A multispectral polarimetric imaging system

Abstract

The utility model discloses a multispectral polarization imaging system, including preposed rotating frame and imaging detector, preposed rotating frame is provided with several imaging mirror groups along the circumference, is provided with polarization modulation subassembly and linear polaroid between imaging mirror group and imaging detector, is provided with spectral light filter array structure on the focal plane of imaging detector, polarization modulation subassembly includes at least one fixed grating and at least one translation grating who can move along the period direction of fixed grating, is provided with linear movement subassembly between polarization modulation subassembly and imaging detector, and linear movement subassembly includes a first movement part of driving polarization modulation subassembly along the light axis direction, and a second movement part of driving imaging detector along the light axis direction, the utility model discloses can quick polarization modulation and multispectral channel light filter to light, can based on the distribution position of flexible adjustment imaging element along the light axis while realizing multispectral polarization imaging, guarantees the final imaging quality.

Description

Technical Field

[0001] This invention belongs to the technical field of multispectral polarization imaging, and specifically relates to a multispectral polarization imaging system. Background Technology

[0002] With the development of camouflage and stealth technologies, detecting targets in complex environments is becoming increasingly difficult, placing higher demands on the functionality and integration of equipment. Spectral and polarization fusion imaging has thus become one of the effective measures for target detection in complex scenarios.

[0003] Because modulation in the imaging optical path for spectral and polarization imaging suffers from drawbacks such as poor timeliness and cumbersome operation, current mainstream spectral and polarization modulation measures focus on spectral and polarization filtering at the focal plane. This sacrifices a certain sampling rate but simplifies the system and improves the timeliness of spectral and polarization detection. However, for spectral and polarization fusion imaging, simultaneously performing spectral and polarization modulation at the focal plane would sacrifice a significant amount of the system sampling rate, severely impacting image quality.

[0004] For example, patent publication number "CN117968850A" proposes a single-channel multispectral polarization imaging system. It achieves polarization modulation by continuously and precisely controlling the relative angle between the fast axes of standard waveplates using two high-precision rotating motors, and selects the incident spectrum by rotating a spectral filter wheel. However, the large size and long stroke of the angle rotation device result in slow spectral and polarization modulation rates, which cannot meet the requirements for detecting the spectral and polarization information of moving targets. Furthermore, in existing multispectral polarization imaging processes, different optical systems with varying parameters are often required for applications involving different target sizes and detection distances, while flexibly achieving clear detection and imaging of multispectral polarization information.

[0005] Therefore, in view of the above-mentioned problems existing in the existing multispectral polarization imaging process, this utility model discloses a multispectral polarization imaging system. Utility Model Content

[0006] This invention discloses a multispectral polarization imaging system that can quickly perform polarization modulation and multispectral channel filtering of light. While realizing multispectral polarization imaging, it can also adjust the distribution position of imaging elements along the optical axis to focus and ensure the final imaging quality of different imaging channels.

[0007] This utility model is achieved through the following technical solution: A multispectral polarization imaging system includes a front rotating frame and an imaging detector. Several groups of imaging mirrors with different parameters are evenly distributed circumferentially on the front rotating frame. A polarization modulation component and a linear polarizer are disposed between the imaging mirror groups and the imaging detector. A spectral filter array structure is disposed on the focal plane of the imaging detector. The polarization modulation component includes at least one fixed grating and at least one translation grating capable of moving along the periodic direction of the fixed grating. A linear motion component is disposed between the polarization modulation component and the imaging detector. The linear motion component includes a first moving part that drives the polarization modulation component to move along the optical axis, and a second moving part that drives the imaging detector to move along the optical axis.

