Spectral imaging device

Abstract

A spectral imaging device disclosed by the present invention comprises a lens, a reflection surface, a light splitting part and a detection part, the lens is used for obtaining light from the outside and enabling the obtained light to enter the reflection surface, the reflection surface, the light splitting part and the detection part are integrally assembled, the light splitting part and the reflection surface are oppositely arranged, the reflection surface is used for reflecting the light to the light splitting part, and the detection part is used for detecting the light splitting part. The light splitting part is used for splitting light to generate split light beams with different spectrums, the generated split light beams enter the reflecting surface, the reflecting surface reflects the split light beams to enable the reflected split light beams to enter the detection part, and the detection part generates an electric signal based on the received light. According to the spectral imaging device, the reflecting surface is arranged, so that the light acquired by the lens passes through the light splitting part and finally reaches the propagation light path of the detection part to form a W-shaped propagation light path, the spectral imaging device is compact in structure, the size can be reduced, and the reflecting surface, the light splitting part and the detection part are integrally assembled, so that the stability of the spectral imaging device is improved.

Description

Technical Field

[0001] The invention relates to the field of optical systems, and in particular to a spectral imaging device. Background Art

[0002] With the development of spectral technology, multispectral cameras and hyperspectral cameras are widely used in various research, industrial and remote sensing applications to capture and analyze electromagnetic spectra. Multispectral cameras can only obtain a small number of optical spectrum bands (usually greater than or equal to 3), and the spectral band information collected is relatively small. In many cases, the reflectivity characteristic spectrum of the material may vary very complexly relative to the wavelength, and other tiny features may not be distinguishable using multispectral cameras. Therefore, hyperspectral cameras with more spectral bands are needed to more accurately obtain more complex material features.

[0003] Hyperspectral cameras can more accurately capture the spectral characteristics of even complex objects, and have extended spectrum detection performance for visible light, sub-visible light, and above visible light. They can capture small features and subtle changes between features, thereby achieving fast, accurate, and intuitive imaging. At present, hyperspectral cameras use prisms and transmission grating spectroscopic solutions, which are generally large in size and mass, and have obvious restrictions on drone mounting requirements. At the same time, they also have the problem of poor stability. Summary of the invention

[0004] The object of the present invention is to provide a spectral imaging device with a compact structure, capable of reducing the volume and improving the stability.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A spectral imaging device comprises a lens, a reflective surface, a spectroscopic part and a detection part, wherein the lens is used to obtain light from the outside and make the obtained light incident on the reflective surface;

[0007] The reflecting surface, the spectroscopic part and the detecting part are assembled as a whole, the spectroscopic part is arranged opposite to the reflecting surface, the reflecting surface is used to reflect the light to the spectroscopic part, the spectroscopic part is used to split the light to generate spectroscopic light beams of different spectra, the generated spectroscopic light beams are incident on the reflecting surface, the reflecting surface is also used to reflect the spectroscopic light beams so that the reflected spectroscopic light beams are incident on the detecting part, and the detecting part is used to generate an electrical signal based on the received light.

[0008] Optionally, it further comprises a slit and a lens group, wherein the slit, the lens group, the reflecting surface, the light splitting unit and the detection unit are integrally assembled;

[0009] The slit is used to allow the light from the lens to pass through, so that the light is incident on the reflecting surface;

[0010] The lens group is arranged between the spectroscopic part and the reflecting surface, the light from the lens passes through the lens group and then is incident on the reflecting surface, the reflecting surface reflects the light so that the reflected light passes through the lens group and then is incident on the spectroscopic part, and the spectroscopic light beam generated by the spectroscopic part passes through the lens group and then is incident on the reflecting surface, and the spectroscopic light beam reflected by the reflecting surface passes through the lens group and then is incident on the detection part.

[0011] Optionally, a preset shell is further included, wherein the preset shell is provided with a cavity, the lens group and the reflecting surface are arranged in the cavity, the slit, the spectroscopic part and the light opening are arranged at one end of the preset shell, the detection part is arranged outside the preset shell and the detection part and the light opening are arranged correspondingly, so that the light passing through the slit enters the cavity, is incident on the lens group and passes through the lens group and then is incident on the reflecting surface, and the spectroscopic light beam reflected by the reflecting surface and passing through the lens group passes through the light opening and then is incident on the detection part.

[0012] Optionally, it also includes a circuit board, a filter, a filter seat and a frame seat, the detection part is arranged on the circuit board, the filter is installed on the filter seat, the filter seat is installed on the circuit board, so that the filter is on the side of the detection part that receives light, the circuit board is installed on the frame seat, and the frame seat is connected to one end of the preset shell, so that the detection part and the light opening are arranged correspondingly.

[0013] Optionally, it further includes a circuit board, a frame seat and a first gasket, the detection part is arranged on the circuit board, the circuit board is mounted on the frame seat, and the frame seat is connected to one end of the preset housing, so that the detection part is arranged corresponding to the light opening;

[0014] The first pad is used to be arranged between the frame seat and the end of the preset shell, and the first pad includes a plurality of first pads of different thicknesses, so that the position of the detection part can be changed by replacing the first pads of different thicknesses so that the detection part corresponds to the image plane.

