Spectroscopic imaging system

Abstract

The invention provides a light-splitting imaging system, and relates to the technical field of optics, the light-splitting imaging system comprises a light-splitting module and a detection device, the light-splitting module comprises a light path conduction assembly and a plurality of light-splitting modules, and the plurality of light-splitting modules are distributed on a propagation path of a light signal; the detection device is arranged on the light emitting sides of the light splitting modules and comprises a plurality of detection units which are in one-to-one correspondence with the light splitting signals. According to the invention, a plurality of light splitting modules can be adopted to separate the light signal into a plurality of light splitting signals according to different wavelengths and / or polarizations, each light splitting signal can keep the whole image and carry wavelength or polarization information at the same time, and a light signal array of a spectral dimension is expanded to a two-dimensional space. Therefore, the optical information of the spectral dimension can be obtained through one-time shooting of a plurality of detection units, image splicing processing is not needed, and the acquisition speed of the system can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a spectroscopic imaging system. Background Art

[0002] Optical information dimensions include amplitude, phase, wavelength, and polarization. The detector can only collect the number of photons and output intensity information based on the number of collected photons. It cannot distinguish information such as frequency, polarization, and phase. However, the wave information of light can better reflect the physical and chemical properties of the target object and express the specific properties of the object. Therefore, distinguishing the wavelength and polarization information of the collected photons is of great significance for identifying the physical and chemical properties of the object.

[0003] The multi-dimensional spectral imaging technology in the prior art mostly adopts multi-channel segmentation to divide the light signal incident on the camera into multiple channels, and then uses optical elements such as filters or polarizers in the microchannels to filter out redundant information to achieve the purpose of multi-dimensional optical information detection.

[0004] However, in this method, the signals collected by the microchannel need to be processed by image stitching to obtain the entire image, which increases the time for data post-processing. There are also some solutions that use prism splitting, but this solution is difficult to achieve multi-channel detection, and the image plane after prism splitting is not in the same plane, which increases the time for data post-processing. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a spectroscopic imaging system that can form a spectroscopic signal with array distribution and different wavelength information, can directly perform array imaging, and the imaging is on the same plane. The image planes of different wavelengths do not need to be stitched twice, which reduces the image processing implementation and can realize true high-speed, high-sensitivity multi-dimensional optical information imaging.

[0006] In a first aspect, the present invention provides a spectroscopic imaging system, comprising:

[0007] A light splitting module, the light splitting module comprising a light path transmission component and a plurality of light splitting modules, the light path transmission component is used to receive an incident optical signal and propagate the optical signal in at least one direction, the plurality of light splitting modules are distributed on the propagation path of the optical signal, and are used to separate the optical signal into a plurality of light splitting signals emitting light in the same direction, wherein the wavelengths and / or polarizations of the plurality of light splitting signals are different;

[0008] A detection device is arranged on the light-emitting side of the plurality of the light-splitting modules, and the detection device comprises a plurality of detection units, the plurality of the detection units correspond one-to-one to the plurality of the light-splitting signals, and are used to receive the light-splitting signals and form images.

[0009] In an optional embodiment, the optical path conduction component includes a light input module and at least one first reflection module, the light input module is used to receive the incident light signal and propagate the light signal along a first direction, the first reflection module is arranged in the light output direction of the light input module, and is used to change the propagation direction of the light signal, at least one splitter module is arranged between the light input module and the first reflection module, and at least one splitter module is also arranged in the light output direction of the first reflection module.

[0010] In an optional embodiment, there are multiple first reflection modules, and the multiple first reflection modules are distributed along the propagation direction of the optical signal, and each first reflection module is used to reflect the optical signal from the first direction to the second direction or reflect the optical signal from the second direction to the first direction, and form a plurality of parallel optical paths, wherein the first direction and the second direction are opposite, and at least one splitter module is arranged between every two adjacent first reflection modules in the first direction and / or the second direction; and / or, the first reflection module includes a roof prism, and the roof prism is arranged at one end of two adjacent optical paths, and is used to reflect the optical signal after offsetting it by a preset distance.

[0011] In an optional embodiment, a plurality of the spectroscopic modules are distributed in an array, and a plurality of the detection units are distributed in an array, each of the spectroscopic modules includes a dichroic filter, a polarization spectroscopic prism and a reflective element, the dichroic filter is arranged on the propagation path of the optical signal, and is used to reflect the optical signal of a preset wavelength and transmit the optical signal of other wavelengths, the polarization spectroscopic prism is arranged on the reflection path of the dichroic filter, and is used to transmit P light and reflect S light, and the reflective element is arranged on the reflection path of the polarization spectroscopic prism, and is used to reflect the S light in a direction parallel to the P light.

