Multispectral Camera

Abstract

The utility model provides a multi-spectral camera, comprising a base, a lens assembly, a light valve assembly and a photosensitive assembly, wherein the lens assembly is mounted on the base, the lens assembly forms an optical axis, the lens assembly has an image side at one end of the optical axis, the light valve assembly is mounted on the base and arranged on one side of the image side, the light valve assembly comprises an incident grating portion, a liquid crystal portion and an exit grating portion which are sequentially stacked along the extension direction of the optical axis, the incident grating portion, the liquid crystal portion and the exit grating portion jointly form a plurality of light filtering channels, the plurality of light filtering channels are arranged at intervals, each light filtering channel is used to filter a light signal, the photosensitive assembly is mounted on the base and is located on a side of the light valve assembly away from the lens assembly, the photosensitive assembly forms a plurality of light sensing areas, the plurality of light sensing areas are arranged in one-to-one correspondence with the plurality of light filtering channels, each light sensing area is used to obtain a light signal filtered by the light filtering channel and is suitable for converting the light signal into an electrical signal, thereby improving the spectral resolution and imaging quality of the spectral camera.

Description

Technical Field

[0001] The utility model relates to the technical field of spectral imaging, in particular to a multi-spectral camera. Background Art

[0002] A multispectral camera is a camera that can simultaneously image the same scene using several bands, and can obtain not only the image information of the target, but also the spectral information of the target. In related technologies, multispectral cameras usually use filters for spectral selection. Usually, filters have a wide bandwidth, which will affect the spectral resolution and imaging quality of multispectral cameras. Utility Model Content

[0003] The embodiment of the utility model provides a multispectral camera, which can improve the problem that the filter used in the multispectral camera in the related art has a wide bandwidth, which affects the spectral resolution and imaging quality of the multispectral camera.

[0004] In a first aspect, an embodiment of the present invention provides a multi-spectral camera.

[0005] In one embodiment, a multispectral camera comprises:

[0006] Pedestal;

[0007] A lens assembly mounted on the base, the lens assembly forming an optical axis, the lens assembly having an image side at one end of the optical axis;

[0008] a light valve assembly mounted on the base and disposed on one side of the image side, the light valve assembly being on the optical axis, the light valve assembly comprising an incident grating portion, a liquid crystal portion and an exit grating portion stacked in sequence along an extension direction of the optical axis, the incident grating portion, the liquid crystal portion and the exit grating portion jointly forming a plurality of light filtering channels, the plurality of light filtering channels being arranged at intervals, and each of the light filtering channels being used to filter the optical signal;

[0009] A photosensitive component is installed on the base and is located on the side of the light valve component away from the lens component. The photosensitive component is on the optical axis. The photosensitive component is formed with multiple photosensitive areas. The multiple photosensitive areas are arranged in a one-to-one correspondence with the multiple filtering channels. Each of the photosensitive areas is used to obtain the optical signal filtered by the filtering channel and is suitable for converting the optical signal into an electrical signal.

[0010] In one embodiment, the liquid crystal portion has a plurality of liquid crystal regions and a plurality of non-liquid crystal regions, and the plurality of liquid crystal regions and the plurality of non-liquid crystal regions are alternately arranged;

[0011] The incident grating section and the exit grating section each include a plurality of metal grating strips arranged at intervals, and along the extension direction of the optical axis, the orthographic projections of the plurality of metal grating strips of the liquid crystal section at least partially overlap with the non-liquid crystal region, an incident channel is formed between two adjacent metal grating strips of the incident grating section, and an exit channel is formed between two adjacent metal grating strips of the exit grating section, and each of the incident channels and each of the exit channels correspond to the liquid crystal region, so that the incident channels, the exit channels and the liquid crystal region are suitable for jointly constituting the light filtering channel. In one embodiment, a circuit board is further included, the circuit board is mounted on the base, and is provided with a plurality of connection areas, the plurality of connection areas are arranged in a one-to-one correspondence with the plurality of photosensitive regions, and each of the connection areas is electrically connected to the corresponding photosensitive region.

[0012] In one embodiment, the circuit board is electrically connected to the light valve assembly.

[0013] In one embodiment, the circuit board is disposed on a side of the photosensitive component away from the lens component;

[0014] The multi-spectral camera further comprises a connecting member, one end of which is electrically connected to the light valve assembly, and the other end of which is electrically connected to the circuit board.

[0015] In one embodiment, two ends of the connecting member are respectively fixed to the light valve assembly and the circuit board by welding.

[0016] In one embodiment, along the optical axis direction, the orthographic projection of the light valve assembly and the orthographic projection of the photosensitive assembly are both within the orthographic projection of the circuit board.

