Light splitting module and light splitting imaging system

Abstract

The utility model provides a light splitting module and a light splitting imaging system, and relates to the technical field of optics, the light splitting module comprises a light path conduction assembly and a plurality of light splitting modules, the plurality of light splitting modules are distributed on a propagation path of a light signal and are used for separating the light signal into a plurality of light splitting signals emitting light towards the same direction, and the plurality of light splitting signals emit light towards the same direction. Wherein the wavelengths and / or polarizations of the plurality of spectral signals are different. According to the utility model, the plurality of light splitting modules can be adopted to split the light signals 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 the light signal array of the spectrum dimension is expanded to a two-dimensional space. Therefore, the optical information of the spectral dimension can be obtained through one-time shooting, image splicing processing is not needed, and the acquisition speed of the system can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical technology field, specifically, relate to a light splitting module and light splitting imaging system. BACKGROUND

[0002] Optical information dimension includes amplitude, phase, wavelength, polarization, the probe can only gather photon quantity, according to the intensity information of the photon quantity collected, cannot distinguish frequency, polarization, phase etc.

[0003] The prior art multi-position spectral imaging technology is mostly segmented by multi-channel, divides the light signal incident in front of the camera into multiple channels, then uses optical elements such as optical filter or polarizer in the microchannel to filter redundant information to achieve the purpose of multi-dimensional optical information detection.

[0004] But in this way, the signal collected by the microchannel needs to be processed by image stitching to get the whole image, which increases the time of data post-processing. Utility model content

[0005] Therefore, the purpose of the utility model is to provide a light splitting module and light splitting imaging system, which can form light splitting signals with different wavelength information and array distribution, can directly array imaging, and the image planes of different wavelengths do not need to be spliced twice, reducing image processing and realizing real high-speed and high-sensitivity multi-dimensional optical information imaging.

[0006] In the first aspect, the utility model provides a light splitting module, including optical path transmission assembly and multiple light splitting modules, the optical path transmission assembly is used for receiving incident light signal and propagates the light signal along at least one direction, multiple light splitting modules are distributed on the propagation path of the light signal, and are used for separating the light signal into multiple light splitting signals that emit light in the same direction, wherein the wavelength and / or polarization of multiple light splitting signals are different.

[0007] In an optional embodiment, the light path conducting assembly comprises an incoming light module and at least one first reflecting module, the incoming light module is configured to receive the incoming light signal and propagate the light signal in a first direction, the first reflecting module is arranged in the light emitting direction of the incoming light module and configured to change the propagation direction of the light signal, at least one of the light splitting modules is arranged between the incoming light module and the first reflecting module, and at least one of the light splitting modules is arranged in the light emitting direction of the first reflecting module.

[0008] In an optional embodiment, the first reflecting module is a plurality of first reflecting modules, the plurality of first reflecting modules are arranged along the propagation direction of the light signal, each of the first reflecting modules is configured to reflect the light signal from the first direction to a second direction or from the second direction to the first direction, and form a plurality of parallel light paths, wherein the first direction and the second direction are opposite, and at least one of the light splitting modules is arranged between each two adjacent first reflecting modules in the first direction and / or the second direction; and / or, the roof prism is arranged at one end of two adjacent light paths and configured to reflect the light signal after being offset by a preset distance.

[0009] In an optional embodiment, the plurality of light splitting modules are arranged in an array, each of the light splitting modules comprises a dichroic filter, a polarization splitting prism and a reflecting element, the dichroic filter is arranged in the propagation path of the light signal and configured to reflect the light signal of a preset wavelength and transmit the light signal of the remaining wavelengths, the polarization splitting prism is arranged in the reflection path of the dichroic filter and configured to transmit P light and reflect S light, and the reflecting element is arranged in the reflection path of the polarization splitting prism and configured to reflect the S light in a direction parallel to the P light.

[0010] In an optional embodiment, the light splitting module further comprises a first imaging unit and a second imaging unit, the first imaging unit is arranged in the transmission path of the polarization splitting prism and configured to receive the P light and converge to form a first split light signal, and the second imaging unit is arranged in the reflection path of the reflecting element and configured to receive the S light and converge to form a second split light signal.

[0011] In an optional embodiment, the light path conducting assembly comprises an incoming light module, at least one first reflecting module and at least one second reflecting module, the incoming light module is configured to receive the incident light signal and separate the light signal into P light propagating in a first direction and S light propagating in a second direction, the first reflecting module is arranged in the P light outgoing direction and configured to change the propagation direction of the P light, at least one of the light splitting modules is arranged between the incoming light module and the first reflecting module, the second reflecting module is arranged in the S light outgoing direction and configured to change the propagation direction of the S light, at least one of the light splitting modules is arranged between the incoming light module and the second reflecting module.

