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in combination with the embodiments, but such implementation should not be considered to exceed the scope of the embodiments of the present application.

[0169] This embodiment can divide the functional modules of the corresponding device according to the above method embodiment, for example, divide each functional module corresponding to each function, and integrate two or more functions into one processing module. The above integrated module can be implemented in the form of hardware. The division of modules in this embodiment is schematic, specifically as a possible division method of logical functions, and there can be other division methods in actual implementation.

[0170] When the functional module division method is adopted, the following will be combined Fig.11 Describe the processing unit provided in the embodiment of the present application.

[0171] For example, Fig.11 A block diagram of a processing unit provided in an embodiment of the present application, the processing unit belongs to the spectrum acquisition device (such as Figure 1 spectral acquisition device in the embodiment of the present invention). Fig.11 As shown, the processing unit includes: an acquisition module 1101 and a processing module 1102.

[0172] The acquisition module 1101 is used to acquire the spectrum of the first polarization component calculated by the first spectrum calculation unit and the spectrum of the second polarization component calculated by the second spectrum calculation unit. The processing module 1102 is used to obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

[0173] The operations performed by the acquisition module 1101 may refer to S1001 in the aforementioned embodiment, and the operations performed by the processing module 1102 may refer to S1002 in the aforementioned embodiment, which will not be described in detail in the embodiments of the present application.

[0174] Furthermore, the processing unit also includes an analysis module ( Fig.11 The analysis module is used to perform corresponding analysis operations on the spectrum of the light beam processed by the processing module 1102, for example, analyzing the composition of the substance, analyzing the concentration of the material in the liquid, etc.

[0175] Optionally, the first spectrum calculation unit obtains the spectrum of the first polarization component, and the second spectrum calculation unit obtains the spectrum of the second polarization component, which can be controlled by the processing unit or not. In the case where the first spectrum calculation unit obtains the spectrum of the first polarization component, and the second spectrum calculation unit obtains the spectrum of the second polarization component, which can be controlled by the processing unit, the processing unit further includes: a sending module ( Fig.11The sending module is used to send a control signal to the first calculated spectrum unit (such as the first detector array in the first calculated spectrum unit) and the second calculated spectrum unit (such as the second detector array in the second calculated spectrum unit). The first calculated spectrum unit can calculate the spectrum of the first polarization component according to the control signal. The second calculated spectrum unit can calculate the spectrum of the second polarization component according to the control signal.

[0176] For example, the first detector array in the first calculated spectrum unit detects the intensity spatial distribution of the first polarization component according to the control signal, and the first processing module obtains the spectrum of the first polarization component according to the intensity spatial distribution. The second detector array in the second calculated spectrum unit detects the intensity spatial distribution of the second polarization component according to the control signal, and the second processing module obtains the spectrum of the second polarization component according to the intensity spatial distribution.

[0177] Optionally, the control signal is used to indicate a start time and an exposure duration; the first spectrum calculation unit may calculate a spectrum of a first polarization component received within the exposure duration at the start time; and the second spectrum calculation unit may calculate a spectrum of a second polarization component received within the exposure duration at the start time.

[0178] For example, the first detector array can detect the spatial distribution of the intensity of the first polarization component received during the exposure period and passing through the first dielectric layer at the starting time; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity; the second detector array can detect the spatial distribution of the intensity of the second polarization component received during the exposure period and passing through the second dielectric layer at the starting time; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0179] Optionally, the control signal is not used to indicate the start time and the exposure time. In this case, the first spectrum calculation unit can calculate the spectrum of the first polarization component received within a first fixed time (preset time) when the detection signal is received; the second spectrum calculation unit can calculate the spectrum of the second polarization component received within a second fixed time (preset time) when the detection signal is received.

[0180] For example, when the first detector array receives the control signal, it detects the spatial distribution of the intensity of the first polarization component received during the first fixed time period and passing through the first dielectric layer; the first processing module obtains the spectrum of the first polarization component based on the spatial distribution of the intensity. When the second detector array receives the control signal, it detects the spatial distribution of the intensity of the second polarization component received during the second fixed time period and passing through the second dielectric layer; the second processing module obtains the spectrum of the second polarization component based on the spatial distribution of the intensity.