[0015] Optionally, it further comprises a front shell and a middle shell connected to each other, the lens is arranged in the front shell, and the light splitting part, the reflecting surface and the detecting part are arranged in the middle shell;

[0016] The detection part is arranged on a circuit board, at least a part of the circuit board is a heat dissipation area, the front housing is provided with a heat dissipation part, and the heat dissipation area of ​​the circuit board contacts the heat dissipation part of the front housing.

[0017] Optionally, it further comprises a front housing, wherein an adapter ring is provided on the front housing, and the adapter ring is used to install the lens;

[0018] The spectral imaging device also includes a camera module for acquiring a large field of view image of the outside world. The camera module is arranged on the front shell body. The front shell body is also provided with a window. The camera module is arranged corresponding to the window so that light from the outside world enters the camera module after passing through the window.

[0019] Optionally, it also includes a rear shell and a main control board, the main control board is arranged in the rear shell, the rear shell is provided with a heat dissipation surface, the high-heat components of the main control board are bonded to the heat dissipation surface through a heat-conducting medium, and heat dissipation fins are provided on the outer side of the rear shell.

[0020] Optionally, it also includes a rear shell, a base plate and a main control board, the base plate and the main control board are arranged in the rear shell, the main control board and the base plate are connected to each other through an inter-board connector, the base plate is provided with a connector and a corresponding external interface, and the cable led out of the detection part is connected to the connector.

[0021] Optionally, a camera module is also included for acquiring a large field of view image of the outside world, wherein the large field of view image is used for displaying on the platform and locating the position of the spectral imaging spectrum line in the large field of view image.

[0022] It can be known from the above technical scheme that a spectral imaging device provided by the present invention includes a lens, a reflective surface, a spectroscopic part and a detection part. The lens is used to obtain light from the outside world and make the obtained light incident on the reflective surface. The reflective surface, the spectroscopic part and the detection part are assembled as a whole. The spectroscopic part is arranged relative to the reflective surface. The reflective surface is used to reflect light to the spectroscopic part. The spectroscopic part is used to split the light to produce spectroscopic beams of different spectra. The generated spectroscopic beams are incident on the reflective surface. The reflective surface reflects the spectroscopic beams so that the reflected spectroscopic beams are incident on the detection part. The detection part generates an electrical signal based on the received light. The spectral imaging device of the present invention forms a "W"-shaped propagation optical path by setting a reflective surface so that the propagation optical path of the light obtained by the lens passes through the spectroscopic part and finally reaches the detection part, so that the spectral imaging device has a compact structure and can reduce the volume. In addition, the reflective surface, the spectroscopic part and the detection part are assembled as a whole, which helps to improve the stability of the spectral imaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] FIG1 is a schematic diagram of a spectral imaging device provided by an embodiment of the present invention;

[0025] FIG2 is a schematic diagram of a propagation light path of a spectrum module of a spectrum imaging device according to an embodiment of the present invention;

[0026] FIG3 is an exploded schematic diagram of the structure of a spectrum module of a spectrum imaging device provided by an embodiment of the present invention;

[0027] FIG4 is a schematic diagram of the overall structure of a spectral imaging device provided by an embodiment of the present invention;

[0028] FIG5 is a schematic diagram of an exploded structure of a spectral imaging device provided by an embodiment of the present invention.

[0029] The reference numerals in the drawings of the specification include:

[0030] 1-front shell module, 101-lens, 102-camera module, 103-front shell, 104-adapter ring, 105-window sheet, 106-second gasket, 107-convex part;

[0031] 2-middle shell module, 201-slit, 202-spectrometer, 203-reflection surface, 204-lens group, 205-filter, 206-detection unit, 207-preset shell, 208-fold reflective lens, 209-lens, 210-middle shell, 211-spectral module, 212-circuit board, 213-filter seat, 214-frame seat, 215-first gasket, 216-pressing ring;

[0032] 3-rear shell module, 301-bottom plate, 302-main control board, 303-external interface, 304-power supply module, 305-signal control module, 306-data transmission and storage module, 307-rear shell, 308-indicator light column. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] This embodiment provides a spectral imaging device, including a lens, a reflective surface, a spectroscopic unit, and a detection unit, wherein the lens is used to obtain light from the outside and make the obtained light incident on the reflective surface;

[0035] The reflecting surface, the spectroscopic part and the detecting part are assembled as a whole, the spectroscopic part is arranged opposite to the reflecting surface, the reflecting surface is used to reflect the light to the spectroscopic part, the spectroscopic part is used to split the light to generate spectroscopic light beams of different spectra, the generated spectroscopic light beams are incident on the reflecting surface, the reflecting surface is also used to reflect the spectroscopic light beams so that the reflected spectroscopic light beams are incident on the detecting part, and the detecting part is used to generate an electrical signal based on the received light.

