Spectrum detection probe and spectrograph

Abstract

The utility model discloses a spectrum detection probe and a spectrograph, relates to spectrum detection analysis technical field, said spectrum detection probe includes the shell, wherein the shell is provided with light transmission port, and the shell is internally provided with incident light channel and receiving light channel, said spectrum detection probe also includes incident light subassembly and receiving light subassembly, the incident light subassembly is provided with light transmission port, and the receiving light subassembly is provided with light transmission port and receiving light channel. The incident light assembly is arranged in the incident light channel, the receiving light assembly is arranged in the receiving light channel, and the incident light channel and the receiving light channel are both communicated with the light transmitting opening. The incident light can pass through the light transmitting opening from the incident light assembly, the detection light can enter the light receiving assembly through the light transmitting opening, and an included angle exists between the light propagation direction of the incident light channel and the light propagation direction of the light receiving channel. The spectrum detection probe and the spectrograph provided by the utility model are used for measuring spectrum information of deposits, and have the advantage of high utilization rate of optical signals.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of spectrum detection and analysis technology, more particularly to a spectrum detection probe and a spectrometer. BACKGROUND

[0002] Spectrum detection and analysis technology is an analysis method based on optical principles, which obtains information about the chemical composition and physical properties of a substance by measuring its absorption or reflection of light at different wavelengths.

[0003] Currently, spectrum detection and analysis of accumulated substances (such as soil, fermented grains, and grains) usually involves a spectrum detection probe, which typically uses a large-size multi-strand quartz optical fiber to transmit light generated by a light source (such as a halogen lamp or a high-power LED) directly to the measurement location inside the accumulated substance, and irradiate the surface of the measured object with a large divergence angle. Part of the reflected light signal returns to the optical fiber, which transmits the received reflected light to the spectrometer, and the spectrometer completes the detection and analysis of the accumulated substance.

[0004] However, this method has low light signal coupling efficiency (only a small amount of light signal can effectively reach the measured object), low light signal collection efficiency (only part of the reflected light signal can be captured and transmitted by the optical fiber), and other problems, which further leads to low utilization rate of light signal, thereby reducing the accuracy of the detection and analysis of the accumulated substance.

[0005] Therefore, designing a spectrum detection probe that can be directly inserted into or in contact with the accumulated substance (soil, fermented grains, and grains) and significantly improve the utilization rate of light signal, as well as a spectrometer based on the output light signal of the probe to realize the analysis of the composition of the substance, has become an important research direction in this field. SUMMARY

[0006] The utility model aims to solve one of the technical problems in the related art to some extent. To this end, the utility model provides a spectrum detection probe and a spectrometer, which can be directly inserted into or in contact with the accumulated substance and perform spectrum detection on the accumulated substance, having the advantages of insertion type and high light signal utilization rate.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions in the first aspect:

[0008] A spectral detection probe, comprising a shell, wherein a light transmission port is formed on the shell, and an incident light channel and a received light channel are formed in the shell, the spectral detection probe further comprises an incident light assembly and a received light assembly, the incident light assembly is arranged in the incident light channel, the received light assembly is arranged in the received light channel, the incident light channel and the received light channel are communicated with the light transmission port, so that the incident light can pass through the light transmission port from the incident light assembly, and the detection light can pass through the light transmission port to enter the received light assembly, and an included angle exists between the light propagation direction of the incident light channel and the light propagation direction of the received light channel.

[0009] Optionally, the received light assembly comprises a lens group and a photodetector, the lens group is arranged between the photodetector and the light transmission port, and the lens group is used for guiding the detection light entering from the light transmission port to the photodetector.

[0010] Optionally, the lens group comprises two plano-convex lenses arranged in opposite directions.

[0011] Optionally, the spectral detection probe further comprises a signal transmission wire, the signal transmission wire is arranged in the shell, and one end of the signal transmission wire is connected with the output end of the photodetector.