[0012] In an optional embodiment, the incoming light module comprises a polarization splitting prism, a first reflecting mirror and a second reflecting mirror, the polarization splitting prism is configured to transmit the P light and reflect the S light, the first reflecting mirror is arranged in the transmission path of the polarization splitting prism and configured to change the propagation direction of the P light, the second reflecting mirror is arranged in the reflection path of the first reflecting mirror and configured to reflect the P light so that the P light and the S light are parallel to each other.

[0013] In an optional embodiment, a plurality of the light splitting modules are arranged in an array, each of the light splitting modules comprises a dichroic filter, the dichroic filter is arranged in the propagation path of the S light and configured to reflect the S light of a preset wavelength and transmit the S light of the remaining wavelengths; or the dichroic filter is arranged in the propagation path of the P light and configured to reflect the P light of a preset wavelength and transmit the P light of the remaining wavelengths.

[0014] In an optional embodiment, the light splitting module further comprises a first imaging unit, the first imaging unit is arranged in the reflection path of the dichroic filter and configured to receive the P light or the S light and converge to form the light splitting signal.

[0015] In another aspect, the utility model embodiment provides a kind of imaging system, comprising detection device and as described before light splitting module, the detection device is arranged in the light outgoing side of multiple light splitting modules, and the detection device comprises multiple detection units, multiple detection units and multiple light splitting signals one-to-one, for receiving the light splitting signal and imaging.

[0016] In an optional embodiment, the detection device is at least one camera;And / or, multiple detection units are arranged in an array;And / or, the light splitting imaging system further comprises an infinite conjugate objective, the infinite conjugate objective is arranged in the light incoming side of the light splitting module, for collecting the light energy of target object, and forms collimated incident light signal.

[0017] The beam splitting module and beam splitting imaging system provided in this embodiment of the invention employ an optical path transmission component to construct the propagation path of the optical signal, and distribute multiple beam splitting modules in an array along the propagation path of the optical signal. This allows the optical signal to be separated into multiple beam splitting signals emitting light in the same direction according to different wavelengths and / or polarizations. Compared with existing multi-channel segmentation and overall beam splitting schemes, this embodiment of the invention can use multiple beam splitting modules to separate the optical signal into multiple beam splitting signals according to different wavelengths and / or polarizations. Each beam splitting signal can retain the overall image while acquiring the specified wavelength or polarization information of the target object. Thus, the spectral dimension of the optical signal can be unfolded into two-dimensional space and imaged onto the same plane, facilitating the deployment of detection units in the detection device. Therefore, the detection device can obtain spectral dimension optical information by capturing images simultaneously through multiple detection units. Simultaneously, it can separate the optical signal with wavelength or polarization information into multiple channels, which is difficult to achieve with current prism technology. Furthermore, because each optical path separately acquires information about the entire target object, rather than just a localized portion, image stitching is unnecessary, significantly improving the system's acquisition speed.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of the spectroscopic imaging system provided in the first embodiment of this utility model is shown;

[0021] Figure 2 It shows Figure 1 Top view of the center-splitter module;

[0022] Figure 3 It shows Figure 1 A front view of the optical signal propagation path in a center-splitter module;

[0023] Figure 4 It shows Figure 1 A top view of the optical signal propagation path in a center-splitter module;

[0024] Figure 5 for Figure 3 Top view of the layout of the intermediate polarization beam splitter and reflecting elements;

[0025] Figure 6 for Figure 3 the top layout view of the first imaging unit and the second imaging unit in the embodiment of the utility model;

[0026] Figure 7 for Figure 1 the top layout view of the detection device in the embodiment of the utility model;

[0027] Figure 8 the top view of the light signal propagation path in the light splitting module in the second embodiment of the utility model;

[0028] Figure 9 for Figure 8 the structural schematic view of the light-in module in the embodiment of the utility model;

[0029] Figure 10 the front view of the light signal propagation path in the light splitting module in the second embodiment of the utility model.

[0030] icon:

[0031] 100-splitting imaging system; 110-splitting module; 130-detection device; 131-detection unit; 150-optical path conduction assembly; 151-light-in module; 153-first reflection module; 155-second reflection module; 157-first reflection mirror; 159-second reflection mirror; 170-splitting module; 171-dichroic filter; 173-polarization splitting prism; 175-reflective element; 177-first imaging unit; 179-second imaging unit; 190-infinite conjugate objective lens. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0033] As disclosed in the background art, the multi-bit spectral imaging technology in the prior art is mostly a scheme of multi-hole micro-channel segmentation collection, which divides the light signal incident in front of the camera into multiple channels, and then uses optical elements such as filters or polarizers in the micro-channel to filter redundant information to achieve the purpose of multi-dimensional optical information detection.