[0036] The light from the outside world may be light from a monitoring target, so that spectral imaging of the monitoring target can be achieved through the spectral imaging device.

[0037] Light from the outside world enters the lens, passes through the lens and is incident on the reflecting surface. The reflecting surface reflects the light to the spectrometer. The spectrometer splits the light to produce spectroscopic light beams of different spectra. The produced spectroscopic light beams are incident on the reflecting surface. The reflecting surface further reflects the spectroscopic light beams so that the spectroscopic light beams are incident on the detection unit. The detection unit generates an electrical signal based on the received light to realize spectral imaging.

[0038] The integral assembly of the reflective surface, the spectroscopic part and the detection part means that the reflective surface, the spectroscopic part and the detection part are assembled together, and the three can move as a whole. The spectral imaging device of this embodiment forms a "W"-shaped propagation light path by setting the reflective surface so that the propagation light path of the light acquired by the lens through the spectroscopic part and finally reaching the detection part forms a "W"-shaped propagation light path, making the spectral imaging device compact in structure and reducing the volume compared with the existing hyperspectral camera using prism or transmission grating spectroscopic solutions, and the integral assembly of the reflective surface, the spectroscopic part and the detection part helps to improve the stability of the spectral imaging device.

[0039] The light is incident on the spectroscopic part, diffracted and generates spectroscopic beams of different spectra. In this embodiment, the spectroscopic beam generated by the spectroscopic part and the light incident on the spectroscopic part are on the same side of the spectroscopic part, so the reflection surface reflects the light to the spectroscopic part, and the spectroscopic beam generated by the spectroscopic part can be incident on the reflection surface. The spectroscopic part can use a grating, specifically a reflection grating.

[0040] In some embodiments, the spectral imaging device may further include a slit, wherein the slit is used to allow the light from the lens to pass through and to allow the light to be incident on the reflective surface. The slit can serve as a field of view aperture of the spectral imaging device, and the slit can be set on the image plane of the lens to define the imaging area and limit the image field of the lens. In some embodiments, the width of the slit is adjustable. In some embodiments, the spectral imaging device may adopt push-sweep imaging, and the slit is used to convert the light beam after passing through the lens into a linear light beam. When the spectral imaging device is working, it is pushed in a direction perpendicular to the slit, and the push-sweep passes over the monitoring target to complete the push-sweep imaging of the monitoring target.

[0041] In some embodiments, the spectral imaging device may further include a lens group, wherein the lens group is disposed between the spectroscopic part and the reflective surface, the light from the lens passes through the lens group and is incident on the reflective surface, the reflective surface reflects the light so that the reflected light passes through the lens group and is incident on the spectroscopic part, and the spectroscopic light beam generated by the spectroscopic part passes through the lens group and is incident on the reflective surface, and the spectroscopic light beam reflected by the reflective surface passes through the lens group and is incident on the detection part. In some embodiments, the light from the lens is incident on the spectroscopic part in a collimated form through the lens group and the reflective effect of the combined reflective surface, and the generated spectroscopic light beam is imaged on the detection part, so that the generated spectroscopic light beam is incident on the detection part in a converging form. Making the light from the lens incident on the spectroscopic part in a collimated form helps to improve the accuracy of spectral imaging.

[0042] In some embodiments, the slit, lens group, reflective surface, spectrometer and detection unit are assembled as a whole, that is, the slit, lens group, reflective surface, spectrometer and detection unit are assembled together, which helps to improve the stability of the spectral imaging device. For example, reference can be made to Figure 1, which is a schematic diagram of a spectral imaging device provided by an embodiment, and the straight line with an arrow in the figure represents the light propagation path. As shown in the figure, the slit 201, lens group 204, reflective surface 203 and spectrometer 202 are assembled as a whole, and are all arranged in a preset housing 207. The slit 201 and the spectrometer 202 are both arranged opposite to the reflective surface 203, and the lens group 204 is arranged between the spectrometer 202 and the reflective surface 203. The light from the lens 101 passes through the slit 201, the reflective surface 203, the spectrometer 202, the reflective surface 203, and the propagation path of the detection unit 206 in sequence to form a "W"-shaped propagation light path.

[0043] In some embodiments, the reflective surface 203 may be a curved surface, and may be, but not limited to, a spherical surface. The reflective surface 203 may be, but not limited to, a spherical reflector.

[0044] In this embodiment, the structure of the lens group 204 is not limited. In some embodiments, the lens group 204 includes a catadioptric lens and at least one lens, the catadioptric lens is arranged on the side of the at least one lens away from the light splitting part 202, and the surface of the catadioptric lens away from the light splitting part 202 is the reflective surface 203. In this embodiment, a catadioptric lens is used, and one surface of the catadioptric lens is used as a reflective surface, which helps to make the structure compact and reduce the number of optical elements. For example, reference can be made to FIG. 2, which is a schematic diagram of the propagation light path of the spectrum module of the spectrum imaging device of an embodiment. As shown in the figure, the spectrum module 211 includes a lens 209 and a catadioptric lens 208, the surface of the catadioptric lens 208 away from the side of the lens 209 is the reflective surface 203, the lens 209 is a convex lens, and the side of the catadioptric lens 208 close to the lens 209 is a concave surface. After the light from the lens 101 passes through the slit 201, it passes through the lens 209 and the catadioptric lens 208 and is incident on the light splitting part 202 in a collimated form. The light reflected by the spectroscopic unit 202 passes through the lens 209 and the catadioptric lens 208 twice and then enters the detection unit 206 in a convergent form.