[0012] Optionally, the incident light assembly comprises a light signal transmission optical device and a collimation device, the collimation device is arranged between the output end of the light signal transmission optical device and the light transmission port, and the collimation device is used for collimating the light signal transmitted by the light signal transmission optical device.

[0013] Optionally, the collimation device comprises a fixing member and a collimation lens, and the fixing member fixes the collimation lens on the side of the output end of the light signal transmission optical device.

[0014] Optionally, the included angle between the light propagation direction of the incident light channel and the light propagation direction of the received light channel is 30°-60°.

[0015] Optionally, the spectral detection probe further comprises a light transmission protection plate, the light transmission protection plate is arranged on the light transmission port, an included angle exists between the incident light channel and the light transmission protection plate, and the received light channel is perpendicular to the light transmission protection plate.

[0016] Further, the utility model discloses a spectrum detection probe, and the spectrum detection probe comprises a housing, a light source, a spectrum modulator and a circuit module.

[0017] Optionally, the spectrum modulator comprises a plurality of active tunable spectrum units, and the output of a preceding active tunable spectrum unit is connected to the input of a subsequent active tunable spectrum unit, for changing the energy distribution of the light emitted by the light source on the spectrum.

[0018] The spectrum detection probe comprises a housing, a light source, a spectrum modulator and a circuit module.

[0019] The spectrum detection probe comprises a housing, a light source, a spectrum modulator and a circuit module.

[0020] The spectral detection probe provided by the utility model is internally provided with an incident light channel and a receiving light channel.

[0021] The features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation mode or means of the utility model will be fully manifested in combination with the drawings, but is not a limitation on the technical scheme of the utility model. In addition, the features, elements and components appearing in each of the following text and drawings are multiple, and are marked with different symbols or numbers for the convenience of representation, but all represent the same or similar structure or function parts. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be further described in combination with the drawings:

[0023] Figure 1 It is structural diagram of spectral detection probe in an embodiment of the utility model.

[0024] Figure 2 It is structural schematic diagram of spectrometer in an embodiment of the utility model.

[0025] Figure 3 It is schematic diagram of circuit module in an embodiment of the utility model.

[0026] Figure 4 It is structural schematic diagram of spectral modulator in an embodiment of the utility model.

[0027] Figure 5 It is structural schematic diagram of spectral modulator in another embodiment of the utility model.

[0028] EXPLANATION OF REFERENCE NUMERALS

[0029] Wherein, 100, incident light channel; 101, optical signal transmission optical device; 102, collimating device; 103, incident light assembly; 200, receiving light channel; 201, lens group; 202, photodetector; 203, receiving light assembly; 300, signal transmission wire; 400, shell; 401, light-transmitting protective plate; 500, light source; 600, spectrum modulator; 700, spectrum detection probe; 800, object to be detected; 900, circuit module; 901, driving module; 902, signal processing module; 601, active tunable spectrum unit; 6011, phase modulator. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the embodiments, it is intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] In this specification, "one embodiment" or "an embodiment" or "example" or "exemplary" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0032] In related spectrum detection and analysis technology, the spectrum detection and analysis of the accumulated matter (such as soil, fermented grains, grains, etc.) usually uses a spectrum detection probe to transmit light signals to the object to be detected and receive the reflected detection light of the object to be detected. However, during the transmission of the light signal from the light source to the object to be detected, due to the large divergence angle of the light source, the low reflection or transmission efficiency of the optical element, etc., only a small amount of light signal can effectively irradiate the object to be detected. In addition, during the process of the detection light returning from the object to be detected to the detector, due to the large divergence angle of the reflected light or the unreasonable design of the receiving light path, the photodetector can only receive a small amount of light signal. This low light signal coupling efficiency and low collection efficiency directly leads to the decrease of the utilization rate of the light signal, thereby reducing the accuracy of the accumulated matter detection and analysis.