[0012] In an optional embodiment, the spectroscopic module also includes a first imaging unit and a second imaging unit, the first imaging unit is arranged on the transmission path of the polarization spectroscopic prism, and is used to receive the P light and converge to form a first spectroscopic signal, the second imaging unit is arranged on the reflection path of the reflective element, and is used to receive the S light and converge to form a second spectroscopic signal, and the first imaging unit and the second imaging unit are respectively arranged corresponding to two adjacent detection units.

[0013] In an optional embodiment, the optical path conduction component includes a light input module, at least one first reflection module and at least one second reflection module, the light input module is used to receive the incident optical signal and separate the optical signal by polarization state into P light propagating along a first direction and S light propagating along a second direction, the first reflection module is arranged in the light output direction of the P light, and is used to change the propagation direction of the P light, at least one splitter module is arranged between the light input module and the first reflection module, the second reflection module is arranged in the light output direction of the S light, and is used to change the propagation direction of the S light, and at least one splitter module is arranged between the light input module and the second reflection module.

[0014] In an optional embodiment, the light input module includes a polarization beam splitter prism, a first reflector, and a second reflector. The polarization beam splitter prism is used to transmit the P light and reflect the S light. The first reflector is arranged on the transmission path of the polarization beam splitter prism to change the propagation direction of the P light. The second reflector is arranged on the reflection path of the first reflector to reflect the P light so that the P light and the S light are emitted parallel to each other.

[0015] In an optional embodiment, a plurality of the spectroscopic modules are distributed in an array, and a plurality of the detection units are distributed in an array, and the spectroscopic module includes a dichroic filter, which is arranged on a propagation path of the S light, and is used to reflect the S light of a preset wavelength and transmit the S light of other wavelengths; or the dichroic filter is arranged on a propagation path of the P light, and is used to reflect the P light of a preset wavelength and transmit the P light of other wavelengths.

[0016] In an optional embodiment, the light splitting module further includes a first imaging unit, which is disposed on a reflection path of the dichroic filter and is configured to receive the P light or the S light and converge the light to form the light splitting signal.

[0017] In an optional embodiment, the detection device is at least one camera; and / or the spectroscopic imaging system also includes an infinite conjugate objective lens, which is arranged on the light incident side of the spectroscopic module to collect the light energy of the target object and form the collimated incident light signal.

[0018] The spectroscopic imaging system provided by the embodiment of the present invention uses an optical path conduction component to construct a propagation path of an optical signal, and distributes a plurality of spectroscopic modules on the propagation path of the optical signal, so that the optical signal can be separated into a plurality of spectroscopic signals emitting light in the same direction according to the difference in wavelength and / or polarization, and the plurality of detection units of the detection device also correspond one-to-one to the spectroscopic signals, so that the plurality of spectroscopic signals can be received and imaged. Compared with the multi-channel segmentation scheme and the overall spectroscopic scheme in the prior art, the embodiment of the present invention can use a plurality of spectroscopic modules distributed in an array to separate the optical signal into a plurality of spectroscopic signals according to the difference in wavelength and / or polarization, and each spectroscopic signal can retain the overall image while collecting the specified wavelength or polarization information of the photographed target, so that the optical signal of the spectral dimension can be expanded into a two-dimensional space and imaged into the same plane, which is convenient for laying the detection units of the detection device, so that the detection device can obtain the optical information of the spectral dimension by shooting through a plurality of detection units at one time; at the same time, the optical signal of the wavelength or polarization information can be separated into a plurality of channels, which is difficult to achieve with the current prism technology. In addition, because each optical path collects information about the entire target, there is no need for image stitching, which can greatly improve the system's acquisition speed.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a spectroscopic imaging system provided by a first embodiment of the present invention is shown;

[0022] Figure 2 Shows Figure 1 Top view of the middle splitter module;

[0023] Figure 3 Shows Figure 1 A front view of the optical signal propagation path in the splitter module;

[0024] Figure 4 Shows Figure 1 A top view of the optical signal propagation path in the splitter module;

[0025] Figure 5 for Figure 3A top view of the layout of the polarization beam splitter prism and the reflective element;

[0026] Figure 6 for Figure 3 A top view layout diagram of the first imaging unit and the second imaging unit;

[0027] Figure 7 for Figure 1 A top view of the layout of the detection device;

[0028] Figure 8 A top view of the optical signal propagation path in the optical splitting module in the second embodiment of the present invention;

[0029] Fig. 9 for Figure 8 Schematic diagram of the structure of the input optical module;

[0030] Fig.10 It is a front view of the optical signal propagation path in the optical splitter module in the second embodiment of the present invention.