[0045] The light splitting unit 202 may adopt a wedge-shaped reflection grating or a reflection-type blazed grating, which has small energy loss and high efficiency. The detection unit 206 may be a detector.

[0046] In some embodiments, a filter 205 may be provided on the side of the detector 206 receiving light, for intercepting diffraction stray light of other orders except the required spectral order. If there is no diffraction stray light of additional orders in the imaging device, the filter 205 may not be provided. The filter 205 may be a second-order spectral suppression filter. Referring to FIG. 1 and FIG. 2, the light after passing through the lens 101 enters the slit 201, passes through the lens group 204, and is reflected by the reflection surface 203 for the first time. After reflection, it passes through the lens group 204 to reach the spectrometer 202. After being reflected by the spectrometer 202, the light passes through the lens group 204 again and reaches the reflection surface 203. After the second reflection by the reflection surface 203, the reflected light is filtered by the filter 205 and received by the detector 206, realizing a complete light path transmission.

[0047] A filter 205 can be set on the surface of the detection part 206 to perform second-order spectral suppression and achieve seamless alignment of the filter pixel level, so that the wavelength data of the entire image surface is continuous, and high-resolution and high-precision spectral acquisition and imaging are achieved, which can meet the application of multiple scenarios such as agriculture, environment, mineral exploration, medical diagnosis and remote sensing image analysis, which have more stringent and more accurate requirements for monitoring data.

[0048] The slit 201, the lens group 204, the reflective surface 203, the light splitting part 202, the filter 205 and the detection part 206 constitute a spectrum module 211, which can be integrated on the preset housing 207. After installation and adjustment, it can be used as a spectrum module 211 with complete functions and independent debugging support. As an independent optical system, its imaging performance will not be affected by other external assembly processes and devices, and can achieve long-term high-stability reliable operation. The preset housing 207 can be called a spectrometer housing. In the imaging optical path design, a reflection grating is selected, combined with the lens group 204 and the reflective surface 203, the overall optical path design is compact, and the size of the spectral imaging device is ensured to be miniaturized. At the same time, the number of optical elements in the entire system is small, and the components can be encapsulated in the spectrometer housing. There is no complex and special installation and adjustment process requirement, which reduces the difficulty of installation and adjustment. The spectrum module 211 is the key to ensuring the high resolution and high stability of the entire imaging device.

[0049] In this spectral imaging device, the optical components that have a greater impact on imaging performance and continuous stability are designed as independent spectral modules 211, and the optical path and each optical element of the spectral module 211 can be independently assembled and verified. First, the spectral module 211 can be assembled in advance to reduce the difficulty of assembly. It is packaged and integrated into a separate module with a complete optical path structure. Each optical element is integrated in the spectrometer housing, which reduces the difficulty of installing the optical elements and simplifies the assembly process; second, the spectral module 211 is an independent module after assembly and integration, and the optical index performance will not be affected by subsequent assembly operations, which is an effective guarantee for achieving high reliability and continuous stability of spectral imaging.

[0050] In some embodiments, the spectral imaging device further includes a preset housing 207, the preset housing 207 is provided with a cavity, the lens group 204 and the reflective surface 203 are provided in the cavity, the slit 201, the light splitting unit 202 and the light through port are provided at one end of the preset housing 207, the detector 206 is provided outside the preset housing 207 and the detector 206 is provided corresponding to the light through port, so that the light passing through the slit 201 enters the cavity, is incident on the lens group 204 and passes through the lens group 204 before being incident on the reflective surface 203, and the light splitting beam reflected by the reflective surface 203 and passing through the lens group 204 passes through the light through port before being incident on the detector 206. In this way, the slit 201, the lens group 204, the reflective surface 203, the light splitting unit 202 and the detector 206 are assembled as a whole and are all integrated on the preset housing 207. For example, reference may be made to FIG3 , which is an exploded schematic diagram of the structure of a spectrum module of a spectrum imaging device provided by an embodiment, as shown in the figure. A slit 201, a light splitting part 202 and a light through port are provided at one end of a preset housing 207, and a slit 201, a mounting port and a light through port are provided on the end of the preset housing 207 from right to left in sequence, the mounting port is used to install the light splitting part 202, the light splitting part 202 is provided in the mounting port, the detection part 206 is provided corresponding to the light through port, and the lens group 204 and the reflection surface 203 are provided in the cavity of the preset housing 207.

