Multispectral synchronous imaging device and imaging method

Abstract

The invention discloses a multispectral synchronous imaging device and method, and the device comprises a collimation light path which is used for receiving a target light ray and collimating the target light ray into a collimated light beam; the step-by-step light splitting part is used for splitting the collimated light beams output by the collimated light path into a plurality of single-waveband light beams with different target wavebands step by step by adopting a selective transmission and reflection light splitting mode; the reforming light path is used for performing light intensity adjustment, direction adjustment and refocusing on the plurality of single-band light beams output by the step-by-step light splitting part; and the imaging unit is used for receiving the plurality of single-band light beams converged by the reforming light path and completing synchronous acquisition of a plurality of single-band light beam images. The high-reflection narrow-band optical filter is adopted, the step-by-step wave band separation process is carried out in a selective transmission and reflection light splitting mode, the high light intensity utilization rate and the high spectrum separation precision are achieved, and the problems of light intensity loss, uneven wave band distribution and the like caused by aperture segmentation in the prior art are effectively solved.

Description

Technical Field

[0001] The present application belongs to the field of optical imaging and multi-spectral diagnosis technology, and specifically relates to a multi-spectral synchronous imaging device and imaging method. The device is suitable for multi-disciplinary research fields such as medical spectral analysis, plasma diagnosis and combustion research, and especially shows significant advantages in transient target multi-spectral imaging scenarios. Background Art

[0002] Multispectral imaging technology can reveal the component distribution and dynamic changes in complex physical processes by acquiring imaging data of the target object in multiple spectral bands. It is widely used in physics, chemistry, biology and industry.

[0003] However, existing multispectral imaging technologies have technical bottlenecks such as low spectral separation efficiency and difficulty in balancing temporal and spatial resolutions. For example, traditional spectrometers based on the principle of diffraction can only analyze the spectrum of a single point, do not have spatial resolution, and are difficult to capture the dynamic evolution of transient processes; scanning imaging spectrometers have low temporal resolution due to the scanning process, and are difficult to meet the imaging requirements of dynamic targets; diffraction imaging spectrometers cannot balance spatial and spectral resolutions; multispectral imaging methods based on filter switching require mechanical switching of filters and cannot capture rapidly changing dynamic targets; the spectral efficiency in multispectral imaging methods based on aperture segmentation (aperture division) is affected by the number of imaging bands. In addition, this spectral division method inevitably leads to significant attenuation of light intensity, thereby reducing the utilization rate of light intensity, which may lead to poor imaging quality in certain bands. Summary of the invention

[0004] In order to solve the problems existing in the existing multispectral imaging technology, the present application provides a multispectral synchronous imaging device and imaging method, which can realize multi-band, efficient and synchronous acquisition of target images, and has technical advantages such as high light intensity utilization, high temporal resolution and high spatial resolution.

[0005] On the one hand, the present application is implemented through the following technical solutions:

[0006] A multi-spectral synchronous imaging device, comprising:

[0007] A collimated light path, the collimated light path is used to receive the target light and collimate it into a nearly collimated light beam;

[0008] A step-by-step light splitting part, which uses a selective transmission and reflection light splitting method to split the approximately collimated light beam output by the collimated light path step by step into a plurality of single-band light beams with different target bands;

[0009] Rearranging the optical path, the reorganizing optical path is used to adjust the light intensity, direction and refocus the multiple single-band light beams output by the step-by-step light splitting part;

[0010] And, an imaging unit, wherein the imaging unit is used to receive the multiple single-band light beams converged through the rearranged light path, and complete the synchronous acquisition of the multiple single-band light beam images.

[0011] In some embodiments, the collimated light path includes at least one telephoto collimating convex lens, and the focal length of the telephoto collimating convex lens is greater than or equal to the maximum optical path of the collimated light beam;

[0012] The maximum optical path is calculated from the outgoing light collimated by the telephoto collimating convex lens as the starting point, through the step-by-step light splitting part, and with the focus of the rearranged optical path as the end point.