[0017] In one embodiment, the base is formed with a receiving cavity, and the base is provided with a through hole communicating with the receiving cavity;

[0018] The image side of the lens assembly is connected to the base, and the optical axis is arranged colinearly with the axis of the through hole;

[0019] The light valve assembly and the photosensitive assembly are both installed in the accommodating cavity.

[0020] In one embodiment, the lens assembly includes a first lens barrel and a second lens barrel, and the adjacent ends of the first lens barrel and the second lens barrel are movably mounted so that the ends of the first lens barrel and the second lens barrel facing away from each other are suitable for approaching or moving away from each other, wherein lenses are installed in the ends of the first lens barrel and the second lens barrel facing away from each other.

[0021] In one embodiment, a plurality of the light valve assemblies are provided, and the plurality of light valve assemblies are stacked in sequence along the extending direction of the optical axis.

[0022] Beneficial effects of the embodiments of the utility model:

[0023] In an embodiment of the utility model, the lens assembly is formed with an optical axis, and the lens assembly has an image side at one end of the optical axis, so that it helps to ensure that the light can propagate along a predetermined path when passing through the lens. Each filter channel can perform specific filtering on the optical signal, thereby realizing the separation of different spectral bands. This design enables the multi-spectral camera to capture spectral information of multiple different bands at the same time, greatly enriching the information content of the imaging. The liquid crystal part, as the core part of the light valve assembly, has flexible optical properties. By adjusting the state of the liquid crystal part, the characteristics of the filter channel can be changed to realize the filtering requirements of different spectral bands. The incident grating part, the liquid crystal part and the exit grating part are integrated into a light valve assembly, making the entire camera system more compact and efficient. This design not only reduces the size of the camera, but also improves the stability and reliability of the multi-spectral camera. The filter channels are arranged at intervals, which helps to reduce the interference of optical signals between different channels and improve the clarity and accuracy of imaging. At the same time, the interval setting also enables each filter channel to work independently without interfering with each other, further improving the performance of the multi-spectral camera. Due to the precise design of the light valve assembly and the optimized configuration of the filter channel, the camera can efficiently filter and separate the light signal. This helps to obtain more accurate and reliable spectral information, providing strong support for subsequent data analysis and processing. The photosensitive component is formed with multiple photosensitive areas, and each photosensitive area is set in a one-to-one correspondence with the filter channel in the light valve assembly. This design enables each photosensitive area to accurately capture the light signal after filtering by a specific filter channel. Due to the existence of the filter channel, the multispectral camera can capture spectral information of multiple different bands at the same time. This means that the photosensitive component can process data from multiple spectral bands at the same time, improving the spectral resolution and imaging quality of the multispectral camera. Each photosensitive area is designed to convert the captured light signal into an electrical signal, which can ensure high efficiency and good accuracy in converting the light signal into an electrical signal, reduce data loss and noise interference, and improve the clarity and accuracy of the imaging. Since the photosensitive area and the filter channel are set in a one-to-one correspondence, the precise matching of the light signal from the filter channel to the photosensitive area is ensured. This precise matching reduces the loss and interference during signal transmission and improves the overall efficiency of the system. At the same time, the photosensitive area is located on the optical axis, which ensures that the light signal can be transmitted directly and accurately to the photosensitive area, further improving the transmission efficiency and imaging quality of the multispectral camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 is a schematic structural diagram of a multi-spectral camera provided in an embodiment of the utility model;

[0026] Figure 2 This is one of the structural schematic diagrams of the light valve assembly provided by the embodiment of the utility model;

[0027] Figure 3 This is the second structural schematic diagram of the light valve assembly provided by the embodiment of the utility model;

[0028] Figure 4 It is a three-dimensional schematic diagram of a light valve assembly (liquid crystal deflection) provided in an embodiment of the utility model;

[0029] Figure 5 yes Figure 3 A left side view of the filter unit shown;

[0030] Figure 6 yes Figure 3 A right side view of the filter unit shown;

[0031] Figure 7 It is a three-dimensional schematic diagram of a light valve assembly (liquid crystal not deflected) provided in an embodiment of the utility model.

[0032] Description of Figure Numbers:

[0033] 10. Multispectral camera;

[0034] 11. base, 111. accommodating cavity;

[0035] 12. lens assembly, 121. optical axis, 122. first lens barrel, 123. second lens barrel;

[0036] 13. light valve assembly, 131. incident grating portion, 132. liquid crystal portion, 1321. liquid crystal, 1322. main body, 1323. liquid crystal unit, 13241. positive pole, 13242. negative pole, 133. exit grating portion, 1311. metal grating strip;

[0037] 14. Circuit board;

[0038] 15. Connectors;

[0039] 16. Photosensitive component. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0041] Combine the following Figures 1 to 7 A multispectral camera 10 of the present application is described.