[0051] In some embodiments, the spectral imaging device may further include a circuit board and a frame seat, the detection unit 206 is arranged on the circuit board, the circuit board is installed on the frame seat, and the frame seat is connected to one end of the preset shell 207, so that the detection unit 206 is arranged corresponding to the light opening, thereby integrating the detection unit 206 into the preset shell 207.

[0052] In some embodiments, the spectral imaging device may further include a filter 205 and a filter seat, wherein the filter 205 is mounted on the filter seat, and the filter seat is mounted on the circuit board, so that the filter 205 is on the side where the detection unit 206 receives light, and the circuit board is mounted on the frame seat, and the frame seat is connected to one end of the preset housing 207, so that the detection unit 206 is arranged corresponding to the light port. As shown in FIG. 3, the detection unit 206 is packaged and integrated on the circuit board 212, and the filter 205 can be mounted in the inner groove of the filter seat 213 by bonding, and the filter seat 213 after the integrated filter 205 is mounted at a specified position of the circuit board 212. The circuit board 212 after the filter assembly (i.e., the filter seat 213 with the integrated filter 205) is installed in the frame seat 214, and can be used as a complete imaging module assembly after integration.

[0053] In some embodiments, the filter holder 213 after the integrated filter 205 can be installed at a specified position of the circuit board 212 by screws, and a certain assembly margin can be reserved for the installation holes between the circuit board 212 and the filter holder 213, so that the position of the filter 205 can be fine-tuned according to the actual beam position during the installation process to reduce the influence of device processing errors and gross errors. The circuit board 212 after the filter assembly is installed can be installed in the frame seat 214 by screws.

[0054] In some embodiments, the spectral imaging device may further include a circuit board 212, a frame seat 214, and a first gasket 215. The detection unit 206 is disposed on the circuit board 212. The circuit board 212 is mounted on the frame seat 214. The frame seat 214 is connected to one end of the preset housing 207, so that the detection unit 206 is disposed corresponding to the light opening; the first gasket 215 is used to be disposed between the frame seat 214 and the end of the preset housing 207. The first gasket 215 includes a plurality of first gaskets 215 of different thicknesses, so that the position of the detection unit 206 is changed by replacing the first gaskets 215 of different thicknesses, so that the detection unit 206 corresponds to the image plane. The image plane refers to the image plane of this optical component composed of the lens group 204 and the reflection surface 203. Due to the error in the processing of the structural parts, there will be a slight error between the image plane of the optical component and the theoretical design value. Therefore, in the installation and adjustment, it is necessary to fine-tune the height of the detection unit 206 according to the actual measurement of the image plane to select the best position to obtain the most ideal spectral image. In this device, a first pad 215 is added between the frame seat 214 and the preset shell 207. The first pad 215 is designed as a plurality of pads of different thicknesses. In the installation and adjustment process, the first pad 215 of the best thickness is selected according to the actual measured image plane position to ensure that the detection unit 206 is in the optimal position corresponding to the image plane. Exemplarily, with a thickness of 0.05 mm as the adjustment amount, for example, the first pads 215 with thicknesses of 0.95 mm, 1.0 mm, 1.05 mm, etc. may be included.

[0055] In some embodiments, the first gasket 215 is an insulating gasket, and the thermal conductivity of the first gasket 215 is lower than a preset value, so that the first gasket 215 has a lower thermal conductivity. By using the first gasket 215 in this way, while reducing the direct contact area between the frame seat 214 and the preset shell 207, it can effectively reduce the heat transfer between the two, thereby ensuring the overall thermal stability of the optical component and preventing the optical element from being deformed by temperature changes. This is an important design guarantee for the high precision and continuous stability of the entire machine.

[0056] After the lens group 204 and the reflective surface 203 are installed in the cavity of the preset housing 207 , they can be limited and fastened by the pressing ring 216 .

[0057] The preset housing 207 serves as the main frame of the spectrum module 211. The slit 201, the lens group 204, the reflective surface 203, and the light splitting part 202 are all installed in the preset housing 207. After each component is encapsulated in the preset housing 207, it can be used as a complete and independent optical component. The position of the components in the component is fixed, the light propagation path is confirmed, and the position of the optical component will not be disturbed by other external components and the assembly process, ensuring the high precision and high reliability requirements of the optical components of the whole machine. The encapsulated imaging module component (i.e., the imaging module component formed by the circuit board, the detection part, the filter, the filter seat and the frame seat) is integrated at the front end mating surface of the optical component.

[0058] In some embodiments, the spectral imaging device may also include a front shell 103 and a middle shell 210 that are connected to each other, the lens 101 is arranged in the front shell 103, the spectroscopic unit 202, the reflecting surface 203 and the detection unit 206 are arranged in the middle shell 210; the detection unit 206 is arranged on a circuit board 212, the circuit board 212 is at least partially a heat dissipation area, the front shell 103 is provided with a heat dissipation part, and the heat dissipation area of ​​the circuit board 212 is in contact with the heat dissipation part of the front shell 103.