[0031] icon:

[0032] 100-spectrometric imaging system; 110-spectrometric module; 130-detection device; 131-detection unit; 150-optical path transmission component; 151-light input module; 153-first reflection module; 155-second reflection module; 157-first reflector; 159-second reflector; 170-spectrometric module; 171-dichroic filter; 173-polarization spectroscopic prism; 175-reflection element; 177-first imaging unit; 179-second imaging unit; 190-infinity conjugate objective lens. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0034] As disclosed in the background technology, the multi-bit spectral imaging technology in the prior art mostly adopts a multi-porous microchannel segmentation and collection solution to divide the light signal incident on the camera into multiple channels, and then uses optical elements such as filters or polarizers in the microchannels to filter out redundant information to achieve the purpose of multi-dimensional optical information detection.

[0035] However, in this method, on the one hand, the filter element filters most of the light energy, greatly wasting the energy collected by the front-end optical system, and the sensitivity of the system is difficult to improve. Generally, long exposure is required to achieve the purpose of detection, which makes it difficult to achieve rapid detection. In other words, the prior art adopts a solution of placing an array filter in front of the detector to filter out unnecessary wavelengths and only allow the spectrum in a very narrow wavelength range to pass. This solution wastes most of the light energy, has low collection efficiency, and greatly affects the imaging efficiency and sensitivity.

[0036] On the other hand, the signals collected by the microchannel need to be processed by image stitching to obtain the entire image, which increases the time for data post-processing.

[0037] There are also some solutions that use prism splitting to avoid wasting spectral energy, but this solution is difficult to achieve multi-channel detection, and the image plane after prism splitting is not in the same plane, and the goal of sharing detectors between channels cannot be achieved. Therefore, it is necessary to additionally design detection devices at different positions for imaging and then synthesizing, which increases the complexity and cost of the system, and the imaging efficiency is also low.

[0038] At the same time, some systems filter images of different perspectives through aperture filtering in the main lens, use the characteristics of light field cameras to collect multiple perspective information of the scene at the same time, and realize snapshot polarization imaging through polarizer arrays. However, when reconstructing images, this system involves cross-microlens images. Although it can obtain rich angle information, it sacrifices spatial resolution and affects the imaging quality. In addition, the image reconstruction algorithm is complex, especially the image registration under different filtering states, which requires high computing resources and time.

[0039] In order to solve the above problems, an embodiment of the present invention provides a novel spectroscopic imaging system and a camera.

[0040] First embodiment

[0041] See also Figure 1 and Figure 2The embodiment of the present invention provides a spectroscopic imaging system 100, which can form spectroscopic signals with different wavelength information and array distribution, and can directly array image to the same plane, so that imaging can be performed once by the same device, simplifying the structure. In addition, the image planes of different wavelengths do not need to be spliced ​​twice, which reduces the image processing implementation, and can realize true high-speed, high-sensitivity multi-dimensional optical information imaging.

[0042] The spectroscopic imaging system 100 provided in an embodiment of the present invention includes a spectroscopic module 110 and a detection device 130. The spectroscopic module 110 includes an optical path transmission component 150 and multiple spectroscopic modules 170. The optical path transmission component 150 is used to receive an incident optical signal and propagate the optical signal in at least one direction. The multiple spectroscopic modules 170 are distributed on the propagation path of the optical signal, and are used to separate the optical signal into multiple spectroscopic signals that emit light in the same direction and are distributed in an array, wherein the wavelengths and / or polarizations of the multiple spectroscopic signals are different, and preferably the wavelengths and polarizations of the multiple spectroscopic signals are different; the detection device 130 is arranged on the light-emitting side of the multiple spectroscopic modules 170, and the detection device 130 includes multiple detection units 131, and the multiple detection units 131 are distributed in an array and correspond one-to-one to the multiple spectroscopic signals, and are used to receive the spectroscopic signals and form images.

[0043] See also Figure 7 The spectroscopic imaging system 100 provided in the embodiment of the present invention can use a plurality of spectroscopic modules 170 distributed in an array to separate an optical signal into a plurality of spectroscopic signals according to different wavelengths. Each spectroscopic signal can retain the overall image while carrying wavelength information, and expand the optical signal array of the spectral dimension into a two-dimensional space. Therefore, the optical information of the spectral dimension can be obtained by shooting with a plurality of detection units 131 at one time, without splicing or any image processing, which can greatly improve the acquisition speed of the system.

[0044] It should be noted that the detection device 130 can realize array imaging of multiple spectroscopic signals, wherein the multiple detection units 131 can be multiple detector arrays, or the same detector can be digitally divided into different array areas. At the same time, since each optical path collects information about the entire object being photographed, rather than only collecting local information about the object being photographed, there is no need for splicing, and no image splicing processing is required, which can greatly improve the acquisition speed of the system.