[0034] However, in this way, on the one hand, the filter element filters most of the light energy, greatly wasting the energy collected by the front optical system, and the sensitivity of the system is difficult to improve, and long exposure is generally needed to achieve detection, which makes it difficult to achieve rapid detection. That is, the prior art is to place an array filter in front of the detector to filter out unnecessary wavelengths, and only allow the narrow wavelength range of the spectrum to be collected to pass through. This scheme wastes most of the light energy, has low collection efficiency, and greatly affects the imaging efficiency and sensitivity.

[0035] On the other hand, the signal collected by the micro-channel needs to be processed by image stitching before the whole image can be obtained, which increases the data post-processing time.

[0036] There are also some schemes that use prism light splitting to avoid the waste of spectral energy, but this scheme is difficult to implement multi-channel detection, and the image plane after prism light splitting is not in the same plane, so the channels cannot achieve the goal of sharing the detector, and therefore additional imaging devices at different positions need to be designed for imaging, and then synthesized to improve the system complexity and cost, and the imaging efficiency is also low.

[0037] Meanwhile, there are also some aperture filtering in the main lens, respectively filtering different angle images, using the characteristics of light field camera to collect multiple angle information of the scene at the same time, and using a polarizer array to achieve snapshot polarization imaging. However, the system involves cross-micro-lens image in image reconstruction, although it can obtain rich angle information, but the spatial resolution is sacrificed, which 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.

[0038] In order to solve the above problems, the embodiments of the present application provide a novel light splitting imaging system and camera.

[0039] First embodiment

[0040] Reference Figure 1 and Figure 2The embodiment of the utility model provides a kind of spectroscopic imaging system 100, it can form spectroscopic signal with different wavelength information and array distribution, it can be directly arrayed to the same plane, to be able to be imaged once by same device, simplify structure.Different wavelength image plane does not need to be spliced second time, reduces image processing realization, can realize the high-speed, high sensitivity of real multi-dimensional optical information imaging.

[0041] The embodiment of the utility model provides spectroscopic imaging system 100, including spectroscopic module 110 and detection device 130, spectroscopic module 110 includes light path transmission component 150 and multiple spectroscopic modules 170, light path transmission component 150 is used to receive incident optical signal and the propagation of optical signal along at least one direction, multiple spectroscopic modules 170 are distributed on the propagation path of optical signal, for separating optical signal into multiple array distribution spectroscopic signals in the same direction, wherein the wavelength and / or polarization of multiple spectroscopic signals are different, preferably the wavelength and polarization of multiple spectroscopic signals are not all same;Detection device 130 is arranged at the light exit side of multiple spectroscopic modules 170, and detection device 130 includes multiple detection units 131, multiple detection units 131 array distribution and correspond one by one with multiple spectroscopic signals, for receiving spectroscopic signal and imaging.

[0042] Referring to Figure 7 The embodiment of the utility model provides spectroscopic imaging system 100, can adopt multiple spectroscopic modules 170 of array distribution and separate optical signal into multiple spectroscopic signals according to the difference of wavelength, each spectroscopic signal can retain whole image with wavelength information, and the optical signal of spectral dimension is arrayed to two-dimensional space, so that the optical information of spectral dimension can be obtained by multiple detection units 131 once shooting, without splicing, without any image processing, can greatly improve the acquisition speed of system.

[0043] It should be noted that detection device 130 can realize the array imaging of multiple spectroscopic signals, wherein detection device 130 can be camera, for example, multiple detection units 131 can be multiple detector arrays, or different array regions are formed by digital segmentation in same detector.Meanwhile, since each light path respectively collects the information of whole photographed target, not only the local information of photographed target, so without splicing, without any image splicing processing, can greatly improve the acquisition speed of system.

[0044] Referring to Figures 2 to 4The light path conducting assembly 150 comprises an incoming light module 151 and at least one first reflecting module 153, the incoming light module 151 is used for receiving the incident light signal and propagating the light signal in a first direction, the first reflecting module 153 is arranged in the light emitting direction of the incoming light module 151 and is used for changing the propagation direction of the light signal, at least one light splitting module 170 is arranged between the incoming light module 151 and the first reflecting module 153, and at least one light splitting module 170 is also arranged in the light emitting direction of the first reflecting module 153. Wherein, three light splitting modules 170 are arranged between the incoming light module 151 and the first reflecting module 153, and three groups of light signals of different wavelengths can be obtained. The incoming light module 151 can be a mirror, which can adjust the light signal to propagate in the first direction.