[0059] The detection unit 206 of the spectral imaging device has a fast shooting rate, a large amount of data running, and a relatively high heat generation. Therefore, a heat dissipation area is reserved for the circuit board 212. The heat dissipation area can be reserved and designed on the top layer of the circuit board 212 so that the heat dissipation area of ​​the circuit board 212 is in contact with the heat dissipation part of the front shell 103, and the heat generated by the detection unit 206 is transferred to the front shell 103 by heat conduction, and is transferred and dissipated by convection and thermal radiation, thereby ensuring the reliable stability of the imaging of the detection unit 206. In some embodiments, the heat dissipation part of the front shell 103 includes a convex portion 107 that is arranged on the end face of the front shell 103 away from the middle shell 210 and protrudes outward, and the inner cavity formed by the convex portion 107 is connected to the front shell 103. The cavity-type convex portion is arranged on the end face of the front shell 103 to increase the heat dissipation area. A plurality of convex portions 107 arranged side by side can be arranged so that the heat generated by the detection unit 206 is transferred to the front shell 103 and is transferred and dissipated by convection and thermal radiation. For example, reference may be made to Figure 4, which is a schematic diagram of the overall structure of a spectral imaging device provided in one embodiment. As shown in the figure, a plurality of protrusions 107 arranged side by side are provided on the front end face of the front shell of the front shell module 1, and the inner cavity formed by the protrusions 107 is connected to the front shell 103.

[0060] In some embodiments, an adapter ring 104 is provided on the front housing 103, and the adapter ring 104 is used to install the lens 101. The lens 101 can be screwed and installed on the adapter ring 104, which is convenient for disassembling and replacing the lens 101. The adapter ring 104 can be a standard C-mount adapter ring.

[0061] In some embodiments, the spectral imaging device may further include a camera module 102 for acquiring a large field of view image of the outside world, the large field of view image being used to display on the platform and locate the position of the spectral imaging line in the large field of view image. The field of view of the camera module 102 in the spatial dimension is greater than the field of view of the lens 101 in the spatial dimension, so that the position of the spectral imaging line can be matched and located in the large field of view image obtained by the camera module 102. When the spectral imaging device is integrated on the drone platform, the user cannot reserve observations on the monitoring target and the imaging field of view area due to the imaging principle when the drone is not taking off. Therefore, the camera module 102 is set to obtain a large field of view image, which can be previewed through the platform. The imaging video window of the camera module 102 matches and locates the position of the spectral imaging line, so that the user can make an operation judgment, and the camera module 102 plays a role in assisting monitoring and realizing the function of imaging preview. The lens field of view of the camera module 102 can be matched with the field of view of the lens 101, and the user can view and confirm the central field of view of the spectral imaging through the video preview. The camera module 102 may be, but is not limited to, an RGB module or an RGB high-definition camera.

[0062] In some embodiments, the camera module 102 is arranged on the front shell 103, and the front shell 103 is also provided with a window. The camera module 102 is arranged corresponding to the window so that light from the outside enters the camera module 102 after passing through the window. The lens 101, the camera module 102 and the front shell 103 constitute the front shell module 1. For example, reference can be made to Figures 4 and 5. Figure 5 is a structural explosion diagram of a spectral imaging device provided by an embodiment. The front end surface of the front shell 103 is provided with an adapter ring 104 and a window, and the lens 101 is installed on the adapter ring 104. A window sheet 105 is provided in the window, and the window sheet 105 is used to protect the camera module 102. In some embodiments, a second gasket 106 is provided between the window sheet 105 and the camera module 102, and the second gasket 106 plays a sealing role, so that the front end of the lens of the camera module 102 is clean and dust-free, and dust is prevented from entering the front end of the lens of the camera module 102, affecting the monitoring video imaging. In some embodiments, the window sheet 105 can be fixed to a designated groove of the concave cavity in the front housing 103 by adhesive. The window sheet 105 can be glass, and the adhesive can be, but is not limited to, 3M adhesive.

[0063] In some embodiments, the spectral imaging device may also include a rear housing 307 and a main control board 302, wherein the main control board 302 is disposed in the rear housing 307, and the rear housing 307 is provided with a heat dissipation surface, and the high-heat components of the main control board 302 are bonded to the heat dissipation surface through a heat-conducting medium, and heat dissipation fins are provided on the outer side of the rear housing 307. The high frame rate and high computing power of the spectral imaging device cause a large amount of heat generation of components such as the CPU, and the temperature rises. A heat dissipation matching reference surface (i.e., heat dissipation surface) is designed in the corresponding area of ​​the high-heat components of the main control board 302 on the inner side of the rear housing 307, and the high-heat components such as the CPU on the main control board 302 are tightly bonded to the heat dissipation reference surface through a heat-conducting medium to reduce the interface gap and reduce the contact thermal resistance. The rear housing 307 is designed above the heat dissipation of the main control board 302, and the rear housing 307 can be made of a material with strong thermal conductivity. In order to increase the heat dissipation area and enhance the heat radiation effect, heat dissipation fins are arranged on the outer side of the rear housing 307. By designing a complete heat dissipation path of high-heat device-interface material-heat dissipation rear housing-external environment, the heat of components such as the CPU is transferred and dissipated to the environment, effectively ensuring the temperature rise of components such as the CPU in the main control board 302, and meeting the application requirements of high frame rate operation and high performance and stable operation of the imaging device. The heat conducting medium can be, but is not limited to, the interface material such as thermal conductive silicone grease.