[0042] Reference Figures 1 to 3 The multispectral camera 10 includes a base 11, a lens assembly 12, a light valve assembly 13 and a photosensitive assembly 16. The lens assembly 12 is mounted on the base 11. The lens assembly 12 forms an optical axis 121. The lens assembly 12 has an image side at one end of the optical axis 121. The light valve assembly 13 is mounted on the base 11 and is arranged on one side of the image side. The light valve assembly 13 is on the optical axis 121. The light valve assembly 13 includes an incident grating portion 131, a liquid crystal portion 132 and an exit grating portion 133 which are sequentially stacked along the extension direction of the optical axis 121. The incident grating portion 13 1. The liquid crystal portion 132 and the output grating portion 133 jointly form a plurality of filter channels, which are arranged at intervals. Each filter channel is used to filter the optical signal. The photosensitive component 16 is installed on the base 11 and is located on the side of the light valve component 13 away from the lens component 12. The photosensitive component 16 is on the optical axis 121. The photosensitive component 16 forms a plurality of photosensitive areas, which are arranged one by one with the plurality of filter channels. Each photosensitive area is used to obtain the optical signal filtered by the filter channel and is suitable for converting the optical signal into an electrical signal.

[0043] In an embodiment of the utility model, the lens assembly 12 is formed with an optical axis 121, and the lens assembly 12 has an image side at one end of the optical axis 121, so that it helps to ensure that the light can propagate along a predetermined path when passing through the lens, so that the multi-spectral camera 10 can obtain clear and accurate imaging. Each filter channel can perform specific filtering on the optical signal, thereby realizing the separation of different spectral bands. This design enables the multi-spectral camera 10 to capture spectral information of multiple different bands at the same time, greatly enriching the information content of the imaging. The liquid crystal part 132, as the core part of the light valve assembly 13, has flexible optical properties. By adjusting the state of the liquid crystal part 132, the characteristics of the filter channel can be changed to realize the filtering requirements of different spectral bands. The incident grating part 131, the liquid crystal part 132 and the exit grating part 133 are integrated in a light valve assembly 13, making the entire camera system more compact and efficient. This design not only reduces the size of the camera, but also improves the stability and reliability of the system. The filter channels are arranged at intervals, which helps to reduce the interference of optical signals between different channels and improve the clarity and accuracy of imaging. At the same time, the interval setting also enables each filter channel to work independently without interfering with each other, further improving the performance of the multi-spectral camera 10. Due to the precise design of the light valve assembly 13 and the optimized configuration of the filter channel, the camera can efficiently filter and separate the optical signal. This helps to obtain more accurate and reliable spectral information, and provides strong support for subsequent data analysis and processing. The photosensitive component 16 is formed with multiple photosensitive areas, and each photosensitive area is set in a one-to-one correspondence with the filter channel in the light valve assembly 13. Such a design enables each photosensitive area to accurately capture the optical signal filtered by a specific filter channel. Due to the existence of the filter channel, the multi-spectral camera 10 can capture spectral information of multiple different bands at the same time. This means that the photosensitive component 16 can process data of multiple spectral bands at the same time, improving the spectral resolution and imaging quality of the multi-spectral camera 10. Each photosensitive area is designed to convert the captured optical signal into an electrical signal, which can ensure that the optical signal is converted into an electrical signal with high efficiency and good accuracy, reduce data loss and noise interference, and improve the clarity and accuracy of imaging. Since the photosensitive area and the filter channel are set in a one-to-one correspondence, the optical signal is accurately matched from the filter channel to the photosensitive area. This accurate matching reduces the loss and interference in the signal transmission process and improves the overall efficiency of the system. At the same time, the photosensitive area is located on the optical axis 121, which ensures that the optical signal can be directly and accurately transmitted to the photosensitive area, further improving the transmission efficiency and imaging quality of the multi-spectral camera 10.