[0181] Optionally, the spectrum of polarization component acquired by the spectrum calculation unit is not controlled by the processing unit, but the first spectrum calculation unit periodically acquires the spectrum of the received first polarization component; the second spectrum calculation unit periodically acquires the spectrum of the received second polarization component. The period of spectrum acquisition by the first spectrum calculation unit is the same as or different from the period of spectrum acquisition by the second spectrum calculation unit. In addition, the acquisition module in the processing unit is used to acquire the spectrum of the first polarization component acquired most recently by the first spectrum calculation unit and the spectrum of the second polarization component acquired most recently by the second spectrum calculation unit; the processing module is used to determine the spectrum of the light beam based on these spectra.

[0182] In summary, in the spectrum acquisition device where the processing unit provided in the embodiment of the present application is located, the spectroscopic unit divides the light beam of the spectrum to be analyzed into two polarization components, and the first spectrum calculation unit and the second spectrum calculation unit respectively obtain the spectrum detection of the two polarization components, and then the processing unit obtains the spectrum of the light beam according to the spectra of the two polarization components. In this way, when the light beam is non-polarized light, the spectrum of the light beam can also be obtained. In addition, the spectrum acquisition device where the processing unit provided in the embodiment of the present application is located can not only obtain the spectrum of non-polarized light, but also obtain the spectrum of polarized light, so the spectrum acquisition device has low requirements for the light beam that needs to be analyzed.

[0183] In addition, the computational spectral unit and the computational spectrometer adopt the same principle to acquire spectra. Therefore, compared with the dispersion type spectrometer, the spectrum acquisition device has the characteristics of low process requirements, low preparation difficulty, low requirements for the beam intensity of the spectrum to be analyzed, and smaller size at the same resolution; compared with the Fourier type spectrometer, the spectrum acquisition device has the characteristics of smaller size at the same resolution and faster speed in acquiring the spectrum of the light beam.

[0184] Optionally, when an integrated unit is used, the processing unit provided in the embodiment of the present application includes a processing module and a storage module. The processing module is used to control and manage the actions of the device, for example, to support the device to execute the actions performed by the processing unit in S1001 to S1002. The storage module is used to support the device to execute and store program codes and data.

[0185] For example, the processing module is a processor or a controller, and the processing module can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the embodiments of the present application. Optionally, the processor is a combination that implements a computing function, such as a combination of one or more microprocessors, a combination of a digital signal processor (DSP) and a microprocessor, and the like. The storage module is a memory. The memory stores a program, and the processing module (such as a processor) is used to execute the program stored in the memory to implement the operations performed by the processing unit in the spectrum acquisition method provided in any embodiment of the present application.

[0186] Optionally, the processing unit further includes a communication module for the apparatus to communicate with other devices. For example, the communication module is a device such as a radio frequency circuit, a Bluetooth chip, etc. that interacts with other devices.

[0187] In one embodiment, when the processing module is the processor 202, the storage module is the memory 201, the communication module is the communication interface 203, and the processor 202, the memory 201 and the communication interface 203 are connected via the communication bus 204, the processing unit involved in this embodiment is as follows Fig.12 In an optional implementation, the above modules included in the processing unit are computer programs stored in the memory and are called by the processor to implement the corresponding execution functions of each module.

[0188] The present application also provides a chip, which includes a programmable logic circuit and / or program instructions; when the chip is running, it is used to implement the operations performed by the processing unit in any spectrum acquisition method provided in the present application.

[0189] The present application also provides a computer-readable storage medium, in which a computer program is stored; when the computer program is executed by a processor, the operations performed by a processing unit in any of the spectrum acquisition methods provided in the present application are implemented.

[0190] The present application also provides a computer program product comprising instructions; when the computer program product is run on a computer, the computer is enabled to execute the operations performed by the processing unit in any one of the spectrum acquisition methods provided in the present application.

[0191] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product, and the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer is a general-purpose computer, a computer network, or other programmable device. The computer instructions are stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions are transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. Optionally, the computer-readable storage medium is any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. Optionally, the available medium is a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium, or a semiconductor medium (e.g., a solid-state hard disk), etc.

[0192] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "at least one" means one or more, and "plurality" means two or more, unless otherwise expressly limited. The term "and / or" is merely a description of the association relationship of associated objects, indicating the existence of three relationships. For example, A and / or B means: A exists alone, A and B exist at the same time, and B exists alone.