[0033] In view of this, as a first aspect of the present invention, a spectral detection probe 700 is provided. The spectral detection probe 700 includes a housing 400, wherein a light-transmitting port is formed on the housing 400, and an incident light channel 100 and a receiving light channel 200 are formed inside the housing 400. The spectral detection probe 700 also includes an incident light component 103 and a receiving light component 203. The incident light component 103 is disposed inside the incident light channel 100, and the receiving light component 203 is disposed inside the receiving light channel 200. Both the incident light channel 100 and the receiving light channel 200 are connected to the light-transmitting port, so that incident light can pass through the light-transmitting port from the incident light component 103, and detection light can enter the receiving light component 203 through the light-transmitting port. There is an angle between the light propagation direction of the incident light channel 100 and the light propagation direction of the receiving light channel 200.

[0034] like Figure 1 The spectral detection probe 700 shown internally includes an incident light channel 100 and a receiving light channel 200. An incident light assembly 103 is disposed within the incident light channel 100, and a receiving light assembly 203 is disposed within the receiving light channel 200. The incident light channel 100 concentrates the light signal emitted by the incident light assembly 103 toward a light-transmitting protective plate 401 on the housing 400, allowing it to directly illuminate the object 800 located on the other side of the light-transmitting protective plate 401. The detection light reflected from the object 800 is then transmitted through the light-transmitting protective plate 401 to the receiving light channel 200, and finally converges at the receiving end of the photodetector 202 in the receiving light assembly 203. Because there is an angle between the incident light channel 100 and the receiving light channel 200, interference between the incident light emitted by the incident light channel 100 and the detection light received by the receiving light channel 200 is effectively reduced. The light-transmitting protective plate 401 not only protects the optical components inside the spectral detection probe 700, but its high transparency also provides an ideal optical channel for light signal transmission. The angle design between the incident light channel 100 and the light-transmitting protective plate 401 further optimizes the illumination efficiency of the incident light, allowing more incident light to directly act on the object to be detected 800. The design of the receiving light channel 200 perpendicular to the light-transmitting protective plate 401 maximizes the collection efficiency of the detection light. This structural design significantly improves the utilization rate of the light signal throughout the optical path transmission, while enhancing the accuracy of the spectrometer in detecting and analyzing accumulated materials.

[0035] The following is in conjunction with the appendix Figure 1 The internal structure design of the spectral detection probe 700 is described in detail. As an optional implementation, the light receiving assembly 203 includes a lens group 201 and a photodetector 202. The lens group 201 is disposed between the photodetector 202 and the light-transmitting port, and is used to guide the detection light entering from the light-transmitting port to the photodetector 202.

[0036] The lens group 201 can optimize the light path through the combination and design of multiple lenses, and focus the detection light reflected by the object to be detected 800 to the receiving end of the photodetector 202. It needs to be particularly pointed out that the number of lenses in the lens group 201 is not specifically limited, and can be 2, 3, or 4. Figure 1 An embodiment of a lens group 201 composed of two lenses is given to realize light focusing. Again, it needs to be particularly pointed out that the combination of lenses in the lens group 201 is not specifically limited, and as an optional implementation, Figure 1 A lens group 201 composed of two convex lenses arranged opposite to each other is given, which realizes light convergence while improving the utilization rate of optical signals. After the divergent detection light is converged by the first plano-convex lens, the second plano-convex lens further acts on the converged light, and the light is concentrated towards the photodetector 202 again, and the guided light is received by the photodetector 202.

[0037] After the photodetector 202 converts the optical signal into an electrical signal, the electrical signal is output by the signal transmission wire 300 located inside the shell 400 of the spectral detection probe 700, as shown in Figure 1 One end of the signal transmission wire 300 is connected to the output end of the photodetector 202.