[0008] The imaging lens assembly is used to converge light for imaging. A front-mounted rotating frame drives several imaging lens assemblies to rotate circumferentially, allowing them to align with the optical axis and thus achieve focused imaging with different focusing parameters. The light then passes through a polarization modulation assembly and a linear polarizer. The fixed grating and the translation grating have the same period, and the translation grating can be shifted along the period of the fixed grating. After passing through the fixed and translation gratings, the left-hand and right-hand circular polarization components of the light acquire different phase delays, modulating the polarization direction of the final outgoing light to a specific angle of rotation. This rotation angle is related to the translation amount of the translation grating. The linear polarizer then performs polarization filtering on the light, resulting in light with a specific polarization direction. Finally, the light passes through a spectral filter array structure for spectral filtering before entering the imaging detector, ultimately achieving spectral information detection and imaging. Meanwhile, for different focal lengths, the imaging detector and polarization modulation component are moved along the optical axis by the linear movement component, so that the aperture of the light rays converged by the imaging lens group is less than or equal to the optimal imaging aperture of the polarization modulation component, so that the final converged light rays fall exactly on the focal plane of the imaging detector.

[0009] To better realize this utility model, the linear movement component further includes a first screw linear movement component, a second screw linear movement component, and an electromagnetic clutch drive device. The moving part of the first screw linear movement component is connected to the polarization modulation component, and the moving part of the second screw linear movement component is connected to the imaging detector. The first end of the electromagnetic clutch drive device is connected to the first screw linear movement component to drive the first screw linear movement component to move linearly, and the second end of the electromagnetic clutch drive device is connected to the second screw linear movement component to drive the second screw linear movement component to move linearly.

[0010] To better realize this utility model, the electromagnetic clutch drive device further includes a dual-shaft geared motor, a belt drive mechanism, and an electromagnetic clutch coupling. The dual-shaft geared motor is equipped with a belt drive mechanism on both ends of its rotating shaft. The driven end of the belt drive mechanism is connected to the screw end of the first screw linear movement assembly or the screw end of the second screw linear movement assembly through the electromagnetic clutch coupling.

[0011] To better realize this utility model, the belt drive mechanism further includes a driving pulley, a driven pulley, and a belt. The driving pulley is fixedly sleeved on the output shaft end of the dual-shaft reduction motor, and the driven pulley is sleeved on the end of the screw through an electromagnetic clutch coupling. A belt is wound between the driving pulley and the driven pulley.

[0012] To better realize this utility model, the electromagnetic clutch coupling further includes a first coupling disc, a second coupling disc, an electromagnetic part, a permanent magnet part, and a driven shaft sleeve. The first coupling disc is fixedly sleeved on the end of the screw, and the driven shaft sleeve is rotatably sleeved on the end of the screw. The driven shaft sleeve is fixedly sleeved with a driven pulley. The driven shaft sleeve slides axially and is circumferentially engaged with the second coupling disc. The electromagnetic part is provided on the side of the first coupling disc near the second coupling disc, and the permanent magnet part is provided on the side of the second coupling disc near the first coupling disc.

[0013] To better realize this utility model, the first linear moving screw assembly further includes a first linear screw, a first nut seat, and a first slide rail. The first nut seat is threaded onto the first linear screw. One side of the first nut seat is slidably connected to the first slide rail. The other side of the first nut seat is connected to the polarization modulation assembly. The end of the first linear screw is connected to the driven end of the belt drive mechanism through an electromagnetic clutch coupling.

[0014] To better realize this utility model, the second screw linear movement assembly further includes a second linear screw, a second nut seat, and a second slide rail. The second nut seat is threaded onto the second linear screw. One side of the second nut seat is slidably connected to the second slide rail, and the other side of the second nut seat is connected to the imaging detector. The end of the second linear screw is connected to the driven end of the belt drive mechanism through an electromagnetic clutch coupling.

[0015] To better realize this utility model, a translation motor is further provided on one side of the translation grating, the moving end of the translation motor is connected to one side of the translation grating and drives the translation grating to move along the periodic direction; the translation motor is connected to the demodulation controller.

[0016] To better realize this utility model, the front rotating frame further includes an indexing rotating device and a rotating frame body. The indexing rotating device is connected to the rotating shaft at the center of the rotating frame body. Several lens assembly mounting slots are evenly arranged circumferentially around the rotating shaft on the rotating frame body. An imaging lens assembly is detachably mounted inside the lens assembly mounting slot.