[0044] Reference Figures 4 to 7In some embodiments, the liquid crystal portion 132 has a plurality of liquid crystal regions and a plurality of non-liquid crystal regions, and the plurality of liquid crystal regions and the plurality of non-liquid crystal regions are alternately arranged. The incident grating portion 131 and the exit grating portion 133 each include a plurality of metal grating strips 1311 arranged at intervals. Along the extension direction of the optical axis 121, the orthographic projections of the plurality of metal grating strips 1311 in the liquid crystal portion 132 at least partially overlap with the non-liquid crystal regions. An incident channel is formed between two adjacent metal grating strips 1311 of the incident grating portion 131, and an exit channel is formed between two adjacent metal grating strips 1311 of the exit grating portion 133. Each incident channel and each exit channel corresponds to a liquid crystal region, thus ensuring the stability and accuracy of the optical signal during transmission. Since the incident channel, the exit channel and the liquid crystal region are suitable for jointly forming a filter channel, thus ensuring the accurate separation and filtering of the optical signal by the filter channel.

[0045] Reference Figure 5 In one embodiment, the multiple metal grating strips 1311 of the incident grating portion 131 are arranged at equal intervals, and each metal grating strip 1311 is extended along the second direction. In this way, the metal grating strips 1311 arranged at equal intervals can ensure that the light signal is uniformly diffracted or reflected, thereby achieving accurate spectral separation. This uniform spacing helps to maintain the continuity and consistency of the spectrum and improve the accuracy of spectral imaging. The metal grating strips 1311 usually have a high diffraction efficiency, which means that more light signals can be effectively guided to the subsequent light valve assembly 13. High diffraction efficiency helps to improve the sensitivity and signal-to-noise ratio of spectral imaging. The metal grating strips 1311 have good mechanical stability and thermal stability, and can resist a certain degree of temperature changes and mechanical vibrations. This allows the incident grating portion 131 to maintain stable performance under various environmental conditions. The metal grating strips 1311 arranged at equal intervals can be manufactured using standard micro-nano processing technologies, such as photolithography, electron beam exposure, etc. These technologies can ensure that the grating portion has high precision and consistency performance.

[0046] Reference Figure 6In one embodiment, the plurality of metal grating strips 1311 of the exit grating portion 133 are arranged at equal intervals, and each metal grating strip 1311 is extended along a third direction, the third direction is perpendicular to the extension direction of the optical axis 121, and the third direction is also perpendicular to the second direction. Since the third direction is perpendicular to both the extension direction of the optical axis 121 and the second direction, this design provides the ability to separate spectral signals in another direction. This increases the dimension of spectral imaging, allowing the multi-spectral camera 10 to capture richer spectral information. The metal grating strips 1311 arranged at equal intervals help to achieve more uniform spectral separation, thereby improving spectral resolution. This helps to more accurately identify and measure light signals of different wavelengths or frequencies. Since the grating strips of the incident grating portion 131 and the exit grating portion 133 extend in different directions, the interference between them is greatly reduced. This helps to maintain the clarity and accuracy of the spectral signal.

[0047] It should be noted that the spectral resolution and diffraction characteristics of the plurality of metal grating strips 1311 of the output grating portion 133 can be flexibly adjusted by adjusting parameters such as the width, interval and length of the metal grating strips 1311. Specifically, the present application does not limit this.

[0048] Reference Figure 1 In some embodiments, the multispectral camera 10 further includes a circuit board 14, which is mounted on the base 11 and is provided with a plurality of connection areas, which are arranged one by one with the plurality of photosensitive areas, and each connection area is electrically connected to the corresponding photosensitive area, so that the light signal (converted into an electrical signal) captured from the photosensitive area can be quickly and accurately transmitted to the corresponding position on the circuit board 14. This direct connection reduces the loss and interference during signal transmission and ensures the integrity and accuracy of the data. In addition, if a photosensitive area or connection area fails, it can be repaired or replaced directly on the circuit board 14 without disassembling the entire camera system, thereby reducing the maintenance cost and maintenance time.

[0049] It should be noted that the connection area on the circuit board 14 is usually designed with low impedance and high bandwidth, so as to reduce noise and interference during signal transmission.

[0050] Continue to refer to Figure 1 In some embodiments, the circuit board 14 is electrically connected to the light valve assembly 13, so that high-speed signal transmission can be achieved. The electrical connection method can reduce interference and loss of signals during transmission and ensure signal stability and accuracy.

[0051] Refer again Figure 1In some embodiments, the circuit board 14 is disposed on the side of the photosensitive component 16 away from the lens component 12, and the multi-spectral camera 10 further includes a connector 15, one end of the connector 15 is electrically connected to the light valve component 13, and the other end is electrically connected to the circuit board 14. In this way, placing the circuit board 14 on the other side of the photosensitive component 16 can optimize the spatial layout inside the camera, make the overall structure more compact, and reduce the volume of the multi-spectral camera. The connector 15 serves as a bridge between the light valve component 13 and the circuit board 14, ensuring that the control signal generated by the light valve component 13 can be quickly and accurately transmitted to the circuit board 14. The use of the connector 15 simplifies the connection process between the light valve component 13 and the circuit board 14, and reduces the difficulty and complexity of assembly. At the same time, during maintenance, the problem can be quickly located and repaired by simply disconnecting or reconnecting the two through the connector 15, thereby improving maintenance efficiency.