[0064] In some embodiments, the spectral imaging device may also include a rear shell 307, a base plate 301 and a main control board 302, wherein the base plate 301 and the main control board 302 are arranged in the rear shell 307, and the main control board 302 is connected to the base plate 301 through an inter-board connector, and the base plate 301 is provided with a connector and a corresponding external interface 303, and the cable led out of the detection unit 206 is connected to the connector. The base plate 301, the main control board 302 and the rear shell 307 constitute the rear shell module 3. As shown in FIG. 1, the base plate 301 is provided with a connector and a corresponding external interface 303, and can be connected to a power supply module 304 or / and a signal control module 305 or / and a data transmission and storage module 306 externally, and realizes data interaction and signal control with platforms such as drones through connectors and plug-ins externally. When the rear shell module 3 is installed, the cable led out of the front-end module is inserted into the corresponding connector of the base plate 301.

[0065] The bottom plate 301 is used to realize the power conversion of the device and the interconnection between the main control board 302 and the interfaces of each functional unit. The main control board 302 is the core computing board, which mainly performs the computing and processing of spectral data to realize the core performance and functional indicators of the imaging device. The main control board 302 and the bottom plate 301 can be interconnected through the inter-board connector and installed in the rear housing 307 as a whole circuit board electric control board, and the bottom plate 301 can be fixed to the rear housing 307 by screws to form the rear housing module 3. The main control board 302 can adopt a printed circuit board assembly (PCBA).

[0066] In some embodiments, an indicator light column 308 is provided on the rear shell 307. The indicator light column 308 is used to display different colors in real time according to the operating status of the spectral imaging device. The user can judge the device status and perform self-check of problems by changing the light color of the indicator light column 308. The indicator light column 308 can display the current operating status of the device in real time and optimize human-computer interaction.

[0067] The spectral imaging device includes a front shell module 1, a middle shell module 2 and a rear shell module 3. The functional areas of the modules are reasonably divided. The three modules realize the main protection support of the spectral imaging device, and the device is simply divided into three parts according to the function and assembly process. The modular design of the whole machine can simplify the assembly process and improve the assembly efficiency while reducing the cost.

[0068] The front housing module 1 is the main spectrum collection component in the entire imaging device.

[0069] An independent spectral module 211 is integrated inside the middle shell module 2, and the spectral module 211 is the main optical imaging component. The spectral module 211 adopts a "W"-shaped propagation optical path, which can effectively reduce the longitudinal transmission length of the optical path and effectively compress the length of the entire optical imaging component, thereby ensuring the volume of the entire imaging device and realizing a light and small design. At the same time, the internal optical elements of the spectral module 211 are simple in shape and do not require complex and strange structures, which can effectively reduce the difficulty of processing and reduce costs. At the same time, the assembly of optical elements can be completed by gluing to the pressure ring and the spacer ring method, without complex assembly and adjustment process requirements, simplifying the assembly process and reducing the difficulty of assembly and adjustment. The middle shell 210 is the main support frame of the spectral imaging device. The assembled spectral module 211 is installed in the middle shell 210 to form the middle shell module 2. The front shell module 1 and the rear shell module 3 are respectively installed at the front and rear ends of the middle shell module 2.

[0070] The rear shell module 3 is the integrated area of ​​the hardware circuit board in the entire imaging device. On the one hand, the rear shell 307 realizes the supporting and protective function, and is used to integrate and fix various circuit boards. It is the hardware guarantee for achieving functional indicators and high reliability and stability; on the other hand, it realizes efficient heat dissipation and meets the heat dissipation demand indicators. Through the rear shell 307 and the heat dissipation design, efficient heat transfer and dissipation are achieved.

[0071] In some embodiments, the stopper of the front housing 103 cooperates with the stopper of the middle housing 210 during assembly, and the front housing 103 and the middle housing 210 can be integrated by screws. In some embodiments, the stopper of the rear housing 307 cooperates with the stopper of the middle housing 210 during assembly, and the rear housing 307 and the middle housing 210 can be integrated by screws.

[0072] The spectral imaging device of this embodiment adopts a lightweight structural design, which is small in size and light in weight. It can be adapted to different drones and platform integrations, and has strong compatibility. The imaging spectrum has high resolution and strong stability, and is suitable for multiple scenarios such as scientific research and industry. The optical system is designed as a "W"-shaped propagation optical path. The functional components of the spectral imaging device of this embodiment are modularly designed, modularly assembled, and tested, which simplifies the assembly process, improves production efficiency, and reduces costs. The design package is an independent and complete spectral module, which can effectively ensure the accuracy and stability of optical components while reducing the difficulty of assembly and adjustment, and avoid the influence of other external components and operating procedures on the performance of optical components, and has continuous high stability.