[0017] To better realize this utility model, the indexing rotation device further includes a rotating motor, a drive disk, and an indexing rotation frame. The rotating shaft at the center of the drive disk is connected to the output shaft of the rotating motor. A drive boss is provided at the edge of the drive disk. The rotating shaft at the center of the indexing rotation frame is coaxially connected to the rotation frame body. Several indexing grooves that slide and cooperate with the drive boss are evenly distributed along the circumference of the indexing rotation frame.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model adopts a polarization modulation component based on a subwavelength structure. By driving the translation grating to move relative to the fixed grating along the periodic direction within an extremely short stroke, it achieves rapid polarization modulation of light, which is highly efficient and highly integrated. At the same time, a spectral filter array structure is integrated in the focal plane of the imaging detector to perform multispectral channel filtering in the image plane. This enables the acquisition of target polarization information and spectral information in the same imaging optical system, and finally realizes multispectral polarization fusion imaging. (2) This utility model achieves imaging under different optical parameter conditions by circumferentially installing imaging lens groups with different optical parameters on the front rotating frame and rotating the front rotating frame to rotate the different imaging lens groups to the optical axis. (3) By setting a linear moving component to drive the polarization modulation component and the imaging detector to move along the optical axis, this utility model can ensure that the aperture of the light is matched with the optimal light transmission aperture of the polarization modulation component when imaging lens groups with different optical parameters are used, and ensure that the final focused imaging position of the light falls on the focal plane of the imaging detector, thereby ensuring the final imaging quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multispectral polarization imaging system; Figure 2 This is a schematic diagram of the linear motion component. Figure 3 for Figure 2 A magnified view of part A; Figure 4 This is a schematic diagram of the imaging lens assembly mounted on the front rotating frame. Figure 5 This is a schematic diagram of the indexing rotary device. Figure 6 This is a schematic diagram of the mirror assembly being installed on the rotating frame body.

[0020] Wherein: 1-front rotating frame; 2-imaging detector; 3-imaging lens group; 4-linear polarizer; 5-polarization modulation component; 6-spectral filter array structure; 7-linear movement component; 11-Indexing rotation device; 12-Rotating frame body; 111-Rotating motor; 112-Drive disk; 113-Indexing rotating frame; 114-Drive boss; 115-Indexing slot; 51-Fixed grating; 52-Translation grating; 531-Translation motor; 532-Demodulation controller; 71-First screw linear movement assembly; 72-Second screw linear movement assembly; 73-Electromagnetic clutch drive device; 711-First linear screw; 712-First linear screw; 713-First slide rail; 721-Second linear screw; 722-Second nut seat; 723-Second slide rail; 731-Dual-shaft geared motor; 732-Belt drive mechanism; 733-Electromagnetic clutch coupling; 7321-Driving pulley; 7322-Driven pulley; 7323-Belt; 7331-First coupling disc; 7332-Second coupling disc; 7333-Electromagnetic part; 7334-Permanent magnet part; 7335-Driven bushing. Detailed Implementation

[0021] Example 1: This embodiment provides a multispectral polarization imaging system, such as Figure 1 and Figure 2 As shown, the device includes a front rotating frame 1 and an imaging detector 2. Several sets of imaging mirror groups 3 with different parameters are evenly distributed along the circumference of the front rotating frame 1. A polarization modulation component 5 and a linear polarizer 4 are disposed between the imaging mirror group 3 and the imaging detector 2. A spectral filter array structure 6 is disposed on the focal plane of the imaging detector 2. The polarization modulation component 5 includes at least one fixed grating 51 and at least one translation grating 52 that can move along the periodic direction of the fixed grating 51. A linear moving component 7 is disposed between the polarization modulation component 5 and the imaging detector 2. The linear moving component 7 includes a first moving part that drives the polarization modulation component 5 to move along the optical axis and a second moving part that drives the imaging detector 2 to move along the optical axis.