[0013] In some embodiments, the step-by-step light splitting part includes at least two highly reflective narrow-band filters, and the ranges of the transmission band and the reflection band are selected according to actual application requirements;

[0014] The high-reflective narrow-band filter achieves high transmittance in a target band and high reflectivity in a non-target band.

[0015] In some embodiments, the high-reflective narrow-band filters in the step-by-step splitting part are arranged in sequence according to preset angles, so that the light beam reflected by the previous high-reflective narrow-band filter can accurately enter the next high-reflective narrow-band filter, forming a continuous band separation process.

[0016] In some embodiments, the angle between the normal direction of the exit surface of the high-reflective narrow-band filter and the direction of the main optical axis light is an acute angle.

[0017] In some embodiments, the highly reflective narrow-band filter of the step-by-step light splitting part can adjust the angle according to the light source characteristics and experimental requirements, so that the transmission path and reflection path of the light are optimized.

[0018] In some embodiments, the rearranged optical path includes at least one focusing convex lens for adjusting the spot size and focusing position of the single-band light beam.

[0019] In some embodiments, a light intensity attenuation plate is further provided in the reformed optical path for attenuating a single-band light beam whose light intensity is greater than a threshold value.

[0020] In some embodiments, the photosensitivity range of the imaging unit covers the transmission bands of all high-reflection narrow-band filters in the step-by-step light splitting part.

[0021] On the other hand, the present application also proposes an imaging method based on the above-mentioned multi-spectral synchronous imaging device, comprising:

[0022] After the target light is processed by the collimated optical path, a nearly collimated light beam is formed, the angle between the target light and the main optical axis is less than the threshold value;

[0023] The approximately collimated light beam enters the step-by-step light splitting part, and is selectively transmitted and reflected in sequence, so as to separate multiple single-band light beams step by step;

[0024] A plurality of single-band light beams enter the reorganized light path, undergo light intensity modulation, direction adjustment and refocusing, and finally converge at different imaging areas of the imaging unit;

[0025] Images carrying information of different wavelength bands are synchronously collected by the imaging unit.

[0026] A multi-spectral synchronous imaging device and imaging method proposed in the present application adopt a highly reflective narrow-band filter to perform a step-by-step band separation process through a selective transmission and reflection splitting method, thereby achieving high light intensity utilization and high spectral separation accuracy, and effectively avoiding the problems of light intensity loss and uneven band distribution caused by aperture division in traditional technologies.

[0027] A multi-spectral synchronous imaging device and imaging method proposed in the present application can ensure the temporal consistency of images of each band by synchronously collecting images of different bands through a single imaging unit. Combined with high-speed imaging technology, high temporal resolution can be achieved while ensuring high spatial resolution. In addition, imaging images of all bands are observed through a single optical path, avoiding spatial differences and calibration errors caused by multi-optical path imaging.

[0028] A multi-spectral synchronous imaging device and imaging method proposed in the present application solve the overexposure problem caused by the difference in light intensity in different bands by reorganizing the light intensity attenuation plate in the optical path, and adapt to the multi-band imaging needs under complex experimental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0030] Figure 1 Schematic diagram of the multi-spectral synchronous imaging device proposed in an embodiment of the present application.

[0031] Reference numerals and corresponding component names:

[0032] 1-target object, 11-first light-emitting area, 12-second light-emitting area, 13-third light-emitting area, 14-fourth light-emitting area, 2-collimated light path, 21-plano-concave lens, 22-first reflector, 23-telephoto plano-convex lens, 3-step-by-step light splitting part, 31-second reflector, 32-third reflector, 33-fourth reflector, 301-first high-reflection narrow-band filter, 302-second high-reflection narrow-band filter, 303- The third high reflective narrow-band filter, 304-the fourth high reflective narrow-band filter, 4-rearranged optical path, 421-the fifth reflector, 422-the sixth reflector, 423-the seventh reflector, 424-the eighth reflector, 411-the first light intensity attenuation plate, 412-the second light intensity attenuation plate, 43-the plano-convex lens, 5-the imaging unit, 61-the first imaging image, 62-the second imaging image, 63-the third imaging image, 64-the fourth imaging image. DETAILED DESCRIPTION

[0033] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items.