[0045] See also Figures 2 to 4The optical path transmission component 150 includes a light input module 151 and at least one first reflection module 153. The light input module 151 is used to receive the incident optical signal and propagate the optical signal along the first direction. The first reflection module 153 is arranged in the light output direction of the light input module 151 to change the propagation direction of the optical signal. At least one optical splitter module 170 is arranged between the light input module 151 and the first reflection module 153. At least one optical splitter module 170 is also arranged in the light output direction of the first reflection module 153. Among them, three optical splitter modules 170 are arranged between the light input module 151 and the first reflection module 153, and three groups of optical splitter signals with different wavelengths can be obtained. The light input module 151 can be a reflector, which can adjust the optical signal to propagate in the first direction.

[0046] See also Figure 4 , further, there are multiple first reflection modules 153, and the multiple first reflection modules 153 are distributed along the propagation direction of the optical signal. Each first reflection module 153 is used to reflect the optical signal from the first direction to the second direction or reflect the optical signal from the second direction to the first direction, and form multiple parallel optical paths, wherein the first direction is opposite to the second direction, and at least one optical splitter module 170 is arranged between each two adjacent first reflection modules 153 in the first direction and / or the second direction. Specifically, the first reflection modules 153 can be distributed on both sides of the array area of ​​the multiple optical splitter modules 170, so that the incident optical signal in the first direction is reflected by the first first reflection module 153 to the second direction, and the second first reflection module 153 reflects the optical signal in the second direction again to the first direction, and the two first reflection modules 153 alternately go back and forth, thereby forming multiple optical paths, wherein the multiple optical paths correspond to the array area of ​​the multiple optical splitter modules 170. Three optical splitter modules 170 are also arranged between two adjacent first reflection modules 153, so that three groups of optical splitter signals with different wavelengths can be obtained.

[0047] In this embodiment, the first reflection module 153 includes a roof prism, which is arranged at one end of two adjacent optical paths and is used to offset the optical signal by a preset distance and then reflect it. The roof prism can offset the optical signal by a certain distance along a third direction located in the same plane as the multiple optical paths, the third direction is perpendicular to the second direction, and the offset distance here can be determined based on the beam diameter of the optical signal and the structural layout of the system. Of course, in other preferred embodiments of the present invention, the first reflection module 153 can also be a combination of reflectors, that is, a plurality of reflectors are used to realize the function of offsetting and reflecting.

[0048] It should be noted that the multiple optical paths here are parallel to each other and are located on the same plane, and the multiple splitter modules 170 can extend from the plane toward the fourth direction, so as to realize light emission toward the fourth direction, wherein the fourth direction is the emission direction of the final split signal, and the fourth direction is perpendicular to the first direction, the second direction, and the third direction. The number of first reflection modules 153 and the number of splitter modules 170 between two adjacent first reflection modules 153 can be set according to the number of optical spectrum bands for splitting, and the number of multiple splitter modules 170 can be increased or decreased arbitrarily. In this embodiment, two first reflection modules 153 are used, and three splitter modules 170 are set in both the light incident direction and the light emitting direction of the first reflection module 153 as an example for explanation.

[0049] See also Figure 3 and Figure 5 Each optical splitting module 170 includes a dichroic filter 171, a polarization beam splitter prism 173 and a reflective element 175. The dichroic filter 171 is arranged on the propagation path of the optical signal, and is used to reflect the optical signal of a preset wavelength and transmit the optical signals of other wavelengths. The polarization beam splitter prism 173 is arranged on the reflection path of the dichroic filter 171, and is used to transmit P light and reflect S light. The reflective element 175 is arranged on the reflection path of the polarization beam splitter prism 173, and is used to reflect S light in a direction parallel to the P light. Specifically, the reflective element 175 can be a right-angle prism, and the dichroic filter 171 can be set on the propagation path of the optical signal, and the optical signal of the preset wavelength can be reflected at a 90° angle to the polarization beam splitter prism 173, while the optical signals of the remaining spectrum bands continue to propagate toward the next dichroic filter 171. Due to the characteristics of the dichroic filter 171, it will only split the light according to the spectrum band, and will not filter the light energy, so it will not cause energy waste, and each separated split light signal can be rearranged and imaged, avoiding the energy loss of the optical signal and ensuring the imaging efficiency and sensitivity. Of course, the dichroic filter 171 can also be replaced by other optical devices, which can realize the reflection of light of the specified wavelength and the transmission of light of other wavelengths; the polarization beam splitter prism 173 can also be replaced by other polarization beam splitter devices. The selected polarization beam splitter prism can split the light according to the different polarizations, and then with or without the help of other devices, the two parts of the signal with mutually perpendicular polarizations are imaged into the same plane.