[0022] When the imaging lens group 3, polarization modulation component 5, linear polarizer 4, and imaging detector 2 are arranged on the same optical axis, they constitute an imaging structure. By rotating the front rotating frame 1, the imaging lens group 3 with different focusing parameters is moved to the optical axis, thereby achieving focused imaging of the light rays with different focusing parameters. Simultaneously, depending on the degree of light convergence, the focal length at which the light ultimately forms an image at the imaging detector 2, and the aperture of the polarization modulation component 5, will change. At this point, the linear moving component 7 moves the polarization modulation component 5 along the optical axis, ensuring that the aperture of the light rays converged by the imaging lens group 3 is less than or equal to the optimal imaging aperture of the polarization modulation component 5, so that the light rays ultimately converge onto the focal plane of the imaging detector 2.

[0023] Based on this, both the fixed grating 51 and the translation grating 52 have a grating period of k. The translation grating 52 is moved a distance Δx along the period direction. After the light passes through the fixed grating 51 and the translation grating 52, the left-hand circular polarization component and the right-hand circular polarization component of the light receive different phase delays, causing the polarization direction of the emitted light to be modulated by a specific rotation angle α. The calculation formula is as follows: α = 2πΔx / k; Then, the light is polarized and filtered by the linear polarizer 4. Assuming that the polarization direction of the linear polarizer 4 is β, the polarization direction of the light reaching the imaging detector 2 is β, and the polarization direction of the light reflected from the target is β-α.

[0024] Therefore, when the translation grating 52 moves at different distances along the periodic direction, the system ultimately obtains information on the different polarization directions reflected by the target, thereby achieving polarization imaging of the target. Preferably, to obtain Stokes polarization degree and polarization angle information, at least three different polarization direction information are required, corresponding to at least three non-coincident translation positions of the translation grating 52. The relative displacement between the translation positions is usually within one period and can be on the order of μm. Therefore, the polarization modulation speed of this system is very fast and can meet the requirements of rapid polarization imaging information detection.

[0025] Then, the light passes through the spectral filter array structure 6 for spectral filtering, and spectral information is obtained in real time. The spectral filter array structure 6 is encapsulated in the focal plane of the imaging detector 2 to ensure that the pixel array of the imaging detector 2 is aligned with the spectral filter channel. The spectral filter array structure 6 is usually a periodic filter arrangement. Each period is usually a macro-pixel local area of ​​2×2, 3×3, 4×4, 2×3, etc. Within each period, different pixel areas correspond to different bandpass filter bands. Through coating design, it has different narrowband filtering characteristics, so that a macro-pixel contains multiple filter bands. The light passes through the spectral filter array structure 6 and undergoes intensity decomposition containing spectral information. Finally, it is incident on the focal plane of the imaging detector 2 to realize spectral information detection and imaging.

[0026] Example 2: This embodiment discloses a multispectral polarization imaging system, which is optimized based on Embodiment 1, such as... Figure 2 As shown, the linear motion assembly 7 includes a first screw linear motion assembly 71, a second screw linear motion assembly 72, and an electromagnetic clutch drive device 73. The moving part of the first screw linear motion assembly 71 is connected to the polarization modulation assembly 5, and the moving part of the second screw linear motion assembly 72 is connected to the imaging detector 2. The first end of the electromagnetic clutch drive device 73 is connected to the first screw linear motion assembly 71 to drive the first screw linear motion assembly 71 to move linearly, and the second end of the electromagnetic clutch drive device 73 is connected to the second screw linear motion assembly 72 to drive the second screw linear motion assembly 72 to move linearly.

[0027] The electromagnetic clutch drive device 73 includes two electromagnetic clutch output terminals. The first electromagnetic clutch output terminal is correspondingly disposed with the end of the screw in the first screw linear movement assembly 71, and the second electromagnetic clutch output terminal is correspondingly disposed with the end of the screw in the second screw linear movement assembly 72. When the first electromagnetic clutch output terminal is energized, it generates an electromagnetic force that frictionally connects with the end of the screw in the first screw linear movement assembly 71, thereby driving the screw in the first screw linear movement assembly 71 to rotate, thus enabling the polarization modulation assembly 5 to move linearly along the optical axis via the first screw linear movement assembly 71. When the second electromagnetic clutch output terminal is energized, it generates an electromagnetic force that frictionally connects with the end of the screw in the second screw linear movement assembly 72, thereby driving the screw in the second screw linear movement assembly 72 to rotate, thus enabling the imaging detector 2 to move linearly along the optical axis via the second screw linear movement assembly 72.