[0052] There are many ways to realize that one end of the connector 15 is electrically connected to the light valve assembly 13 and the other end is electrically connected to the circuit board 14. For example, in one embodiment, the two ends of the connector 15 are designed as plugs or sockets, which match the sockets or plugs on the light valve assembly 13 and the circuit board 14 respectively. In another embodiment, a dedicated cable or wire is used, one end of which is connected to the circuit node of the light valve assembly 13 and the other end is connected to the corresponding node of the circuit board 14. In the embodiment of the present application, the two ends of the connector 15 are welded and fixed to the light valve assembly 13 and the circuit board 14 respectively. In this way, welding and fixing between the light valve assembly 13 and the circuit board 14 can ensure that the connection between the two will not loosen or break due to the influence of the external environment (such as vibration, temperature change, etc.), thereby ensuring the stability of the camera operation. Welding can achieve direct contact between metals, thereby ensuring good electrical conductivity. Between the light valve assembly 13 and the circuit board 14, good electrical conductivity is the key to ensuring signal transmission efficiency and accuracy. Welding and fixing can reduce signal attenuation or distortion caused by poor contact and improve the performance of the multi-spectral camera 10.

[0053] Reference Figure 1 In one embodiment, along the direction of the optical axis 121, the orthographic projection of the light valve assembly 13 and the orthographic projection of the photosensitive assembly 16 are both within the orthographic projection of the circuit board 14, which helps to optimize the spatial layout inside the camera. Through a compact layout, the overall volume of the multi-spectral camera 10 can be reduced, while ensuring that the relative positions of the various components are reasonable, which facilitates signal transmission and connection. Since the light valve assembly 13 and the photosensitive assembly 16 are both within the effective projection range of the circuit board 14, the connection distance between them and the circuit board 14 can be shortened, thereby reducing the attenuation and interference of the signal during the transmission process. This helps to improve the efficiency of signal transmission and ensure that the multi-spectral camera 10 can respond quickly and accurately during operation.

[0054] Continue to refer to Figure 1In some embodiments, the base 11 is formed with a housing cavity 111, the base 11 is provided with a through hole connected to the housing cavity 111, the image side of the lens assembly 12 is connected to the base 11, and the optical axis 121 is arranged in a collinear manner with the axis of the through hole, and the light valve assembly 13 and the photosensitive assembly 16 are both installed in the housing cavity 111. In this way, by forming the housing cavity 111 inside the base 11 and installing the light valve assembly 13 and the photosensitive assembly 16 therein, the internal structure of the multi-spectral camera 10 is made compact. This design reduces the overall volume of the multi-spectral camera 10 and ensures the rationality of the relative positions between the components. The image side of the lens assembly 12 is connected to the base 11, and the optical axis 121 is arranged in a collinear manner with the axis of the through hole, which ensures that after the light enters the multi-spectral camera 10 from the lens assembly 12, it can directly and accurately enter the light valve assembly 13 and the photosensitive assembly 16 in the housing cavity 111 through the through hole. This design avoids refraction and reflection of light inside the multispectral camera 10 , reduces light loss and interference, and thus improves imaging quality and clarity.

[0055] Reference Figure 1 In some embodiments, the lens assembly 12 includes a first lens barrel 122 and a second lens barrel 123, and the adjacent ends of the first lens barrel 122 and the second lens barrel 123 are movably sleeved so that the ends of the first lens barrel 122 and the second lens barrel 123 that are separated from each other are suitable for being close to or away from each other, wherein lenses are installed in the ends of the first lens barrel 122 and the second lens barrel 123 that are separated from each other, so that the two lens barrels are allowed to move relative to each other on the optical axis 121 through the movable sleeve design of the adjacent ends of the first lens barrel 122 and the second lens barrel 123, thereby changing the focal length of the entire lens assembly 12, so that the multi-spectral camera 10 can shoot scenes at different distances without sacrificing image quality. Since lenses are installed in the first lens barrel 122 and the second lens barrel 123, and the focal length can be changed by relative movement, this design can be used to adjust the depth of field effect. When the two lens barrels are close to each other, the focal length of the lens becomes shorter, the depth of field increases, and more scenes are in a clear state; and when the two lens barrels are away from each other, the focal length of the lens becomes longer, the depth of field decreases, and the effect of blurring the background can be achieved. Through the design of the movable sleeve, the first lens barrel 122 and the second lens barrel 123 can adjust the focal length without increasing the overall length of the lens assembly 12. This design allows the lens assembly 12 to have a high degree of flexibility and adaptability while maintaining a compact structure. At the same time, since the two lens barrels are movable sleeves at one end adjacent to each other, the adjustment of the focal length can be achieved through a simple mechanical structure, reducing manufacturing cost and complexity.