[0050] It should be noted that the P light (P polarized light) mentioned in this embodiment refers to polarization splitting with a polarization direction parallel to the incident plane, and the S light (S polarized light) refers to polarization splitting with a polarization direction perpendicular to the incident direction, wherein the S polarized light can be reflected to the reflective element 175 at an angle of 90°, and then reflected at an angle of 90° by the reflective element 175 and emitted parallel to the P polarized light. Specifically, P light (Parallel polarization) is P polarized light: when the electric field vibration direction of the incident light is parallel to the incident plane, this polarization state is called P polarization. The incident plane is a plane composed of the incident light and the surface normal. When the P light encounters the interface, its electric field component is parallel to the incident plane. S light (senkrecht polarization) is S polarized light: when the electric field vibration direction of the incident light is perpendicular to the incident plane, we call this polarization state S polarization. This means that the electric field component of the S light is in the normal direction of the incident plane.

[0051] See also Figure 3 and Figure 6 Further, the light splitting module 170 also includes a first imaging unit 177 and a second imaging unit 179. The first imaging unit 177 is arranged on the transmission path of the polarization beam splitting prism 173, and is used to receive the P light and converge to form a first light splitting signal. The second imaging unit 179 is arranged on the reflection path of the reflective element 175, and is used to receive the S light and converge to form a second light splitting signal. The first imaging unit 177 and the second imaging unit 179 are respectively arranged corresponding to two adjacent detection units 131. Specifically, the first imaging unit 177 and the second imaging unit 179 can be arranged in the imaging area of ​​two adjacent detection units 131 in pairs, and the first imaging unit 177 and the second imaging unit 179 can both be lenses, which can realize the focusing imaging function, and are more conducive to the imaging of the detection unit 131.

[0052] In this embodiment, nine spectroscopic modules 170 are taken as an example for detailed description, wherein nine dichroic filters 171, polarizing spectrometers, reflective elements 175, first imaging units 177 and second imaging units 179 are provided, and two first reflective modules 153 are provided, thereby forming a three-row parallel beam structure. The process of spectral separation and polarization separation of the spectroscopic imaging system 100 provided in an embodiment of the present invention is introduced in detail below.

[0053] See also Figure 3, the incident light signal (light beam) first reaches the light input module 151, and the light input module 151 changes the propagation direction of the light beam through the reflector so that the light signal can propagate along the first direction, so that it enters the first dichroic filter 171. The first dichroic filter 171 selectively separates the light beam of the specific wavelength Δλ1, and reflects it at an angle of 90 degrees to the corresponding first polarization beam splitter prism 173. The P polarized light (polarization direction is parallel to the incident plane) is directly transmitted through the first polarization beam splitter prism 173, and the S polarized light (polarization direction is perpendicular to the incident plane) is reflected at 90 degrees and then passes through the corresponding reflective element 175, and then is emitted parallel to the P light. After the P light passes through the corresponding first imaging unit 177, it is imaged onto the detection unit 131 (P light) corresponding to the detector; after the S light passes through the second imaging unit 179, it is imaged onto the detection unit 131 (S light) corresponding to the detector, which can be seen from Figures 5 to 7 .

[0054] Please continue to see Figure 3 , the light transmitted through the first dichroic filter 171 continues to propagate, the second dichroic filter 171 further separates the remaining light beam, extracts the light signal of the specific wavelength Δλ2, and reflects it to the second polarization beam splitter prism 173 at an angle of 90 degrees, the P polarized light is directly transmitted, and the S polarized light is reflected at 90 degrees and passes through the corresponding reflective element 175, and then is emitted parallel to the P light. After the P light passes through the first imaging unit 177, it is imaged on the detection unit 131 (P light) corresponding to the detector; after the S light passes through the second imaging unit 179, it is imaged on the detection unit 131 (S light) corresponding to the detector, which can be seen in Figures 5 to 7 .

[0055] Please continue to see Figure 3 , the remaining light beam continues to propagate and enters the third dichroic filter 171. The third dichroic filter 171 further separates the remaining light beam, extracts the energy of the specific wavelength Δλ3, and reflects it at an angle of 90 degrees to the third polarization beam splitter prism 173. The P polarized light is directly transmitted, and the S polarized light is reflected at 90 degrees and passes through the corresponding reflective element 175, and then is emitted parallel to the P light. After the P light passes through the first imaging unit 177, it is imaged on the detection unit 131 (P light) corresponding to the detector; after the S light passes through the second imaging unit 179, it is imaged on the detection unit 131 (S light) corresponding to the detector, which can be seen in Figures 5 to 7 .

[0056] See also Figure 3 and Figure 4 , the light beam can continue to propagate through the next dichroic filter 171, or it can be deflected by a prism for a certain distance and then be turned back; this structure can be extended or shortened arbitrarily according to the number of spectrum bands required for light splitting. The optical component for turning back can be a roof prism or a combination of reflectors.