[0028] When the first electromagnetic clutch output is de-energized, the electromagnetic force disappears, and the first electromagnetic clutch output disengages from the screw end in the first screw linear movement assembly 71, no longer driving the screw to rotate. Similarly, when the second electromagnetic clutch output is de-energized, the electromagnetic force disappears, and the second electromagnetic clutch output disengages from the screw end in the second screw linear movement assembly 72, no longer driving the screw to rotate.

[0029] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0030] Example 3: This embodiment discloses a multispectral polarization imaging system, which is optimized based on Embodiment 1 or 2, such as... Figure 2As shown, the electromagnetic clutch drive device 73 includes a dual-shaft reduction motor 731, a belt drive mechanism 732, and an electromagnetic clutch coupling 733. The dual-shaft reduction motor 731 has a belt drive mechanism 732 on each of its two ends. The driven end of the belt drive mechanism 732 is connected to the screw end of the first screw linear movement assembly 71 or the screw end of the second screw linear movement assembly 72 through the electromagnetic clutch coupling 733.

[0031] When the electromagnetic clutch coupling 733 is energized, the driven end of the belt drive mechanism 732 is connected to the screw end of the first screw linear movement assembly 71 or the screw end of the second screw linear movement assembly 72, thus enabling the polarization modulation assembly 5 and the imaging detector 2 to move along the optical axis. When the electromagnetic clutch coupling 733 is de-energized, the driven end of the belt drive mechanism 732 disengages from the screw end of the first screw linear movement assembly 71 or the screw end of the second screw linear movement assembly 72.

[0032] Furthermore, such as Figure 3 As shown, the belt drive mechanism 732 includes a driving pulley 7321, a driven pulley 7322, and a belt 7323. The driving pulley 7321 is fixedly sleeved on the output shaft end of the dual-shaft reduction motor 731. The driven pulley 7322 is sleeved on the end of the screw through an electromagnetic clutch coupling 733. The belt 732 is wound between the driving pulley 7321 and the driven pulley 7322. The electromagnetic clutch coupling 733 includes a first coupling disc 7331, a second coupling disc 7332, an electromagnetic part 7333, a permanent magnet part 7334, and a driven bushing 7335. The first coupling disc 7331 is fixedly sleeved on the end of the screw, and the driven bushing 7335 is rotatably sleeved on the end of the screw. The driven bushing 7335 is fixedly sleeved with a driven pulley 7322. The driven bushing 7335 slides axially and is circumferentially engaged with the second coupling disc 7332. The electromagnetic part 7333 is provided on the side of the first coupling disc 7331 near the second coupling disc 7332, and the permanent magnet part 7334 is provided on the side of the second coupling disc 7332 near the first coupling disc 7331.

[0033] The magnetism generated by the electromagnetic part 7333 after being energized is different from that of the permanent magnet part 7334. When the electromagnetic part 7333 is energized, it generates an attractive force on the permanent magnet part 7334, thereby driving the second coupling disk 7332 to move closer to the first coupling disk 7331. A friction groove is provided on the side of the first coupling disk 7331 near the second coupling disk 7332, and a friction protrusion is provided on the side of the second coupling disk 7332 near the first coupling disk 7331. When the friction groove and the friction protrusion are in close contact, friction is generated, which in turn drives the first coupling disk 7331 and the screw to rotate.