[0045] For reference Figure 4 Further, the first reflecting module 153 is multiple, the multiple first reflecting modules 153 are distributed along the propagation direction of the light signal, each first reflecting module 153 is used for reflecting the light signal from the first direction to the second direction or reflecting the light signal from the second direction to the first direction, and forms multiple parallel light paths, wherein the first direction and the second direction are opposite, and at least one light splitting module 170 is arranged between every two adjacent first reflecting modules 153 in the first direction and / or the second direction. Specifically, the first reflecting module 153 can be distributed on both sides of the array region of the multiple light splitting modules 170, so that the incident light signal of the first direction is reflected by the first first reflecting module 153 to the second direction, and the second first reflecting module 153 reflects the light signal of the second direction to the first direction again, and alternately back and forth, thereby forming multiple light paths, wherein the multiple light paths correspond to the array region of the multiple light splitting modules 170. Similarly, three light splitting modules 170 are arranged between the adjacent two first reflecting modules 153, so that three groups of light signals of different wavelengths can be obtained.

[0046] In the embodiment, the first reflecting module 153 comprises a roof prism, the roof prism is arranged at one end of the adjacent two light paths and is used for reflecting the light signal after being offset by a preset distance. Wherein, the roof prism can offset the light signal by a certain distance along a third direction which is in the same plane as the multiple light paths, the third direction is perpendicular to the second direction, and the offset distance can be determined according to the beam diameter of the light signal and the structure layout of the system. Of course, in other preferred embodiments of the utility model, the first reflecting module 153 can also be a combination of mirrors, that is, a plurality of mirrors are used to realize the function of reflecting after offset.

[0047] It should be noted that the plurality of light paths are parallel to each other and located in the same plane, and the plurality of light splitting modules 170 can extend from the plane towards the fourth direction, thereby realizing light emission towards the fourth direction, wherein the fourth direction is the emission direction of the final light splitting 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 light splitting modules 170 between adjacent two first reflection modules 153 can be set according to the number of optical spectral bands of light splitting, and the number of the plurality of light splitting modules 170 can be increased or decreased arbitrarily. In the embodiment, the first reflection module 153 is two, and 3 light splitting modules 170 are arranged in the light incident direction and the light emission direction of the first reflection module 153.

[0048] Referring to Figure 3 and Figure 5 Each light splitting module 170 includes a dichroic filter 171, a polarization light splitting prism 173, and a reflecting element 175. The dichroic filter 171 is arranged on the propagation path of the light signal and is used to reflect the light signal of a predetermined wavelength and transmit the light signal of the remaining wavelength. The polarization light splitting 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 reflecting element 175 is arranged on the reflection path of the polarization light splitting prism 173 and is used to reflect S light along a direction parallel to P light. Specifically, the reflecting element 175 can be a right-angle prism, and the dichroic filter 171 can be arranged on the propagation path of the light signal. The light signal of a predetermined wavelength can be reflected by 90° to the polarization light splitting prism 173, and the light signal of the remaining spectral band continues to propagate towards the next dichroic filter 171. Due to the characteristics of the dichroic filter 171, it only realizes light splitting according to the spectral band, and does not filter light energy, so as not to cause energy waste. Each separated light splitting signal can be rearranged and imaged, avoiding energy loss of the light signal, and ensuring imaging efficiency and sensitivity. Of course, the dichroic filter 171 can also be replaced by other optical devices, which can realize reflection of light of a specified wavelength and transmission of light of other wavelengths. The polarization light splitting prism 173 can also be replaced by other polarization light splitting devices. The selected polarization light splitting prism can split light according to the polarization, and then image the two signals with perpendicular polarizations into the same plane with or without the aid of other devices.

[0049] It should be noted that the P light (P polarized light) mentioned in the embodiment refers to polarization light whose polarization direction is parallel to the incident plane, and the S light (S polarized light) refers to polarization light whose polarization direction is perpendicular to the incident direction, wherein the S polarized light can be reflected to the reflecting element 175 at an angle of 90°, and then reflected by the reflecting element 175 at an angle of 90° to be parallel to the P polarized light. Specifically, the 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 formed by the incident light ray and the surface normal. When the P light encounters an interface, its electric field component is parallel to the incident plane. The 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.