[0073] The above is a detailed introduction to a spectral imaging device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A spectral imaging device, characterized in that: It includes a lens, a reflective surface, a spectroscopic part and a detection part, wherein the lens is used to obtain light from the outside and make the obtained light incident on the reflective surface; The reflecting surface, the spectroscopic part and the detecting part are assembled as a whole, the spectroscopic part is arranged opposite to the reflecting surface, the reflecting surface is used to reflect the light to the spectroscopic part, the spectroscopic part is used to split the light to generate spectroscopic light beams of different spectra, the generated spectroscopic light beams are incident on the reflecting surface, the reflecting surface is also used to reflect the spectroscopic light beams so that the reflected spectroscopic light beams are incident on the detecting part, and the detecting part is used to generate an electrical signal based on the received light.

2. The spectral imaging device according to claim 1, characterized in that: It also includes a slit and a lens group, wherein the slit, the lens group, the reflecting surface, the light splitting part and the detection part are integrally assembled; The slit is used to allow the light from the lens to pass through, so that the light is incident on the reflecting surface; The lens group is arranged between the spectroscopic part and the reflecting surface, the light from the lens passes through the lens group and then is incident on the reflecting surface, the reflecting surface reflects the light so that the reflected light passes through the lens group and then is incident on the spectroscopic part, and the spectroscopic light beam generated by the spectroscopic part passes through the lens group and then is incident on the reflecting surface, and the spectroscopic light beam reflected by the reflecting surface passes through the lens group and then is incident on the detection part.

3. The spectral imaging device according to claim 2, characterized in that: The present invention also includes a preset shell, which is provided with a cavity, the lens group and the reflecting surface are arranged in the cavity, the slit, the light splitting part and the light opening are arranged at one end of the preset shell, the detection part is arranged outside the preset shell and the detection part is arranged corresponding to the light opening, so that the light passing through the slit enters the cavity, is incident on the lens group and passes through the lens group before being incident on the reflecting surface, and the light splitting light beam reflected by the reflecting surface and passing through the lens group passes through the light opening before being incident on the detection part.

4. The spectral imaging device according to claim 3, characterized in that: It also includes a circuit board, a filter, a filter seat and a frame seat, the detection part is arranged on the circuit board, the filter is installed on the filter seat, the filter seat is installed on the circuit board, so that the filter is located on the side of the detection part that receives light, the circuit board is installed on the frame seat, and the frame seat is connected to one end of the preset shell, so that the detection part and the light opening are arranged correspondingly.

5. The spectral imaging device according to claim 3, characterized in that: It also includes a circuit board, a frame seat and a first gasket, the detection part is arranged on the circuit board, the circuit board is mounted on the frame seat, the frame seat is connected to one end of the preset housing, so that the detection part is arranged corresponding to the light opening; The first pad is used to be arranged between the frame seat and the end of the preset shell, and the first pad includes a plurality of first pads of different thicknesses, so that the position of the detection part can be changed by replacing the first pads of different thicknesses so that the detection part corresponds to the image plane.

6. The spectral imaging device according to claim 1, characterized in that: It also includes a front shell and a middle shell connected to each other, the lens is arranged in the front shell, and the light splitting part, the reflecting surface and the detection part are arranged in the middle shell; The detection part is arranged on a circuit board, at least a part of the circuit board is a heat dissipation area, the front housing is provided with a heat dissipation part, and the heat dissipation area of ​​the circuit board contacts the heat dissipation part of the front housing.

7. The spectral imaging device according to claim 1, characterized in that: It also includes a front housing, on which an adapter ring is provided, and the adapter ring is used to install the lens; The spectral imaging device also includes a camera module for acquiring a large field of view image of the outside world. The camera module is arranged on the front shell body. The front shell body is also provided with a window. The camera module is arranged corresponding to the window so that light from the outside world enters the camera module after passing through the window.

8. The spectral imaging device according to claim 1, characterized in that: It also includes a rear shell and a main control board. The main control board is arranged in the rear shell. The rear shell is provided with a heat dissipation surface. The high-heat device of the main control board is bonded to the heat dissipation surface through a heat-conducting medium. Heat dissipation fins are arranged on the outer side of the rear shell.

9. The spectral imaging device according to claim 1, characterized in that: It also includes a rear shell, a base plate and a main control board, wherein the base plate and the main control board are arranged in the rear shell, the main control board and the base plate are connected to each other through an inter-board connector, the base plate is provided with a connector and a corresponding external interface, and the cable led out of the detection part is connected to the connector.

10. The spectral imaging device according to claim 1, characterized in that: It also includes a camera module for acquiring a large-field-of-view image of the outside world. The large-field-of-view image is used to be displayed on the platform and to locate the position of the spectral imaging spectrum line in the large-field-of-view image.

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