[0034] As shown in the figure, the driven bushing 7335 is rotatably fitted onto the end of the screw. The driven pulley 7322 is keyed to the outside of the driven bushing 7335. Because the driven bushing 7335 is rotatably connected to the end of the screw, the screw cannot be driven to rotate by the driven pulley 7322 when the friction groove and friction protrusion are not in contact. The driven bushing 7335 has an axial guide groove on its outside, and the inner wall of the second coupling disc 7332 has an axial through groove. A key is provided between the axial through groove and the axial guide groove, allowing the second coupling disc 7332 to move axially outside the driven bushing 7335 but not to rotate circumferentially relative to it.

[0035] When the electromagnetic unit 7333 is energized, the permanent magnet 7334 on the second coupling disk 7332 is attracted by magnetic force, which in turn drives the second coupling disk 7332 to move towards the first coupling disk 7331. At this time, the spring piece located between the end face of the driven bushing 7335 and the second coupling disk 7332 is compressed, causing the friction groove and friction protrusion to fit tightly together to generate friction. Under the action of friction, the first coupling disk 7331 drives the second coupling disk 7332 to rotate, which in turn drives the screw to rotate. When the electromagnetic unit 7333 is de-energized, the spring piece returns to its original state and drives the second coupling disk 7332 to move towards the first coupling disk 7331. At this time, the friction groove and friction protrusion separate, and the screw stops rotating.

[0036] The rest of this embodiment is the same as that in embodiment 1 or 2, so it will not be repeated here.

[0037] Example 4: This embodiment discloses a multispectral polarization imaging system, which is optimized based on any one of embodiments 1-3, such as... Figure 2 As shown, the first linear screw movement assembly 71 includes a first linear screw 711, a first nut seat 712, and a first slide rail 713. The first nut seat 712 is threaded onto the first linear screw 711. One side of the first nut seat 712 is slidably connected to the first slide rail 713, and the other side of the first nut seat 712 is connected to the polarization modulation assembly 5. The end of the first linear screw 711 is connected to the driven end of the belt drive mechanism 732 through an electromagnetic clutch coupling 733.

[0038] The second linear screw movement assembly 72 includes a second linear screw 721, a second nut seat 722, and a second slide rail 723. The second nut seat 722 is threaded onto the second linear screw 721. One side of the second nut seat 722 is slidably connected to the second slide rail 723, and the other side of the second nut seat 722 is connected to the imaging detector 2. The end of the second linear screw 721 is connected to the driven end of the belt drive mechanism 732 through an electromagnetic clutch coupling 733.

[0039] In fact, the first screw linear movement assembly 71 and the second screw linear movement assembly 72 have the same structure. The only difference is that the object installed on the moving end is different. Therefore, the first screw linear movement assembly 71 will be used for explanation.

[0040] The base of the polarization modulation component 5 is connected to the first slide rail 713 in a direction parallel to the optical axis via a slider. When the first linear screw 711 rotates, it drives the base of the polarization modulation component 5 to move along the optical axis direction of the first slide rail 713 via the first nut seat 712.

[0041] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.

[0042] Example 5: This embodiment discloses a multispectral polarization imaging system, which is optimized based on any one of embodiments 1-4, such as... Figure 1 As shown, a translation motor 531 is provided on one side of the translation grating 52. The moving end of the translation motor 531 is connected to one side of the translation grating 52 and drives the translation grating 52 to move along the periodic direction. The translation motor 531 is connected to the demodulation controller 532.

[0043] The translation grating 52 is moved along the periodic direction by the translation motor 531. The periodic direction refers to the direction perpendicular to the grating direction on the fixed grating 51. The demodulation controller 532 outputs a control signal to the translation motor 531, so that the translation motor 531 can be remotely operated to move the translation grating 52, thereby realizing the polarization modulation of light.

[0044] Furthermore, the high-precision translation motor 531 includes a high-precision voice coil motor module, which is a combination of a voice coil motor, a linear grating, and a driver. Its model is G-PGTWI6 / 100SEKHDD2 or WDLS2005. The total stroke of the high-precision translation motor 531 is 5mm, the rated thrust is 5N, the positioning repeatability is 3μm, and the resolution is 1μm.

[0045] The rest of the content of this embodiment is the same as any one of embodiments 1-4, so it will not be repeated here.