[0050] Referring to Figure 3 and Figure 6 Further, the light splitting 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 splitting prism 173, and is used for receiving P light and converging to form a first light splitting signal, the second imaging unit 179 is arranged on the reflection path of the reflecting element 175, and is used for receiving S light and converging to form a second light splitting signal, and the first imaging unit 177 and the second imaging unit 179 are respectively arranged corresponding to the two adjacent detection units 131. Specifically, the first imaging unit 177 and the second imaging unit 179 can be arranged corresponding to the imaging areas of the two adjacent detection units 131 respectively, and the first imaging unit 177 and the second imaging unit 179 can be lenses, which can realize light converging imaging function and are more conducive to imaging of the detection unit 131.

[0051] In the embodiment, the light splitting module 170 is taken as an example of 9, wherein the dichroic filter 171, the polarization splitting piece, the reflecting element 175, the first imaging unit 177 and the second imaging unit 179 are all 9, and the first reflecting module 153 is two, so as to form 3 rows of parallel light beam structures. The process of spectral separation and polarization separation of the light splitting imaging system 100 provided in the embodiment will be introduced in detail.

[0052] Referring to Figure 3, the incident light signal (light beam) first reaches the light-in module 151, which changes the propagation direction of the light beam by means of a mirror, so that the light signal can propagate in the first direction, so that it enters the first dichroic filter 171, which selectively separates the light beam of a 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 parallel to the incident plane) directly transmits through the first polarization beam splitter prism 173, and the S-polarized light (polarization direction perpendicular to the incident plane) reflects at an angle of 90 degrees and then passes through the corresponding reflecting element 175, and then exits parallel to the P light. After the P light passes through the corresponding first imaging unit 177, it is imaged onto the corresponding detection unit 131 (P light) of the detector; after the S light passes through the second imaging unit 179, it is imaged onto the corresponding detection unit 131 (S light) of the detector. See Figures 5 to 7 .

[0053] Please continue to see Figure 3 , the light transmitted through the first dichroic filter 171 continues to propagate, and the second dichroic filter 171 further separates the remaining light beam to extract a specific wavelength Δλ2 light signal, which is reflected at an angle of 90 degrees to the second polarization beam splitter prism 173. The P-polarized light directly transmits, and the S-polarized light reflects at an angle of 90 degrees and then passes through the corresponding reflecting element 175, and then exits parallel to the P light. After the P light passes through the first imaging unit 177, it is imaged onto the corresponding detection unit 131 (P light) of the detector; after the S light passes through the second imaging unit 179, it is imaged onto the corresponding detection unit 131 (S light) of the detector. See Figures 5 to 7 .

[0054] Please continue to see Figure 3 , the remaining light beam continues to propagate, enters the third dichroic filter 171, and the third dichroic filter 171 further separates the remaining light beam to extract a specific wavelength Δλ3 energy, which is reflected at an angle of 90 degrees to the third polarization beam splitter prism 173. The P-polarized light directly transmits, and the S-polarized light reflects at an angle of 90 degrees and then passes through the corresponding reflecting element 175, and then exits parallel to the P light. After the P light passes through the first imaging unit 177, it is imaged onto the corresponding detection unit 131 (P light) of the detector; after the S light passes through the second imaging unit 179, it is imaged onto the corresponding detection unit 131 (S light) of the detector. See Figures 5 to 7 .

[0055] See Figure 3 and Figure 4 , the light beam can continue to propagate through the next dichroic filter 171 as needed, or it can be folded back after being offset by a certain distance through the prism. This structure can be arbitrarily lengthened or shortened according to the number of spectral bands that need to be split. The folded optical element can be a roof prism or a combination of mirrors.

[0056] In this example, after the light beam passes through the third dichroic filter 171, the remaining spectral band light signal enters the first reflection module 153, i.e., the roof prism reflects and translates a certain distance and then folds back. The size of the offset depends on the diameter of the light beam and the structural layout of the system.

[0057] The roof prism folds the light beam back to the fourth, fifth, and sixth dichroic filters 171, which separate the spectral bands Δλ4, Δλ5, and Δλ6, respectively, and reflect them at an angle of 90°. The reflected band light signals pass through the fourth, fifth, and sixth polarization beam splitting prisms 173, respectively. The P-polarized light is directly transmitted, and the S-polarized light is reflected at 90° to the corresponding reflecting elements 175 and then exits parallel to the P light. The exiting P-polarized light is imaged by the corresponding first imaging units 177 and then incident on the detection unit 131 of the detector. Similarly, the S-polarized light is imaged by the second imaging units 179 and then imaged by the detection unit of the detector, which can be seen in Figures 5 to 7 .