[0057] In this example, after the light beam is separated by the third dichroic filter 171, the light signal of the remaining spectrum enters the first reflection module 153, that is, it is reflected by the roof prism and translated a certain distance before returning. The size of the offset depends on the diameter of the light beam and the structural layout of the system.

[0058] The roof prism returns the light beam to the fourth, fifth and sixth dichroic filters 171, and separates the spectral bands into Δλ4, Δλ5 and Δλ6 spectral signals respectively and reflects them at an angle of 90°. After the light signals of the reflected bands pass through the fourth, fifth and sixth polarization splitting prisms 173 respectively, the P polarized light is directly transmitted, and the S polarized light is respectively reflected at 90° by the corresponding reflective elements 175 and then emitted parallel to the P light. The emitted P polarized light is imaged by the corresponding first imaging unit 177 and then incident on the detection unit 131 of the detector. Similarly, the S polarized light is imaged by the second imaging unit 179 and then detected and imaged by the detection unit 131 of the detector. See Figures 5 to 7 .

[0059] The optical signal of the remaining spectrum band passes through the second reflection module again, that is, the second roof prism, and then turns back after radial translation for a certain distance; the turned back optical signal passes through the seventh, eighth and ninth dichroic filters 171, and the spectra are separated into Δλ7, Δλ8, Δλ9 spectral signals respectively, and they are reflected at an angle of 90°. After the optical signals of the reflected bands pass through the seventh, eighth and ninth polarization splitter prisms 173 respectively, the P polarized light is directly transmitted, and the S polarized light is reflected at 90° to the corresponding reflection elements 175 respectively, and emerges parallel to the P light. The emergent P polarized light passes through the corresponding first imaging unit 177 respectively, and is incident on the detection unit 131 of the detector. Similarly, the S polarized light is detected by the detection unit 131 of the detector after being imaged by the second imaging unit 179, as can be seen from FIG. Figures 5 to 7 .

[0060] The detection device 130 may be a single camera or a camera system composed of multiple cameras, and the specific setting may be selected according to actual conditions.

[0061] Please continue to see Figure 1In this embodiment, the spectroscopic imaging system 100 also includes an infinite conjugate objective lens 190, which is arranged on the light incident side of the spectroscopic module 110, and is used to collect the light energy of the target object and form a collimated incident light signal. Specifically, the infinite conjugate objective lens (Infinity-Corrected Objective) is a modern objective lens design. The objective lens of this design is different from the traditional finite conjugate objective lens, and it can produce parallel light beams. The collimated incident light signal refers to a signal in which the light beam remains parallel during the propagation process after being processed by the infinite conjugate objective lens 190. The infinite conjugate objective lens 190 can complete the collection of light energy from the target object and image it to infinity, and the collimated light signal collected by the objective lens can enter the spectroscopic module 110, and the spectroscopic module 110 can arrange light signals of different wavelengths and polarizations according to a certain array. The array-arranged light beams are imaged onto the array detection unit 131 of the detector, completing one shot and obtaining multiple spectrum bands and image acquisition of different polarization states.

[0062] It should be noted that a modular design is adopted in this embodiment, wherein the infinite conjugate objective lens 190, each component in the spectroscopic module 110, and the detection device 130 are all modularly designed to facilitate assembly, disassembly, replacement, and upgrading, wherein the detection device 130 can be a detector, which can be digitally divided into different areas distributed in an array to form a detection unit 131, or can directly use multiple detector arrays to form multiple detection units 131. In addition, each optical element used in this embodiment can be a cut separate optical component or an integrated optical element. In addition, this modular design can be expanded and optimized according to actual needs, and the collection of optical signals of more bands and polarization states can be achieved by increasing or reducing the number of filters and imaging units. And the spectroscopic module 110 can be applied to application scenarios such as multi-spectral imaging, hyperspectral imaging, and fluorescence imaging.

[0063] In summary, the spectroscopic imaging system 100 provided in the embodiment of the present invention adopts the incident module and multiple first reflection modules 153 in the optical path conduction component 150 to construct the propagation path of the optical signal, and distributes multiple spectroscopic modules 170 in an array on the propagation path of the optical signal, so that the optical signal can be separated into multiple spectroscopic signals that emit light in the same direction and are distributed in an array according to different wavelengths, and the multiple detection units 131 of the detection device 130 are also distributed in an array and correspond one-to-one with the spectroscopic signals, so that multiple spectroscopic signals can be received and array imaging can be performed. Compared with the multi-channel segmentation scheme and the overall spectroscopic scheme in the prior art, the embodiment of the present invention can use a plurality of spectroscopic modules 170 distributed in an array to separate the optical signal into a plurality of spectroscopic signals according to different wavelengths. Each spectroscopic signal can retain the overall image while collecting the specified wavelength information of the photographed target, so that the optical signal of the spectral dimension is expanded into a two-dimensional space and imaged to the same plane, which is convenient for laying the detection unit 131 of the detection device 130. Therefore, the optical information of the spectral dimension can be obtained by shooting with a plurality of detection units 131 at a time. Because each optical path collects the information of the entire photographed target respectively, rather than only collecting the local information of the photographed target, there is no need for image processing, which can greatly improve the acquisition speed of the system. At the same time, multiple dichroic filters 171 are used for sequential spectroscopic, which only realizes spectroscopic according to the spectrum band, but does not filter the light energy, so it will not cause energy waste, and each separated spectroscopic signal can be rearranged and imaged, avoiding the energy loss of the optical signal and ensuring the imaging efficiency and sensitivity.