[0046] Example 6: This embodiment discloses a multispectral polarization imaging system, which is optimized based on any one of embodiments 1-5, such as... Figures 4-6 As shown, the front rotating frame 1 includes an indexing rotating device 11 and a rotating frame body 12. The indexing rotating device 11 is connected to the rotating shaft at the center of the rotating frame body 12. Several lens assembly mounting slots are evenly arranged circumferentially around the rotating shaft on the rotating frame body 12. An imaging lens assembly 3 can be detachably installed inside the lens assembly mounting slot.

[0047] Imaging lens groups 3 with different focusing parameters are fitted into the lens group mounting slots and secured with pressure caps and screws to ensure that the imaging lens groups 3 are stably fixed on the rotating frame body 12. The indexing rotation device 11 drives the rotating frame body 12 to rotate at a fixed indexing angle each time, thereby enabling rotation and switching between different lens group mounting slots. This allows different imaging lens groups 3 to rotate to the optical axis coaxial with the polarization modulation component 5, achieving flexible combinations of different focusing degrees.

[0048] Furthermore, the indexing rotation device 11 includes a rotation motor 111, a drive disk 112, and an indexing rotation frame 113. The central shaft of the drive disk 112 is connected to the output shaft of the rotation motor 111. A drive boss 114 is provided at the edge of the drive disk 112. The central shaft of the indexing rotation frame 113 is coaxially connected to the rotation frame body 12. A plurality of indexing grooves 115 that slide and engage with the drive bosses 114 are evenly distributed along the circumference of the indexing rotation frame 113.

[0049] When the drive boss 114 rotates into the indexing slot 115, it slides and presses against the indexing slot 115, causing the indexing rotating frame 113 to rotate by a specific angle, which in turn causes the rotating frame body 12 to rotate by a specific angle. For example, if the rotating frame body 12 has four sets of lens mounting slots evenly distributed circumferentially, then each rotation of 90° is required to switch to the next lens mounting slot. Therefore, the indexing rotating frame 113 has four indexing slots 115 evenly distributed circumferentially, so that the indexing rotating frame 113 drives the rotating frame body 12 to rotate 90° each time. When the drive boss 114 disengages from the indexing slot 115, the indexing slot 115 is no longer under pressure, and the indexing rotating frame 113 stops rotating.

[0050] The rest of the content of this embodiment is the same as any one of embodiments 1-5, so it will not be repeated here.

[0051] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A multispectral polarization imaging system, comprising a front rotating frame (1) and an imaging detector (2), characterized in that, The front rotating frame (1) is provided with several sets of imaging mirror groups (3) with different parameters evenly distributed along the circumference. A polarization modulation component (5) and a linear polarizer (4) are provided between the imaging mirror group (3) and the imaging detector (2). A spectral filter array structure (6) is provided on the focal plane of the imaging detector (2). The polarization modulation component (5) includes at least one fixed grating (51) and at least one translation grating (52) that can move along the periodic direction of the fixed grating (51). A linear moving component (7) is provided between the polarization modulation component (5) and the imaging detector (2). The linear moving component (7) includes a first moving part that drives the polarization modulation component (5) to move along the optical axis and a second moving part that drives the imaging detector (2) to move along the optical axis.

2. The multispectral polarization imaging system according to claim 1, characterized in that, The linear motion assembly (7) includes a first screw linear motion assembly (71), a second screw linear motion assembly (72), and an electromagnetic clutch drive device (73). The moving part of the first screw linear motion assembly (71) is connected to the polarization modulation assembly (5), and the moving part of the second screw linear motion assembly (72) is connected to the imaging detector (2). The first end of the electromagnetic clutch drive device (73) is connected to the first screw linear motion assembly (71) to drive the first screw linear motion assembly (71) to move linearly, and the second end of the electromagnetic clutch drive device (73) is connected to the second screw linear motion assembly (72) to drive the second screw linear motion assembly (72) to move linearly.