[0038] The internal structure of the spectral detection probe 700 also includes an incident light assembly 103 arranged in the incident light channel 100. As an optional implementation, the incident light assembly 103 includes an optical signal transmission optical device 101 and a collimating device 102, and the collimating device 102 is arranged between the output end of the optical signal transmission optical device 101 and the light transmission port. The collimating device 102 is used to collimate the light signal transmitted by the optical signal transmission optical device 101.

[0039] The type of lens in the collimating device 102 is not specifically limited, as long as it can collimate the divergent light emitted by the optical signal transmission optical device 101. The lens type can be a collimating lens, a graded-index self-focusing lens, or a lens for controlling the light beam. The optical signal transmission optical device 101 can be a single-mode optical fiber.

[0040] As an optional implementation, the collimating device 102 includes a fixing member and a collimating lens, and the fixing member fixes the collimating lens on the output side of the optical signal transmission optical device 101.

[0041] To further improve the utilization of the optical signal in the optical spectrum detection probe 700, as an optional embodiment, the included angle between the light propagation direction of the incident light channel 100 and the light propagation direction of the receiving light channel 200 of the optical spectrum detection probe 700 is 30°-60°. The setting of the included angle effectively reduces the interference between the incident light emitted by the incident light channel 100 and the detection light received by the receiving light channel 200. In actual application, the angle of the included angle is not specifically limited, as long as the interference between the incident light and the detection light can be reduced, and at the same time, in order to facilitate production operation, the angle can be set to 45°.

[0042] The optical spectrum detection probe 700 further comprises a light-transmitting protective plate 401, the light-transmitting protective plate 401 is arranged at the light-transmitting port, and there is an included angle between the incident light channel 100 and the light-transmitting protective plate 401, and the receiving light channel 200 is perpendicular to the light-transmitting protective plate 401, as shown in Figure 1 It should be particularly pointed out that the light-transmitting protective plate 401 is not specifically limited, as long as it can meet the high-transmittance characteristic, and the light-transmitting protective plate 401 can adopt a glass window.

[0043] The light-transmitting protective plate 401 not only protects the optical elements inside the optical spectrum detection probe 700, but also provides an ideal optical channel for the transmission of the optical signal due to the high-transmittance characteristic. The design of the included angle between the incident light channel 100 and the light-transmitting protective plate 401 further optimizes the irradiation efficiency of the incident light, so that more incident light directly acts on the object to be detected 800, and the design that the receiving light channel 200 is perpendicular to the light-transmitting protective plate 401 maximizes the collection efficiency of the detection light.

[0044] As a second aspect of the utility model, a kind of optical spectrometer is provided, and the optical spectrometer includes light source 500, spectrum modulator 600 and circuit module 900, characterized in that, the optical spectrometer further includes the optical spectrum detection probe 700 provided in the first aspect, the output of circuit module 900 is connected with light source 500 and spectrum modulator 600, for driving light source 500 and spectrum modulator 600;The input of circuit module 900 is connected with optical spectrum detection probe 700, for receiving the signal transmitted by optical spectrum detection probe 700 and outputting the spectral information of object to be detected 800.

[0045] Figure 2The utility model provides a spectrograph structure schematic diagram, and the propagation path of spectrograph light signal and electric signal in spectrograph is marked in detail in the drawing. Circuit module 900 sends electric signal to light source 500 and optical spectrum modulator 600 simultaneously, drives light source 500 to emit light and drives optical spectrum modulator 600 to start work, and the energy distribution of light signal sent by light source 500 is re -modulated after optical spectrum modulator 600, and the modulated light signal is transmitted to spectroscopic detection probe 700 through light signal transmission optical device 101. Spectroscopic detection probe 700 transmits the modulated light signal to the object 800 to be detected, and receives the light signal reflected by the object 800 to be detected, and after the reflected light signal is converted into electric signal by photoelectric detector 202 in spectroscopic detection probe 700, the electric signal is transmitted to circuit module 900 through signal transmission wire 300. Circuit module 900 processes electric signal and calculates the optical spectrum information of the object 800 to be detected. The type of light source 500 of spectrograph can be super radiant light emitting diode or other wide spectrum light source 500.