[0193] Different types of embodiments such as method embodiments and device embodiments provided in the embodiments of the present application can refer to each other, and the embodiments of the present application are not limited to this.

[0194] In the corresponding embodiments provided in the present application, it should be understood that the disclosed devices, processing units, etc. can be implemented by other configuration methods. For example, the device embodiments and processing unit embodiments described above are only schematic. For example, the division of modules is only a logical function division. There can be other division methods in actual implementation, such as combining or integrating multiple modules into another system, or ignoring or not executing some features. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed is an indirect coupling or communication connection through some interfaces, devices or modules, which is electrical or other forms.

[0195] The units described as separate components may or may not be physically separated, and the components described as units may or may not be physical units, and may be located in one place or distributed on multiple devices. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0196] The above is only an optional implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A spectrum acquisition device, characterized in that: include: A spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; The light splitting unit is used to receive a light beam from a light source, and split the light beam into a first polarization component and a second polarization component with different polarization directions, transmit the first polarization component to the first calculated spectrum unit, and transmit the second polarization component to the second calculated spectrum unit; The first spectrum calculation unit is used to calculate the spectrum of the first polarization component; The second spectrum calculation unit is used to calculate the spectrum of the second polarization component; The processing unit is used to obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

2. The spectrum acquisition device according to claim 1, characterized in that: The first polarization component and the second polarization component are orthogonal to each other.

3. The spectrum acquisition device according to claim 1 or 2, characterized in that: The light splitting unit comprises: a fiber polarization beam splitter.

4. The spectrum acquisition device according to claim 1 or 2, characterized in that: The light splitting unit includes a polarization light splitting prism.

5. The spectrum acquisition device according to claim 4, characterized in that: The spectrum acquisition device further includes: a reflection unit having a reflection surface; The light splitting unit is used to transmit the first polarization component to the first spectrum calculation unit, and transmit the second polarization component to the reflection surface; The reflection surface is used to reflect the second polarization component to the second calculated spectrum unit.

6. The spectrum acquisition device according to claim 5, characterized in that: The reflection unit comprises: a reflection prism; The first prism face of the polarization beam splitter prism is in contact with the second prism face of the reflection prism.

7. The spectrum acquisition device according to any one of claims 1 to 6, characterized in that: The processing unit is further used to: send a control signal to the first calculated spectrum unit and the second calculated spectrum unit; The first spectrum calculation unit is used to calculate the spectrum of the first polarization component according to the control signal; The second spectrum calculation unit is used to calculate the spectrum of the second polarization component according to the control signal.

8. The spectrum acquisition device according to claim 7, characterized in that: The control signal is used to indicate the start time and exposure duration; The first spectrum calculation unit is used to calculate the spectrum of the first polarization component received within the exposure duration at the start time; The second spectrum calculation unit is used for calculating, at the start time, the spectrum of the second polarization component received within the exposure duration.

9. The spectrum acquisition device according to any one of claims 1 to 8, characterized in that: The spectrum acquisition device further includes: a collimating lens; The collimating lens is used to receive the light beam from the light source, and transmit the light beam to the light splitting unit after collimating the light beam; the collimation is used to reduce the divergence of the light beam.

10. The spectrum acquisition device according to any one of claims 1 to 9, characterized in that: An incident direction of the first polarization component on the first calculated spectrum unit is parallel to an incident direction of the second polarization component on the second calculated spectrum unit.

11. The spectrum acquisition device according to any one of claims 1 to 10, characterized in that: The first calculation spectrum unit includes: a first medium layer, a first detector array and a first processing module; the second calculation spectrum unit includes: a second medium layer, a second detector array and a second processing module; The light splitting unit is used to transmit the first polarization component to the first dielectric layer; the first detector array is used to detect the first polarization component passing through the first dielectric layer to obtain the intensity spatial distribution of the first polarization component; the first processing module is used to calculate the spectrum of the first polarization component according to the intensity spatial distribution of the first polarization component; The light splitting unit is used to transmit the second polarization component to the second dielectric layer; the second detector array is used to detect the second polarization component passing through the second dielectric layer to obtain the intensity spatial distribution of the second polarization component; the second processing module is used to calculate the spectrum of the second polarization component according to the intensity spatial distribution of the second polarization component; The first processing module, the second processing module and the processing unit are integrated.