[0058] The remaining spectral band light signal again passes through the second reflection module, i.e., the second roof prism radiates and translates a certain distance and then folds back. The folded light signal passes through the seventh, eighth, and ninth dichroic filters 171, which separate the spectral bands Δλ7, Δλ8, and Δλ9, respectively, and reflect them at an angle of 90°. The reflected band light signals pass through the seventh, eighth, and ninth polarization beam splitting prisms 173, respectively. The P-polarized light is directly transmitted, and the S-polarized light is reflected at 90° to the corresponding reflecting elements 175 and then exits parallel to the P light. The exiting P-polarized light is incident on the detection unit 131 of the detector after passing through the corresponding first imaging units 177. Similarly, the S-polarized light is imaged by the second imaging units 179 and then imaged by the detection unit 131 of the detector, which can be seen in Figures 5 to 7 .

[0059] The detection device 130 can be a single camera or a camera system composed of multiple cameras. The specific selection and setting can be made according to the actual situation.

[0060] Please continue to see Figure 1In the embodiment, the light-splitting imaging system 100 further comprises an infinity-corrected objective 190 arranged on the light-incoming side of the light-splitting module 110, which is used to collect the light energy of the target object and form a collimated incident light signal. Specifically, the infinity-corrected objective is a modern objective design. The objective of this design is different from the traditional finite-corrected objective, which can produce a parallel light beam. The collimated incident light signal refers to a signal that maintains parallelism during propagation after being processed by the infinity-corrected objective 190. The infinity-corrected objective 190 can complete the collection of light energy from the target object and image to infinity, and the collimated light signal collected by the objective can enter the light-splitting module 110, which can arrange the light signals of different wavelengths and polarizations in a certain array. The array-arranged light beams are imaged onto the array detection units 131 of the detector to complete a shooting and obtain multiple spectral bands and image acquisition of different polarization states.

[0061] It should be noted that the embodiment adopts modular design, in which the infinity-corrected objective 190, the components in the light-splitting module 110, and the detection device 130 are all designed in a modular manner, which is convenient for assembly, disassembly, replacement, and upgrading. The detection device 130 can be a detector, which can be divided into different regions in an array manner to form detection units 131, or can be directly formed by multiple detector arrays to form multiple detection units 131. In addition, each optical element used in the embodiment can be a cut-off separated optical element or an integrated optical element. Moreover, the modular design can be expanded and optimized according to actual needs, and more bands and polarization states of light signals can be collected by increasing or decreasing the number of filters and detection units. The light-splitting module 110 can be applied to multi-spectral imaging, hyper-spectral imaging, fluorescence imaging, and other application scenarios.

[0062] In summary, the light splitting imaging system 100 provided by the embodiment of the utility model, adopt the incident module and multiple first reflection module 153 in optical path conduction assembly 150 to construct the propagation path of optical signal, and distribute multiple light splitting module 170 array on the propagation path of optical signal, thereby can separate optical signal into multiple array distribution light splitting signal which emit light to the same direction according to the difference of wavelength, and multiple detection units 131 of detection device 130 are also array distribution and correspond to light splitting signal one by one, thereby can receive multiple light splitting signal and array imaging. Compared with the multi-channel segmentation scheme and the whole light splitting scheme in prior art, the embodiment of the utility model can separate optical signal into multiple light splitting signal according to the difference of wavelength by multiple array distribution light splitting module 170, each light splitting signal can retain the whole image while collecting the specified wavelength information of the photographed target, thereby make the optical signal of spectral dimension be unfolded to two-dimensional space, and image to the same plane, facilitate to lay the detection unit 131 of detection device 130, therefore can obtain the optical information of spectral dimension by multiple detection units 131 once shooting, because each light path collects the information of the whole photographed target respectively, instead of only collecting the local information of the photographed target, so do not need to carry out image processing, can greatly improve the acquisition speed of system. Meanwhile, multiple dichroic filters 171 are used to split light in turn, which will only realize the light splitting according to the spectral segment, and will not filter the light energy, so it will not cause the waste of energy, and each separated light splitting signal can be rearranged and imaged, avoiding the energy loss of optical signal, ensuring the imaging efficiency and sensitivity.

[0063] Second embodiment

[0064] Referring to Figures 8 to 10 The embodiment provides a light splitting imaging system 100, which has the same basic structure, principle, technical effects and the first embodiment. For brief description, the part not mentioned in the embodiment can refer to the corresponding content in the first embodiment.