[0056] It should be noted that, since the lenses in the first lens barrel 122 and the second lens barrel 123 are precisely designed and manufactured, it is possible to ensure stable image quality throughout the entire zoom range.

[0057] In some embodiments, the lens includes a convex lens. In this way, since the convex lens has a strong focusing ability, it can focus the light on the same point, so that the image is clear. In the lens assembly 12, the focusing ability of the convex lens enables the light of the subject to be accurately focused on the photosensitive element to form a high-quality image. The refractive index of the convex lens is higher than that of air, which means that the speed of light will slow down when it propagates in the lens, causing the light to refract inside the lens. This high refractive index enables the convex lens to converge the light more effectively, thereby improving the brightness and clarity of the image.

[0058] Reference Figure 2 and Figure 3 In one embodiment, a plurality of light valve assemblies 13 are provided, and the plurality of light valve assemblies 13 are stacked in sequence along the extension direction of the optical axis 121. Thus, by stacking the plurality of light valve assemblies 13 along the extension direction of the optical axis 121, the space between the lens assembly 12 and the photosensitive assembly 16 can be fully utilized, thereby improving the space utilization rate of the entire camera or optical system. Stacking a plurality of light valve assemblies 13 can increase the control accuracy and flexibility of light. For example, by adjusting the switching states of different light valve assemblies 13, the passage of light of different spectral components can be controlled to achieve a specific optical effect. This design can also improve the imaging quality by optimizing the transmission and reflection of light and reducing problems such as optical distortion and chromatic aberration. Stacking a plurality of light valve assemblies 13 can reduce the overall size of the system, making the multi-spectral camera 10 more compact and portable.

[0059] Specifically, the light valve assembly 13 is composed of a liquid crystal portion 132, an incident grating portion 131, and an output grating portion 133, which can achieve accurate screening of different wavelength components in the optical signal. After the voltage is applied to the liquid crystal portion 132, its optical properties (such as refractive index) will change, so that it can selectively transmit or reflect light of a specific wavelength. By stacking multiple light valve assemblies 13 in sequence, the light signal will be screened by each light valve assembly 13 in sequence. This design can gradually narrow the wavelength range of the light signal, so that the output light signal has a narrower wavelength range, avoiding the overlap between adjacent bands in spectral imaging. The liquid crystal portion 132 can adjust its optical properties by applying different voltages, which makes the light valve assembly 13 highly flexible. By adjusting the voltage, accurate control of light signals of different wavelengths can be achieved to meet different application requirements. Since each light valve assembly 13 can accurately screen and adjust the light signal, the entire light valve assembly 13 has a higher resolution. This helps to improve the quality and accuracy of spectral imaging.

[0060] In one embodiment, when a voltage is applied to the liquid crystal parts 132 of the multiple light valve assemblies 13, the deflection angles of the liquid crystals 1321 of the liquid crystal parts 132 corresponding to the liquid crystal parts 132 of the multiple light valve assemblies 13 are different, so that part of the light signal filtered by one of the light valve assemblies 13 is suitable for being filtered by another light valve assembly 13. In this way, by adjusting the deflection angles of the liquid crystals 1321 of different liquid crystal parts 132, the transmission or reflection characteristics of each light valve assembly 13 for light signals of different wavelengths can be controlled. This continuous filtering design can more effectively separate and extract subtle spectral differences, thereby improving the resolution of spectral imaging. Since each light valve assembly 13 can filter for a specific spectral band, a wider spectral range can be covered by continuous filtering of multiple light valve assemblies 13. Through continuous filtering, each light valve assembly 13 can perform certain preprocessing on the light signal. This helps to reduce background noise, enhance target signals, etc., thereby improving the signal processing capability of the entire multi-spectral camera 10. Since each light valve assembly 13 can accurately filter a specific wavelength, the spectral image finally obtained will have higher clarity and accuracy. Since the deflection angle of the liquid crystal 1321 can be controlled by applying a voltage, the spectral characteristics of the light valve assembly 13 can be adjusted according to actual needs. This flexibility enables the multi-spectral camera 10 to adapt to different spectral imaging needs.