[0064] Second embodiment

[0065] See also Figures 8 to 10 This embodiment provides a spectroscopic imaging system 100, whose basic structure, principle and technical effects are the same as those of the first embodiment. For the sake of brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding contents in the first embodiment.

[0066] In this embodiment, the optical path transmission component 150 includes a light input module 151, at least one first reflection module 153 and at least one second reflection module 155. The light input module 151 is used to receive an incident optical signal and separate the optical signal into P light and S light that are parallel to each other by polarization state. The first reflection module 153 is arranged in the light output direction of the P light to change the propagation direction of the P light. At least one light splitting module 170 is arranged between the light input module 151 and the first reflection module 153. The second reflection module 155 is arranged in the light output direction of the S light to change the propagation direction of the S light. At least one light splitting module 170 is arranged between the light input module 151 and the second reflection module 155. Specifically, there can be two first reflection modules 153 and two second reflection modules 155, and both are roof prisms. At the same time, there can be 18 light splitting modules 170, and they form two 3×3 arrays. The basic light splitting principle can refer to the first embodiment.

[0067] In this embodiment, the light input module 151 includes a polarization beam splitter prism 173, a first reflector 157, and a second reflector 159. The polarization beam splitter prism 173 is used to transmit P light and reflect S light. The first reflector 157 is arranged on the transmission path of the polarization beam splitter prism 173 to change the propagation direction of the P light. The second reflector 159 is arranged on the reflection path of the first reflector 157 to reflect the P light, so that the P light and the S light can be emitted in parallel. Among them, the first reflector 157 can be a roof prism, and the second reflector 159 can be an incident reflector that can adjust the propagation direction of the optical signal. Specifically, the incident light signal is first separated into S-polarized light and P-polarized light by the polarization splitter prism 173. The S-polarized light can directly enter the splitter module 170 for splitting arrangement, and the P-polarized light can be emitted at intervals parallel to the S-polarized light after combined reflection by the first reflector 157 and the second reflector 159, and also pass through the splitter module 170 for splitting arrangement. This ensures that multiple splitter modules 170 are also in an array arrangement state.

[0068] In this embodiment, the light splitting module 170 includes a dichroic filter 171 and a first imaging unit 177. The dichroic filter 171 is arranged on the propagation path of the S light or the P light, and is used to reflect the S light or the P light of a preset wavelength and transmit the S light or the P light of the remaining wavelengths. The first imaging unit 177 is arranged on the reflection path of the dichroic filter 171, and is used to receive the P light or the S light and converge it to form a light splitting signal.

[0069] It should be noted that in this embodiment, the polarization state of the incident light signal is first separated, and then the signals of different bands are separated and arranged through a prism. Specifically, the incident light signal is restricted to enter the polarization beam splitter prism 173, wherein the P polarized light is directly transmitted and the S polarized light is reflected at 90°. After the S polarized light passes through a series of dichroic filters 171 and the first reflection module 153, it is arranged in a two-dimensional spatial array. The P polarized light that directly passes through the polarization beam splitter prism 173 passes through the first reflector 157 and is then spatially separated and arranged from the S polarized light. Similarly, the S polarized light passes through a series of dichroic filters 171 and the second reflection module 155 and is arranged in a two-dimensional spatial array.

[0070] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0071] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0072] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A spectroscopic imaging system, characterized in that: include: A light splitting module (110), the light splitting module (110) comprising an optical path transmission component (150) and a plurality of light splitting modules (170), the optical path transmission component (150) being used to receive an incident optical signal and propagate the optical signal in at least one direction, the plurality of light splitting modules (170) being distributed on a propagation path of the optical signal and being used to separate the optical signal into a plurality of split optical signals that emit light in the same direction, wherein the wavelengths and / or polarizations of the plurality of split optical signals are different; A detection device (130), wherein the detection device (130) is arranged on the light output side of the plurality of the splitting modules (170), and the detection device (130) comprises a plurality of detection units (131), wherein the plurality of detection units (131) correspond one-to-one to the plurality of the splitting signals, and are used to receive the splitting signals and form images.