[0046] Need to be specially pointed out, circuit modulation module includes drive module 901 and signal processing module 902, as Figure 3 The drive module 901 is used to drive light source 500 and optical spectrum modulator 600, and the signal processing module 902 is connected with the signal transmission wire 300 of spectroscopic detection probe 700, and the optical spectrum information of the object 800 to be detected is obtained according to the electric signal transmitted by the signal transmission wire 300.

[0047] The optical spectrum modulator 600 is arranged between light source 500 and spectroscopic detection probe 700, and is used to change the energy distribution of light emitted by light source 500 on the spectrum. As an optional implementation manner, as Figure 4 The optical spectrum modulator 600 includes multistage active tunable spectrum unit 601, and the output of the front stage active tunable spectrum unit 601 is connected with the input of the rear stage active tunable spectrum unit 601.

[0048] Figure 5The spectrum modulator 600 is composed of four active tunable spectrum units 601. The first active tunable spectrum unit 601 is an asymmetric Mach-Zehnder interferometer, and the interference arms of the Mach-Zehnder interferometer are provided with phase modulators 6011; the second to fourth active tunable spectrum units 601 are micro-ring resonators, and the three micro-ring resonators have different ring lengths and are provided with phase modulators 6011. The optical signal is transmitted to the two interference arms of the asymmetric Mach-Zehnder interferometer through an optical waveguide, the phase difference / optical path difference of the two interference arms of the Mach-Zehnder interferometer is changed by changing the parameters of the phase modulators 6011 on the interference arms, so that the two optical signals on the interference arms of the Mach-Zehnder interferometer interfere at the optical waveguide, and the control of the intensity of the optical signal is realized; the optical signal processed by the Mach-Zehnder interferometer enters the micro-ring structure, and the micro-ring selects the wavelength of the input optical signal and couples the optical signal of a specific wavelength to the micro-ring. Through the synergistic effect of the two, flexible tuning and control of multiple parameters (such as wavelength, intensity, etc.) of the optical signal can be realized.

[0049] The spectrum modulator 600 can be a structure of a cascaded Mach-Zehnder interferometer or a cascaded micro-ring in addition to the embodiment. Figure 5 The spectrum modulator 600 can be a structure of a cascaded Mach-Zehnder interferometer or a cascaded micro-ring in addition to the embodiment.

[0050] The spectrum detection probe 700 and the spectrometer provided by the utility model have the advantages that the incident light channel 100 and the receiving light channel 200 are arranged in the spectrum detection probe 700, the incident light assembly 103 is arranged in the incident light channel 100, and the receiving light assembly 203 is arranged in the receiving light channel 200. The incident light channel 100 can concentrate the light signal emitted by the incident light assembly 103 towards the light-transmitting protective plate 401 on the shell 400 and transmit the light signal through the light-transmitting protective plate 401 to directly irradiate the object to be detected 800 located on the other side of the light-transmitting protective plate 401. The detection light reflected by the object to be detected 800 is transmitted to the receiving light channel 200 again through the light-transmitting protective plate 401 and finally converges to the receiving end of the photodetector 202 in the receiving light assembly 203. Since there is an included angle between the incident light channel 100 and the receiving light channel 200, the interference between the incident light emitted by the incident light channel 100 and the detection light received by the receiving light channel 200 is effectively reduced. The light-transmitting protective plate 401 not only protects the optical elements in the spectrum detection probe 700, but also provides an ideal optical channel for the transmission of the light signal due to the high-transmittance characteristic. The included angle design of the incident light channel 100 and the light-transmitting protective plate 401 further optimizes the irradiation efficiency of the incident light, so that more incident light directly acts on the object to be detected 800. The design that the receiving light channel 200 is perpendicular to the light-transmitting protective plate 401 maximizes the collection efficiency of the detection light. The structural design significantly improves the utilization rate of the light signal in the whole optical path transmission and enhances the accuracy of the spectrometer in the detection and analysis of the accumulated material.