[0061] In one embodiment, the liquid crystal portion 132 includes an ultrafast ferroelectric liquid crystal. As such, the ultrafast ferroelectric liquid crystal is known for its sub-microsecond response speed, which means that when a voltage is applied, the rearrangement and deflection of the liquid crystal 1321 is almost instantaneous, thus greatly reducing the time required for the multi-spectral camera 10 to scan the band. In addition, the ultrafast ferroelectric liquid crystal allows the multi-spectral camera 10 to capture images at a higher frame rate, thereby providing smoother and more accurate dynamic spectral data. The ultrafast ferroelectric liquid crystal has excellent contrast performance and can achieve a clear transition between the bright state and the dark state. This enables the multi-spectral camera 10 to provide a clearer and easier to distinguish image when displaying spectral data. Due to the in-plane motion characteristics of the ultrafast ferroelectric liquid crystal, its viewing angle range is wider than that of conventional liquid crystals 1321. This means that no matter from which angle the observer views the imaging device, consistent and accurate image quality can be obtained. The bistable nature of the ultrafast ferroelectric liquid crystal enables it to maintain low power consumption when displaying static images. When the image remains unchanged, the liquid crystal 1321 molecules will remain in the current state, and no continuous power supply is required to maintain the display. This feature makes the multispectral camera 10 more energy-efficient in long-term operation or portable applications. Ultrafast ferroelectric liquid crystals generally have good high-temperature stability and can maintain stable performance over a wide temperature range. This allows the multispectral camera 10 to operate reliably under various environmental conditions without worrying about the impact of temperature on performance.

[0062] In one embodiment, among the multiple light valve components 13, each light valve component 13 is adapted to pass light signals with wavelengths within a preset range. Among them, the preset ranges of wavelengths of the multiple light valve components 13 have an intersection range, and the intersection range is: a ≤ λ ≤ b, where λ represents the wavelength, a and b are constants, and 0nm < b - a ≤ 1nm. In this way, the intersection range is very narrow, which allows for a fine analysis of the light signals. Although the preset ranges of wavelengths of each light valve component 13 have an intersection, overall they can cover a relatively wide spectral range. This design ensures that the multispectral camera 10 can capture and analyze a wider range of spectral information, rather than just a narrow band. The design of the intersection range causes the light signals between adjacent light valve components 13 to overlap, which helps to improve the continuity and stability of the signals, thereby improving the signal-to-noise ratio to a certain extent. In signal processing, this helps to reduce the influence of noise on spectral data. Due to the ability to capture and analyze finer spectral information, this design helps to improve the imaging quality.

[0063] It should be noted that the number of light valve components 13 can be set to 2, 3, 4, 5, 6, 7, 8 or more. Specifically, the present application does not limit this. Taking 8 light valve components 13 as an example, for instance, the first of the 8 light valve components 13 is adapted to pass light signals with a preset range of wavelengths of 555nm - 565nm, the second is adapted to pass light signals with a preset range of wavelengths of 556nm - 566nm, the third is adapted to pass light signals with a preset range of wavelengths of 557nm - 567nm, the fourth is adapted to pass light signals with a preset range of wavelengths of 558nm - 568nm, the fifth is adapted to pass light signals with a preset range of wavelengths of 559nm - 569nm, the sixth is adapted to pass light signals with a preset range of wavelengths of 560nm - 570nm, the seventh is adapted to pass light signals with a preset range of wavelengths of 561nm - 571nm, and the eighth is adapted to pass light signals with a preset range of wavelengths of 564nm - 574nm. In this way, the preset ranges of wavelengths of the eight filtering units have an intersection range of 564nm - 655nm. Of course, in other embodiments, the preset range of wavelengths that each light valve component 13 is adapted to pass can be selected as needed, and the present application does not limit this.

[0064] Refer to Figure 4 and Figure 7In one embodiment, the liquid crystal portion 132 includes a main body 1322, a liquid crystal unit 1323 and a conductive portion. The main body 1322 is sandwiched between the incident grating portion 131 and the exit grating portion 133. The main body 1322 forms a receiving space, and the liquid crystal unit 1323 is arranged in the receiving space. The liquid crystal unit 1323 includes a plurality of liquid crystals 1321. The conductive portion is arranged on the main body 1322. The conductive portion includes a positive electrode column 13241 and a negative electrode column 13242. The positive electrode column 13241 and the negative electrode column 13242 are electrically connected to the liquid crystal unit 1323. In this way, the incident grating portion 131 and the exit grating portion 133 can accurately control the wavelength and angle of light entering the liquid crystal unit 1323, thereby effectively filtering out unnecessary stray light and improving the clarity and contrast of imaging. The plurality of liquid crystals 1321 in the liquid crystal unit 1323 can be precisely controlled by applying voltage to the positive electrode column 13241 and the negative electrode column 13242 of the conductive portion. This control can ensure that the liquid crystal 1321 deflects at a predetermined angle, thereby achieving precise modulation of the incident light. Due to the direct connection between the conductive portion and the liquid crystal unit 1323, the voltage applied to the liquid crystal 1321 can respond quickly, achieving rapid adjustment of the deflection angle of the liquid crystal 1321. By changing the voltage applied to the liquid crystal 1321, the deflection angle of the liquid crystal 1321 can be continuously adjusted, thereby achieving flexible control of light of different wavelengths.