12. A spectrum acquisition method, characterized in that: The method is performed by the spectrum acquisition device according to any one of claims 1 to 11, wherein the spectrum acquisition device comprises: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; the method comprises: The light splitting unit receives a light beam from a light source, and splits the light beam into a first polarization component and a second polarization component having different polarization directions, transmits the first polarization component to the first calculated spectrum unit, and transmits the second polarization component to the second calculated spectrum unit; The first spectrum calculation unit calculates the spectrum of the first polarization component; The second spectrum calculation unit calculates the spectrum of the second polarization component; The processing unit obtains the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

13. The method according to claim 12, characterized in that The method further comprises: The processing unit sends a control signal to the first calculation spectrum unit and the second calculation spectrum unit; The first spectrum calculation unit calculates the spectrum of the first polarization component, including: the first spectrum calculation unit is used to calculate the spectrum of the first polarization component according to the control signal; The second spectrum calculation unit calculates the spectrum of the second polarization component, including: the second spectrum calculation unit is used to calculate the spectrum of the second polarization component according to the control signal.

14. The method according to claim 13, characterized in that The control signal is used to indicate the start time and exposure duration; The first spectrum calculation unit is used to calculate the spectrum of the first polarization component according to the control signal, including: The first spectrum calculation unit is used to calculate the spectrum of the first polarization component received within the exposure duration at the start time; The second spectrum calculation unit is used to calculate the spectrum of the second polarization component according to the control signal, including: The second spectrum calculation unit is used for calculating, at the start time, the spectrum of the second polarization component received within the exposure duration.

15. A spectrum acquisition method, characterized in that: The method is executed by a processing unit in a spectrum acquisition device according to any one of claims 1 to 11, the spectrum acquisition device comprising: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; the spectroscopic unit is used to receive a light beam from a light source, and to divide the light beam into a first polarization component and a second polarization component, and to transmit the first polarization component to the first spectrum calculation unit, and to transmit the second polarization component to the second spectrum calculation unit; the first spectrum calculation unit is used to calculate the spectrum of the first polarization component; the second detector array is used to calculate the spectrum of the second polarization component; The method comprises: Acquire the spectrum of the first polarization component calculated by the first spectrum calculation unit, and the spectrum of the second polarization component calculated by the second spectrum calculation unit; The spectrum of the light beam is obtained according to the spectrum of the first polarization component and the spectrum of the second polarization component.

16. A processing unit, characterized in that: The processing unit belongs to the spectrum acquisition device according to any one of claims 1 to 11, and the spectrum acquisition device further includes: the spectrum acquisition device includes: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; the spectroscopic unit is used to receive a light beam from a light source, and divide the light beam into a first polarization component and a second polarization component, and transmit the first polarization component to the first spectrum calculation unit, and transmit the second polarization component to the second spectrum calculation unit; the first spectrum calculation unit is used to calculate the spectrum of the first polarization component; the second detector array is used to calculate the spectrum of the second polarization component; the processing unit includes: An acquisition module, used to acquire the spectrum of the first polarization component calculated by the first spectrum calculation unit, and the spectrum of the second polarization component calculated by the second spectrum calculation unit; A processing module is used to obtain the spectrum of the light beam according to the spectrum of the first polarization component and the spectrum of the second polarization component.

17. A processing unit, characterized in that: The processing unit belongs to the spectrum acquisition device according to any one of claims 1 to 11, and the spectrum acquisition device further includes: the spectrum acquisition device includes: a spectroscopic unit, a first spectrum calculation unit, a second spectrum calculation unit and a processing unit; the spectroscopic unit is used to receive a light beam from a light source, and divide the light beam into a first polarization component and a second polarization component, and transmit the first polarization component to the first spectrum calculation unit, and transmit the second polarization component to the second spectrum calculation unit; the first spectrum calculation unit is used to calculate the spectrum of the first polarization component; the second detector array is used to calculate the spectrum of the second polarization component; the processing unit includes: A processor and a memory, wherein the memory stores a program, and the processor is used to execute the program stored in the memory to implement the spectrum acquisition method described in claim 15.

18. A chip, characterized in that: The chip includes a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the spectrum acquisition method as claimed in claim 15.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the spectrum acquisition method according to claim 15 .

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