[0034] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0035] The expressions (such as "first", "second", etc.) used in the various embodiments of the present application may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present application, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0036] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0037] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0038] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with examples and drawings. The illustrative implementation scheme of the present application and its description are only used to explain the present application and are not intended to limit the present application.

[0039] Example:

[0040] In view of the technical problems of low spectral separation efficiency and low light intensity utilization in existing multi-spectral imaging technologies, this embodiment proposes a multi-spectral synchronous imaging device, which adopts a highly reflective narrow-band filter to achieve high light intensity utilization and high spectral separation accuracy through step-by-step splitting, effectively avoiding the light intensity loss and uneven band distribution problems caused by aperture division in traditional technologies.

[0041] like Figure 1 As shown, the device proposed in this embodiment includes: a collimating light path 2, a step-by-step light splitting part 3, a rearrangement light path 4 and an imaging unit 5 which are sequentially arranged along the light path direction.

[0042] The collimated optical path 2 is used to collimate the incident light at each point of the target object 1 into an approximately collimated light beam with a divergence angle less than its threshold and a diameter change less than its threshold, so as to adapt to the subsequent spectrum step-by-step separation and reorganization process.

[0043] Furthermore, the collimated light path includes at least one telephoto collimating convex lens, whose focal length is greater than or equal to the maximum optical path of the collimated light beam; wherein the maximum optical path is calculated starting from the outgoing light after collimation by the telephoto collimating convex lens, passing through the step-by-step splitting part, and ending at the focus of the rearranged light path.

[0044] Specifically, Figure 1 As shown, the collimating optical path 2 mainly includes a plano-concave lens 21, a first reflector 22, and a telephoto plano-convex lens 23 arranged in sequence along the optical path direction. The plano-concave lens 21 is used to change the viewing angle of the entire lens group of the collimating optical path 2; the first reflector 22 is used to fold the incident optical path of the telephoto plano-convex lens 23, and the number and placement of the first reflectors 22 can be freely combined according to the needs of different usage scenarios, so that the overall length of the collimating optical path 2 is minimized while ensuring that the target object 1 is at the focus of the telephoto plano-convex lens 23.

[0045] The step-by-step beam splitting part 3 is used to split an imaging beam into a plurality of imaging beams of different target wavelength bands step-by-step.

[0046] Furthermore, the step-by-step light splitting part 3 includes at least two highly reflective narrow-band filters, which realize multi-band separation of the collimated light beam through selective transmission and reflection, retaining high light intensity utilization while avoiding light intensity loss in other bands during spectral separation.

[0047] Furthermore, when the collimated light beam enters the high-reflection narrowband filter at an incident angle of θ, the transmission band light passes through the filter, while the cutoff band light is reflected to the next filter, and multi-band separation is achieved step by step. The above transmission and reflection process is repeated to form multiple single-band light beams of different bands.

[0048] Furthermore, in the step-by-step light splitting part 3, the cut-off depth of the high-reflective narrow-band filter is greater than or equal to 4, and the incident angle θ is controlled to be no greater than 45°, thereby ensuring high efficiency of transmittance and reflectance.

[0049] Furthermore, in the step-by-step light splitting part 3, the angle of the high-reflective narrow-band filter can be adjusted according to the light source characteristics and experimental requirements, so that the transmission path and reflection path of the light are optimized.