[0065] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article 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 and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A multispectral camera, characterized in that: include: Pedestal; A lens assembly mounted on the base, the lens assembly forming an optical axis, the lens assembly having an image side at one end of the optical axis; a light valve assembly mounted on the base and disposed on one side of the image side, the light valve assembly being on the optical axis, the light valve assembly comprising an incident grating portion, a liquid crystal portion and an exit grating portion stacked in sequence along an extension direction of the optical axis, the incident grating portion, the liquid crystal portion and the exit grating portion jointly forming a plurality of light filtering channels, the plurality of light filtering channels being arranged at intervals, and each of the light filtering channels being used to filter the optical signal; A photosensitive component is installed on the base and is located on the side of the light valve component away from the lens component. The photosensitive component is on the optical axis. The photosensitive component is formed with multiple photosensitive areas. The multiple photosensitive areas are arranged in a one-to-one correspondence with the multiple filtering channels. Each of the photosensitive areas is used to obtain the optical signal filtered by the filtering channel and is suitable for converting the optical signal into an electrical signal.

2. The multispectral camera according to claim 1, characterized in that: The liquid crystal portion has a plurality of liquid crystal regions and a plurality of non-liquid crystal regions, and the plurality of liquid crystal regions and the plurality of non-liquid crystal regions are alternately arranged; The incident grating portion and the exit grating portion each include a plurality of spaced-apart metal grating strips, along the extension direction of the optical axis, the orthographic projections of the plurality of metal grating strips of the liquid crystal portion at least partially overlap with the non-liquid crystal region, an incident channel is formed between two adjacent metal grating strips of the incident grating portion, an exit channel is formed between two adjacent metal grating strips of the exit grating portion, each of the incident channels and each of the exit channels corresponds to the liquid crystal region, so that the incident channels, the exit channels and the liquid crystal region are suitable for jointly constituting the light filtering channel.

3. The multispectral camera according to claim 1, characterized in that: It also includes a circuit board, which is installed on the base and is provided with a plurality of connection areas. The plurality of connection areas are arranged in one-to-one correspondence with the plurality of photosensitive areas, and each of the connection areas is electrically connected to the corresponding photosensitive area.

4. The multispectral camera according to claim 3, characterized in that: The circuit board is electrically connected to the light valve assembly.

5. The multispectral camera according to claim 4, characterized in that: The circuit board is arranged on a side of the photosensitive component away from the lens component; The multi-spectral camera further comprises a connecting member, one end of which is electrically connected to the light valve assembly, and the other end of which is electrically connected to the circuit board.

6. The multispectral camera according to claim 5, characterized in that: Two ends of the connecting member are respectively welded and fixed to the light valve assembly and the circuit board.

7. The multispectral camera according to claim 3, characterized in that: Along the optical axis direction, the orthographic projection of the light valve assembly and the orthographic projection of the photosensitive assembly are both within the orthographic projection of the circuit board.

8. The multispectral camera according to any one of claims 1 to 7, characterized in that: The base is formed with a receiving cavity, and the base is provided with a through hole communicating with the receiving cavity; The image side of the lens assembly is connected to the base, and the optical axis is arranged colinearly with the axis of the through hole; The light valve assembly and the photosensitive assembly are both installed in the accommodating cavity.

9. The multispectral camera according to any one of claims 1 to 7, characterized in that: The lens assembly includes a first lens barrel and a second lens barrel, wherein the adjacent ends of the first lens barrel and the second lens barrel are movably sleeved so that the ends of the first lens barrel and the second lens barrel facing away from each other are suitable for approaching or moving away from each other, wherein lenses are installed in the ends of the first lens barrel and the second lens barrel facing away from each other.

10. The multispectral camera according to any one of claims 1 to 7, characterized in that: A plurality of light valve assemblies are provided, and the plurality of light valve assemblies are stacked in sequence along the extending direction of the optical axis.

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