[0051] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this, and the skilled in the art should understand that the present application includes but is not limited to the content described in the drawings and the above specific implementation. Any modification not deviating from the function and structural principle of the present application will be included in the scope of the claims.

Claims

1. A spectroscopic detection probe, the spectroscopic detection probe (700) comprising a housing (400), characterized in that, The shell (400) is provided with a light-transmitting port, and the shell (400) is provided with an incident light channel (100) and a received light channel (200), the spectral detection probe (700) further comprises an incident light assembly (103) and a received light assembly (203), the incident light assembly (103) is arranged in the incident light channel (100), the received light assembly (203) is arranged in the received light channel (200), the incident light channel (100) and the received light channel (200) are communicated with the light-transmitting port, so that the incident light can pass through the light-transmitting port from the incident light assembly (103), and the detection light can pass through the light-transmitting port to enter the received light assembly (203), and there is an included angle between the light propagation direction of the incident light channel (100) and the light propagation direction of the received light channel (200).

2. The spectroscopic detection probe of claim 1, wherein, The received light assembly (203) comprises a lens group (201) and a photodetector (202), the lens group (201) is arranged between the photodetector (202) and the light-transmitting port, and the lens group (201) is used for guiding the detection light entering from the light-transmitting port to the photodetector (202).

3. The spectroscopic detection probe of claim 2, wherein, The lens group (201) comprises two flat-convex lenses arranged in opposite directions.

4. The spectroscopic detection probe of claim 2, wherein, The spectral detection probe (700) further comprises a signal transmission wire (300), the signal transmission wire (300) is arranged in the shell (400), and one end of the signal transmission wire (300) is connected with the output end of the photodetector (202).

5. The spectroscopic detection probe of claim 1, wherein, The incident light assembly (103) comprises a light signal transmission optical device (101) and a collimating device (102), the collimating device (102) is arranged between the output end of the light signal transmission optical device (101) and the light-transmitting port, and the collimating device (102) is used for collimating the light signal transmitted by the light signal transmission optical device (101).

6. The spectroscopic detection probe of claim 5, wherein, The collimating device (102) comprises a fixing member and a collimating lens, and the fixing member fixes the collimating lens on the output end side of the light signal transmission optical device (101).

7. The spectroscopic detection probe of claim 1, wherein, The included angle between the light propagation direction of the incident light channel (100) and the light propagation direction of the received light channel (200) is 30°-60°.

8. The spectroscopic detection probe of claim 7, wherein, The spectral detection probe (700) further comprises a light-transmitting protection plate (401), the light-transmitting protection plate (401) is arranged at the light-transmitting port, there is an included angle between the incident light channel (100) and the light-transmitting protection plate (401), and the received light channel (200) is perpendicular to the light-transmitting protection plate (401).

9. A spectrometer comprising a light source (500), a spectral modulator (600), and a circuit module (900), characterized in that, The spectrometer further comprises the spectral detection probe (700) according to any one of claims 1 to 8, the output ends of the circuit modules (900) are connected with the light source (500) and the spectral modulator (600) and are used for driving the light source (500) and the spectral modulator (600); and the input ends of the circuit modules (900) are connected with the spectral detection probe (700) and are used for receiving signals transmitted by the spectral detection probe (700) and outputting spectral information of the object (800) to be detected.

10. The optical spectrometer of claim 9, wherein, The spectral modulator (600) comprises a plurality of active tunable spectral units (601), and the output of a front-stage active tunable spectral unit (601) is connected with the input of a rear-stage active tunable spectral unit (601) and is used for changing the energy distribution of light emitted by the light source (500) on the spectrum.

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