[0050] Specifically, Figure 1As shown, the step-by-step light splitting part 3 mainly includes a first high-reflection type narrow-band filter 301, a second high-reflection type narrow-band filter 302, a third high-reflection type narrow-band filter 303, a fourth high-reflection type narrow-band filter 304, a second reflector 31, a third reflector 32 and a fourth reflector 33. Among them, the working bands of the four high-reflection type narrow-band filters are all 200nm to 1200nm, and the central wavelengths of the first high-reflection type narrow-band filter 301, the second high-reflection type narrow-band filter 302, the third high-reflection type narrow-band filter 303 and the fourth high-reflection type narrow-band filter 304 are 600nm, 550nm, 450nm, 500nm respectively, and the bandwidths are all ±1.5nm. The first high-reflection narrow-band filter 301 transmits the light of 600±1.5nm in the collimated light beam, and reflects the light of 200-598.5nm and 601.5-1200nm. The second reflector 31 redirects the light reflected by the first high-reflection narrow-band filter 301 to enter the second high-reflection narrow-band filter 302 at the same incident angle. The second high-reflection narrow-band filter 302 transmits the light of 550±1.5nm in the collimated light beam, and reflects the light of 200-548.5nm, 551.5nm-598.5nm and 601.5-1200nm. The third reflector 32 redirects the light reflected by the second high-reflection narrow-band filter 302 to enter the third high-reflection narrow-band filter 303 at the same incident angle. By analogy, after transmission and reflection through four filters, four imaging beams with wavelengths of 600±1.5nm, 550±1.5nm, 450±1.5nm, and 500±1.5nm are finally obtained, as well as an imaging beam with wavelengths of 200-448.5nm, 451.5-498.5nm, 501.5-548.5nm, 551.5-598.5nm, and 601.5-1200nm. In addition, the imaging beam after the last filter can be processed and used again according to actual needs.

[0051] It should be noted that Figure 1 What is shown is only an exemplary description, and does not limit the number of high-reflective narrow-band filters and reflectors in the step-by-step splitting part 3. The number of reflectors and the number of high-reflective narrow-band filters in the step-by-step splitting part 3 can be increased or decreased according to demand.

[0052] The optical path reorganization 4 refocuses multiple single-band light beams onto the same imaging plane by changing the propagation direction and spot position of each target band light beam.

[0053] Furthermore, the reforming optical path 4 includes at least one focusing convex lens for adjusting the spot size and focusing position of the single-band light beam. A light intensity attenuation plate can also be added to the reforming optical path 4 to attenuate the over-bright band, avoid overexposure, and improve imaging uniformity and data accuracy.

[0054] Specifically, Figure 1 As shown, the rearranged optical path 4 mainly includes a fifth reflector 421, a sixth reflector 422, a seventh reflector 423, an eighth reflector 424, a first light intensity attenuation plate 411, a second light intensity attenuation plate 412 and a plano-convex lens 43. Among them, the fifth reflector 421, the sixth reflector 422, the seventh reflector 423 and the eighth reflector 424 respectively change the direction and compact the four imaging light beams with wavelengths of 500±1.5nm, 450±1.5nm, 550±1.5nm and 600±1.5nm. The two light intensity attenuation plates are used to reduce the brightness of the imaging light beams with relatively strong light intensity (imaging light beams with two wavelengths of 600±1.5nm and 500±1.5nm in this embodiment). The plano-convex lens 43 is used to focus the four compact imaging light beams on the same imaging unit 5.

[0055] The imaging unit 5 is used to collect imaging images of different bands on the same imaging plane.

[0056] Furthermore, the photosensitive wavelength range of the imaging unit 5 is designed and optimized according to the required acquisition wavelength range.

[0057] Furthermore, after acquiring images of different wavelength bands, the imaging unit 5 can restore the image light intensity in combination with the attenuation rate of the light intensity attenuation sheet to ensure the authenticity and consistency of the acquired data.

[0058] This embodiment also proposes an imaging method based on the above multi-spectral synchronous imaging device, and the imaging method includes the following steps:

[0059] Step 1, incident light from each point of the target object 1 is formed into an approximately collimated light beam with a small angle with the main optical axis and a small diameter change through a collimated light path 2;

[0060] Step 2, the collimated light beam enters the step-by-step light splitting part 3, and is gradually separated into multiple single-band light beams through the transmission and reflection of the high-reflective narrow-band filter;

[0061] Step 3, the single-band light beam is subjected to light intensity regulation, direction adjustment and focusing of the reorganized optical path 4 to form closely arranged images in different imaging areas of the imaging unit 5;

[0062] Step 4: synchronously collect imaging images of different bands through the imaging unit 5, and perform light intensity restoration processing on the imaging images of different bands in combination with the attenuation rate to ensure data consistency.