[0065] In the embodiment, the light path conducting assembly 150 comprises an incident light module 151, at least one first reflecting module 153 and at least one second reflecting module 155. The incident light module 151 is configured to receive the incident light signal and separate the light signal into P light and S light which are parallel to each other. The first reflecting module 153 is arranged in the light emitting direction of the P light and is configured to change the propagation direction of the P light. At least one light splitting module 170 is arranged between the incident light module 151 and the first reflecting module 153. The second reflecting module 155 is arranged in the light emitting direction of the S light and is configured to change the propagation direction of the S light. At least one light splitting module 170 is arranged between the incident light module 151 and the second reflecting module 155. Specifically, the first reflecting module 153 and the second reflecting module 155 can both be two roof prisms, and the light splitting module 170 can be 18 and form two 3x3 arrays. The basic light splitting principle can refer to the first embodiment.

[0066] In the embodiment, the incident light module 151 comprises a polarization light splitting prism 173, a first reflecting mirror 157 and a second reflecting mirror 159. The polarization light splitting prism 173 is configured to transmit the P light and reflect the S light. The first reflecting mirror 157 is arranged in the transmission path of the polarization light splitting prism 173 and is configured to change the propagation direction of the P light. The second reflecting mirror 159 is arranged in the reflection path of the first reflecting mirror 157 and is configured to reflect the P light, so that the P light and the S light can be emitted in parallel. The first reflecting mirror 157 can be a roof prism, and the second reflecting mirror 159 can be an incident reflecting mirror which can adjust the propagation direction of the light signal. Specifically, the incident light signal is first separated into S polarized light and P polarized light by the polarization light splitting prism 173. The S polarized light can directly enter the light splitting module 170 for light splitting arrangement, and the P polarized light can be emitted in parallel with the S polarized light after being reflected by the combination of the first reflecting mirror 157 and the second reflecting mirror 159, and also undergoes light splitting arrangement by the light splitting module 170, so that the plurality of light splitting modules 170 are also arranged in an array.

[0067] In the embodiment, the light splitting module 170 comprises a dichroic filter 171 and a first imaging unit 177. The dichroic filter 171 is arranged in the propagation path of the S light or the P light and is configured to reflect the S light or the P light of a predetermined wavelength and transmit the S light or the P light of the remaining wavelengths. The first imaging unit 177 is arranged in the reflection path of the dichroic filter 171 and is configured to receive the P light or the S light and converge to form a light splitting signal.

[0068] It should be noted that the embodiment separates the incident light signal by polarization state first, and then separates and arranges the signals of different wavebands through the prism. Specifically, the incident light signal is limited to enter the polarization beam splitter prism 173, in which the P-polarized light is directly transmitted, and the S-polarized light is reflected at 90°. The S-polarized light is arranged in a two-dimensional spatial array after passing through a series of dichroic filters 171 and the first reflection module 153. The P-polarized light directly transmitted through the polarization beam splitter prism 173 is arranged spatially separated from the S-polarized light after passing through the first mirror 157, and similarly, the S-polarized light is arranged in a two-dimensional spatial array after passing through a series of dichroic filters 171 and the second reflection module 155.

[0069] It should be noted that similar reference numbers and letters refer to similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0070] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0071] In the description of the utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0072] Finally, it should be noted that: the above-described embodiments, only for the specific embodiments of the present application, to illustrate the technical scheme of the present application, rather than limit it, the scope of protection of the present application is not limited to this, although the foregoing detailed description of the present application is made by referring to the prior art, those skilled in the art should understand: any familiar with the technical field of the technical person within the scope of the present application disclosed by the technology, it still can be modified or easily thought of changes to the technical solution recorded in the foregoing examples, or part of the technical features of the equivalent replacement; and these modifications, changes or replacement, and do not make the corresponding technical solutions of the essence of the present application embodiments technical scheme deviate from the spirit and scope. All should be covered in the scope of protection of the present application. Therefore, the scope of protection of the present application should be said to the scope of protection of the claims.

Claims

1. A light splitting module, characterized by, The application relates to an optical path conducting assembly (150) and a plurality of light splitting modules (170), the optical path conducting assembly (150) is used for receiving an incident optical signal and propagating the optical signal in at least one direction, and the plurality of light splitting modules (170) are distributed on the propagation path of the optical signal and used for splitting the optical signal into a plurality of light splitting signals which are emitted in the same direction, wherein the plurality of light splitting signals are different in wavelength and / or polarization.