3. The multispectral polarization imaging system according to claim 2, characterized in that, The electromagnetic clutch drive device (73) includes a dual-shaft geared motor (731), a belt drive mechanism (732), and an electromagnetic clutch coupling (733). The dual-shaft geared motor (731) has a belt drive mechanism (732) on both ends of its rotating shaft. The driven end of the belt drive mechanism (732) is connected to the screw end of the first screw linear movement assembly (71) or the screw end of the second screw linear movement assembly (72) through the electromagnetic clutch coupling (733).

4. A multispectral polarization imaging system according to claim 3, characterized in that, The belt drive mechanism (732) includes a driving pulley (7321), a driven pulley (7322), and a belt (7323). The driving pulley (7321) is fixedly sleeved on the output shaft end of the dual-shaft reduction motor (731). The driven pulley (7322) is sleeved on the end of the screw through an electromagnetic clutch coupling (733). The belt (7323) is wound between the driving pulley (7321) and the driven pulley (7322).

5. A multispectral polarization imaging system according to claim 4, characterized in that, The electromagnetic clutch coupling (733) includes a first coupling disc (7331), a second coupling disc (7332), an electromagnetic part (7333), a permanent magnet part (7334), and a driven bushing (7335). The first coupling disc (7331) is fixedly sleeved on the end of the screw, and the driven bushing (7335) is rotatably sleeved on the end of the screw. The driven bushing (7335) is fixedly sleeved with a driven pulley (7322). The driven bushing (7335) slides axially and is circumferentially engaged with the second coupling disc (7332). The electromagnetic part (7333) is provided on the side of the first coupling disc (7331) near the second coupling disc (7332), and the permanent magnet part (7334) is provided on the side of the second coupling disc (7332) near the first coupling disc (7331).

6. A multispectral polarization imaging system according to claim 3, characterized in that, The first linear moving screw assembly (71) includes a first linear screw (711), a first nut seat (712), and a first slide rail (713). The first nut seat (712) is threaded onto the first linear screw (711). One side of the first nut seat (712) is slidably connected to the first slide rail (713), and the other side of the first nut seat (712) is connected to the polarization modulation assembly (5). The end of the first linear screw (711) is connected to the driven end of the belt drive mechanism (732) through an electromagnetic clutch coupling (733).

7. A multispectral polarization imaging system according to claim 3, characterized in that, The second linear moving screw assembly (72) includes a second linear screw (721), a second nut seat (722), and a second slide rail (723). The second nut seat (722) is threaded onto the second linear screw (721). One side of the second nut seat (722) is slidably connected to the second slide rail (723), and the other side of the second nut seat (722) is connected to the imaging detector (2). The end of the second linear screw (721) is connected to the driven end of the belt drive mechanism (732) through an electromagnetic clutch coupling (733).

8. A multispectral polarization imaging system according to any one of claims 1-7, characterized in that, A translation motor (531) is provided on one side of the translation grating (52). The moving end of the translation motor (531) is connected to one side of the translation grating (52) and drives the translation grating (52) to move along the periodic direction. The translation motor (531) is connected to the demodulation controller (532).

9. A multispectral polarization imaging system according to any one of claims 1-7, characterized in that, The front rotating frame (1) includes an indexing rotating device (11) and a rotating frame body (12). The indexing rotating device (11) is connected to the rotating shaft at the center of the rotating frame body (12). Several lens assembly mounting slots are evenly arranged around the rotating shaft on the rotating frame body (12). An imaging lens assembly (3) can be detachably installed inside the lens assembly mounting slot.

10. A multispectral polarization imaging system according to claim 9, characterized in that, The indexing rotation device (11) includes a rotating motor (111), a drive disk (112), and an indexing rotation frame (113). The rotating shaft at the center of the drive disk (112) is connected to the output shaft of the rotating motor (111). A drive boss (114) is provided at the edge of the drive disk (112). The rotating shaft at the center of the indexing rotation frame (113) is coaxially connected to the rotation frame body (12). Several indexing grooves (115) that slide and cooperate with the drive boss (114) are evenly distributed along the circumference of the indexing rotation frame (113).

Images