[0063] This embodiment uses the above imaging device and imaging method to Figure 1 The target object 1 shown is imaged, and the luminous area of ​​the target object 1 is divided into four parts, namely the first luminous area 11, the second luminous area 12, the third luminous area 13 and the fourth luminous area 14, which emit four kinds of light with wavelengths of 600±1.5nm, 500±1.5nm, 450±1.5nm and 550±1.5nm respectively, among which the light intensities of the two wavelengths of 600±1.5nm and 500±1.5nm are stronger. The imaging process is as follows:

[0064] S1, the target object 1 is on the focal plane of the collimated light path, and the incident light from each luminous area of ​​the target object 1 passes through the collimated light path 2 to form an approximately collimated light beam, which contains four light rays with wavelengths of 600±1.5nm, 500±1.5nm, 450±1.5nm, and 550±1.5nm.

[0065] S2, the collimated light beam formed enters the step-by-step light splitting part 3, first passes through the first high-reflection narrow-band filter 301, the light with a wavelength of 600±1.5nm in the light beam passes through the first high-reflection narrow-band filter 301, and the other three light beams are reflected by the second reflector 31 and enter the second high-reflection narrow-band filter 302, the light with a wavelength of 550±1.5nm in the light beam passes through the second high-reflection narrow-band filter 302, and the other two light beams are reflected by the third reflector 32 and enter the third high-reflection narrow-band filter 3 03, the light with a wavelength of 450±1.5nm in the light beam passes through the third high-reflection narrow-band filter 303, and the last light is reflected by the fourth reflector 33 and enters the fourth high-reflection narrow-band filter 304. The light with a wavelength of 500±1.5nm in the light beam passes through the fourth high-reflection narrow-band filter 304. The imaging light beam of the target object 1 is divided into four imaging light beams with wavelengths of 600±1.5nm, 500±1.5nm, 450±1.5nm, and 550±1.5nm through the above process.

[0066] S3, four imaging light beams with wavelengths of 600±1.5nm, 500±1.5nm, 450±1.5nm and 550±1.5nm enter the rearranged optical path 4 respectively, among which, the imaging light beams of 600±1.5nm and 500±1.5nm have light intensities similar to those of 450±1.5nm and 550±1.5nm after passing through the second light intensity attenuation plate 412 and the first light intensity attenuation plate 411 respectively, and the four imaging light beams are redirected and compacted by the fifth reflector 421, the sixth reflector 422, the seventh reflector 423 and the eighth reflector 424 respectively, and are focused by the plano-convex lens 43 and imaged on the imaging unit 5.

[0067] S4, the imaging unit 5 synchronously collects imaging images of four imaging light beams of 600±1.5nm, 500±1.5nm, 450±1.5nm, and 550±1.5nm, which are respectively the first imaging image 61, the second imaging image 62, the third imaging image 63, and the fourth imaging image 64, and restores the original light intensity of the first imaging image 61 and the second imaging image 62 according to the attenuation rate of the first attenuation plate 411 and the second attenuation plate 412.

[0068] In the multi-spectral synchronous imaging device proposed in this embodiment, the target object light passes through the collimated optical path to form a collimated light beam that is approximately parallel to the main optical axis. When the collimated light beam passes through the step-by-step splitting part, it will be incident on the high-reflection narrow-band filters in turn. When entering the narrow-band filters, the corresponding transmission band light in the light beam will be transmitted, and the cut-off band light in the light beam will be reflected into the next high-reflection narrow-band filter. Finally, the collimated light beam will be divided into multiple single-band light beams of different bands and residual light beams. These single-band light beams are subjected to light intensity regulation, direction adjustment and refocusing of the rearranged optical path. Finally, the imaging of multiple single-band light beams is closely arranged in a smaller range. Through a single imaging unit, images of all bands can be collected, realizing efficient multi-spectral synchronous imaging, which has the advantages of high temporal and spatial resolution and flexible acquisition band design. It solves the problem of balancing temporal resolution and spatial resolution in existing multi-spectral imaging technology, and avoids the problems of low light intensity utilization and ghosting caused by the aperture segmentation method used in existing multi-spectral imaging technology. It is suitable for multi-spectral imaging requiring high temporal and spatial resolution, and shows significant advantages especially in the application of multi-band synchronous imaging of transient targets.