2. The light splitting module according to claim 1, wherein, The optical path conducting assembly (150) comprises an optical receiving module (151) and at least one first reflecting module (153), the optical receiving module (151) is used for receiving the incident optical signal and propagating the optical signal in a first direction, the first reflecting module (153) is arranged in the light emitting direction of the optical receiving module (151) and used for changing the propagation direction of the optical signal, at least one light splitting module (170) is arranged between the optical receiving module (151) and the first reflecting module (153), and at least one light splitting module (170) is also arranged in the light emitting direction of the first reflecting module (153).

3. The light splitting module according to claim 2, wherein, The first reflecting module (153) is a plurality of first reflecting modules (153) which are distributed along the propagation direction of the optical signal, each first reflecting module (153) is used for reflecting the optical signal from the first direction to the second direction or reflecting the optical signal from the second direction to the first direction, and a plurality of parallel optical paths are formed, wherein the first direction and the second direction are opposite, and at least one light splitting module (170) is arranged between every two adjacent first reflecting modules (153) in the first direction and / or the second direction; and / or, The first reflecting module (153) comprises a roof prism which is arranged at one end of two adjacent optical paths and used for reflecting the optical signal after shifting by a preset distance.

4. The light splitting module according to claim 2, wherein, The plurality of light splitting modules (170) are arrayed, each light splitting module (170) comprises a dichroic filter (171), a polarization splitting prism (173) and a reflecting element (175), the dichroic filter (171) is arranged on the propagation path of the optical signal and used for reflecting the optical signal of a preset wavelength and transmitting the optical signal of the remaining wavelengths, the polarization splitting prism (173) is arranged on the reflection path of the dichroic filter (171) and used for transmitting P light and reflecting S light, and the reflecting element (175) is arranged on the reflection path of the polarization splitting prism (173) and used for reflecting the S light in a direction parallel to the P light.

5. The light splitting module according to claim 4, wherein, The light splitting 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 splitting prism (173) and used for receiving the P light and converging to form a first light splitting signal, and the second imaging unit (179) is arranged on the reflection path of the reflecting element (175) and used for receiving the S light and converging to form a second light splitting signal.

6. The light splitting module of claim 1, wherein, The light path conducting assembly (150) comprises an incident light module (151), at least one first reflecting module (153) and at least one second reflecting module (155), the incident light module (151) is used for receiving the incident light signal and separating the light signal into P light and S light, the first reflecting module (153) is arranged in the light output direction of the P light and is used for changing the propagation direction of the P light, at least one light splitting module (170) is arranged between the incident light module (151) and the first reflecting module (153), the second reflecting module (155) is arranged in the light output direction of the S light and is used for changing the propagation direction of the S light, and at least one light splitting module (170) is arranged between the incident light module (151) and the second reflecting module (155).

7. The light splitting module according to claim 6, wherein, The incident light module (151) comprises a polarization light splitting prism (173), a first reflecting mirror (157) and a second reflecting mirror (159), the polarization light splitting prism (173) is used for transmitting the P light and reflecting the S light, the first reflecting mirror (157) is arranged on the transmission path of the polarization light splitting prism (173) and is used for changing the propagation direction of the P light, and the second reflecting mirror (159) is arranged on the reflection path of the first reflecting mirror (157) and is used for reflecting the P light to make the P light and the S light parallel to each other.

8. The light splitting module according to claim 6, wherein, A plurality of light splitting modules (170) are arrayed, each light splitting module (170) comprises a dichroic filter (171), the dichroic filter (171) is arranged on the propagation path of the S light and is used for reflecting the S light of a preset wavelength and transmitting the S light of the remaining wavelengths; or the dichroic filter (171) is arranged on the propagation path of the P light and is used for reflecting the P light of a preset wavelength and transmitting the P light of the remaining wavelengths.

9. The light splitting module according to claim 8, wherein, The light splitting module (170) further comprises a first imaging unit (177), the first imaging unit (177) is arranged on the reflection path of the dichroic filter (171) and is used for receiving the P light or the S light and converging to form the light splitting signal.

10. A spectroscopic imaging system characterized by, The light splitting module (170) further comprises a first imaging unit (177), the first imaging unit (177) is arranged on the reflection path of the dichroic filter (171) and is used for receiving the P light or the S light and converging to form the light splitting signal.

11. The spectrographic imaging system of claim 10, wherein, The detection device (130) is at least one camera; and / or, A plurality of detection units (131) are arrayed; and / or, The light splitting imaging system further comprises an infinite conjugate objective lens (190), the infinite conjugate objective lens (190) is arranged on the incident side of the light splitting module (110) and is used for collecting the light energy of the target object and forming the collimated incident light signal.

Images