2. The spectroscopic imaging system according to claim 1, characterized in that: The optical path transmission component (150) comprises a light input module (151) and at least one first reflection module (153); the light input module (151) is used to receive the incident light signal and propagate the light signal along a first direction; the first reflection module (153) is arranged in the light output direction of the light input module (151) and is used to change the propagation direction of the light signal; at least one light splitting module (170) is arranged between the light input module (151) and the first reflection module (153); and at least one light splitting module (170) is also arranged in the light output direction of the first reflection module (153).

3. The spectroscopic imaging system according to claim 2, characterized in that: There are a plurality of first reflection modules (153), the plurality of first reflection modules (153) being distributed along the propagation direction of the optical signal, each first reflection module (153) being used to reflect the optical signal from the first direction to the second direction or to reflect the optical signal from the second direction to the first direction, and forming a plurality of parallel optical paths, wherein the first direction is opposite to the second direction, and at least one optical splitting module (170) is provided between every two adjacent first reflection modules (153) in the first direction and / or the second direction; and / or The first reflection module (153) comprises a roof prism, which is arranged at one end of two adjacent optical paths and is used to reflect the optical signal after offsetting it by a preset distance.

4. The spectroscopic imaging system according to claim 2, characterized in that: A plurality of the light splitting modules (170) are distributed in an array, and a plurality of the detection units (131) are distributed in an array, each of the light splitting modules (170) comprises a dichroic filter (171), a polarization beam splitting prism (173) and a reflective element (175), the dichroic filter (171) being arranged on a propagation path of the optical signal, and being used to reflect the optical signal of a preset wavelength and transmit the optical signal of other wavelengths, the polarization beam splitting prism (173) being arranged on a reflective path of the dichroic filter (171), and being used to transmit P light and reflect S light, and the reflective element (175) being arranged on a reflective path of the polarization beam splitting prism (173), and being used to reflect the S light in a direction parallel to the P light.

5. The spectroscopic imaging system according to claim 4, characterized in that: The spectroscopic module (170) further comprises a first imaging unit (177) and a second imaging unit (179); the first imaging unit (177) is arranged on the transmission path of the polarization spectroscopic prism (173) for receiving the P light and converging it to form a first spectroscopic signal; the second imaging unit (179) is arranged on the reflection path of the reflection element (175) for receiving the S light and converging it to form a second spectroscopic signal; the first imaging unit (177) and the second imaging unit (179) are respectively arranged corresponding to two adjacent detection units (131).

6. The spectroscopic imaging system according to claim 1, characterized in that: The optical path transmission component (150) comprises a light input module (151), at least one first reflection module (153) and at least one second reflection module (155); the light input module (151) is used to receive the incident light signal and separate the light signal into P light and S light according to the polarization state; the first reflection module (153) is arranged in the light output direction of the P light and is used to change the propagation direction of the P light; at least one light splitting module (170) is arranged between the light input module (151) and the first reflection module (153); the second reflection module (155) is arranged in the light output direction of the S light and is used to change the propagation direction of the S light; at least one light splitting module (170) is arranged between the light input module (151) and the second reflection module (155).

7. The spectroscopic imaging system according to claim 6, characterized in that: The light input module (151) comprises a polarization beam splitter prism (173), a first reflector (157) and a second reflector (159); the polarization beam splitter prism (173) is used to transmit the P light and reflect the S light; the first reflector (157) is arranged on the transmission path of the polarization beam splitter prism (173) and is used to change the propagation direction of the P light; the second reflector (159) is arranged on the reflection path of the first reflector (157) and is used to reflect the P light so that the P light and the S light are emitted in parallel with each other.

8. The spectroscopic imaging system according to claim 6, characterized in that: A plurality of the spectroscopic modules (170) are distributed in an array, and a plurality of the detection units (131) are distributed in an array, each of the spectroscopic modules (170) comprises a dichroic filter (171), and the dichroic filter (171) is arranged on a propagation path of the S light, and is used to reflect the S light of a preset wavelength and transmit the S light of other wavelengths; or the dichroic filter (171) is arranged on a propagation path of the P light, and is used to reflect the P light of a preset wavelength and transmit the P light of other wavelengths.

9. The spectroscopic imaging system according to claim 8, characterized in that: The light splitting module (170) further comprises a first imaging unit (177), which is arranged on the reflection path of the dichroic filter (171) and is used to receive the P light or the S light and converge to form the light splitting signal.

10. The spectroscopic imaging system according to claim 1, characterized in that: The detection device (130) is at least one camera; and / or, The spectroscopic imaging system further comprises an infinite conjugate objective lens (190), which is arranged on the light incident side of the spectroscopic module (110) and is used to collect light energy of the target object and form the collimated incident light signal.

Images