[0069] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A multi-spectral synchronous imaging device, characterized in that: include: A collimated light path, the collimated light path is used to receive the target light and collimate it into a nearly collimated light beam; A step-by-step light splitting part, which uses a selective transmission and reflection light splitting method to split the approximately collimated light beam output by the collimated light path step by step into a plurality of single-band light beams with different target bands; Rearranging the optical path, the reorganizing optical path is used to adjust the light intensity, direction and refocus the multiple single-band light beams output by the step-by-step light splitting part; And, an imaging unit, wherein the imaging unit is used to receive the multiple single-band light beams converged through the rearranged light path, and complete the synchronous acquisition of the multiple single-band light beam images.

2. A multi-spectral synchronous imaging device according to claim 1, characterized in that: The collimated light path includes at least one telephoto collimating convex lens, and the focal length of the telephoto collimating convex lens is greater than or equal to the maximum optical path of the collimated light beam; The maximum optical path is calculated from the outgoing light collimated by the telephoto collimating convex lens as the starting point, through the step-by-step light splitting part, and with the focus of the rearranged optical path as the end point.

3. A multi-spectral synchronous imaging device according to claim 1, characterized in that: The step-by-step light splitting part includes at least two highly reflective narrow-band filters, and the range of the transmission band and the reflection band are selected according to actual application requirements; The high-reflective narrow-band filter achieves high transmittance in a target band and high reflectivity in a non-target band.

4. A multi-spectral synchronous imaging device according to claim 3, characterized in that: The high-reflective narrow-band filters in the step-by-step light splitting part are arranged in sequence according to preset angles, so that the light beam reflected by the previous high-reflective narrow-band filter can accurately enter the next high-reflective narrow-band filter, forming a continuous band separation process.

5. A multi-spectral synchronous imaging device according to claim 4, characterized in that: The angle between the normal direction of the exit surface of the high-reflection narrow-band filter and the direction of the main optical axis light is an acute angle.

6. A multi-spectral synchronous imaging device according to claim 4, characterized in that: The high-reflective narrow-band filter of the step-by-step light splitting part can adjust the angle according to the light source characteristics and experimental requirements, so that the transmission path and reflection path of the light are optimized.

7. A multi-spectral synchronous imaging device according to any one of claims 1 to 6, characterized in that: The rearranged optical path includes at least one focusing convex lens, which is used to adjust the spot size and focusing position of the single-band light beam.

8. A multi-spectral synchronous imaging device according to claim 7, characterized in that: A light intensity attenuation plate is also provided in the reformed optical path for attenuating a single-band light beam whose light intensity is greater than its threshold.

9. A multi-spectral synchronous imaging device according to any one of claims 3 to 6, characterized in that: The photosensitivity range of the imaging unit covers the transmission bands of all high-reflection narrow-band filters in the step-by-step light splitting part.

10. An imaging method based on the multi-spectral synchronous imaging device according to any one of claims 1 to 9, characterized in that: include: After the target light is processed by the collimated optical path, a nearly collimated light beam is formed, the angle between the target light and the main optical axis is less than the threshold value; The approximately collimated light beam enters the step-by-step light splitting part, and is selectively transmitted and reflected in sequence, so as to separate multiple single-band light beams step by step; A plurality of single-band light beams enter the reorganized light path, undergo light intensity modulation, direction adjustment and refocusing, and finally converge at different imaging areas of the imaging unit; Images carrying information of different wavelength bands are synchronously collected by the imaging unit.

Images