Multi-sequence laser shadow imaging system capable of reducing stray light interference and application method

Abstract

The present invention discloses a multi-sequence laser shadow imaging system and application method capable of reducing stray light interference, relates to the field of ultra-high-speed laser transmission, includes a multi-sequence light source module, a multi-light source space separation device, the multi-light source space separation device includes: an optical fiber output end armor matched with each high-energy threshold optical fiber at the output end of the multi-sequence light source subsystem, a homogenizer arranged downstream of the optical fiber output end armor, characterized in that it also includes: a constraint component I for reducing stray light interference, the constraint component I includes: a light-shielding bottom plate arranged close to the homogenizer, a plurality of small holes matched with the diameters of each high-energy threshold optical fiber are provided on the light-shielding bottom plate; and a plurality of conical parts corresponding to each small hole are arranged on the light-shielding bottom plate. The present invention discloses a multi-sequence laser shadow imaging system and application method capable of reducing stray light interference, which can effectively reduce the interference of stray light and correspondingly improve the quality of sequence imaging.

Description

Technical Field

[0001] The present invention relates to the field of ultra-high-speed laser transmission and ultra-high-speed sequence imaging, and more specifically, to a multi-sequence laser shadow imaging system and an application method capable of reducing stray light interference. Background Art

[0002] With the development of my country's aerospace technology, weapons and equipment, and basic disciplines, research in the fields of ultra-high-speed aerodynamics, ultra-high-speed collisions, explosions and impacts, combustion and chemical reactions has continued to deepen. In these research works, many phenomena are ultra-high-speed transient change processes that last only microseconds or even nanoseconds. It is necessary to have an ultra-high-speed sequence imaging technology that can clearly and continuously image and record this process in order to grasp the essence of physical phenomena. Ultra-high-speed sequence imaging currently mainly uses two types of microchannel plate (MCP) technology. One is to use a single-channel MCP high-speed camera with a maximum image pixel of about 1.3 million (with the development of technology, the pixel will increase, but it is difficult to exceed 10 million). The amplitude frequency is inversely proportional to the image pixel. For example, the amplitude frequency is about 20,000 frames / second at full frame, and the pixel is about 20,000 when the maximum amplitude frequency is 1 million frames / second. The other uses a split-frame imaging method. When shooting 4 images, 4 imaging channels are required, and each channel corresponds to an image receiving device. At present, its amplitude frequency can be greater than 100 million frames / second.

[0003] Due to the ultra-high-speed imaging using the MCP method, it is difficult for the image pixels to exceed 10 million, and high-resolution imaging cannot be achieved. To this end, the China Aerodynamics Research and Development Center has developed a variety of models of 10ns-class ultra-high sequence laser shadow imagers based on the "multi-light source spatial separation technology". The image pixels obtained by each model of the instrument are greater than 10 million, which can achieve a higher imaging resolution. The imaging principle of this instrument is to use multiple pulsed laser beams to flash sequentially according to the set picosecond to microsecond time interval. After the laser beam is collimated, it passes through the test area and converges into the imaging end. The imaging end uses frame imaging to achieve that each CCD target surface only receives information about one laser beam passing through the test area, thereby achieving high imaging resolution under high amplitude frequency. This type of product mainly uses the core technology of "multi-light source spatial separation" to achieve different sequence beams corresponding to one imaging channel. The corresponding technical parameters of the multi-light source spatial separation device will directly affect the quality of the entire product. For example, the beam homogenization effect and the multi-light source spatial separation angle size parameters in the multi-light source spatial separation device have a great influence on the uniformity of the imaging spot, the elimination of stray light interference, and the overlap of the test area. However, the parameters such as laser beam homogenization and the spatial separation angle of multiple light sources restrict each other. In order to eliminate the speckle and coherence characteristics of the laser beam and increase the beam homogenization effect, optical elements such as frosted glass are used. However, the use of frosted glass will change the propagation direction of the laser beam, causing the beam to scatter at multiple angles. The beams at some angles will enter the imaging end in the form of stray light, resulting in extremely strong stray light when sequential imaging cannot be performed. This stray light will interfere with normal image information, resulting in a decrease in image quality, making the obtained image have Figure 5 The bright line A in Figure 6 The bright lines B in the figure are actually caused by interference from other sequence light beams.

[0004] In summary, the current ultra-high-speed multi-sequence laser shadow imaging instruments involve multiple laser optical paths, such as a coaxial ultra-high-speed multi-sequence laser shadow imaging device with application number: 202111626236.2, but the inherent coherence characteristics of the laser will produce a large number of speckles, which are easy to produce noise on the imaging surface. In order to eliminate the coherence characteristics of the laser beam, homogenization technology is required, but the original geometric transmission direction of the beam will be disrupted during homogenization. When different sequences are imaged, the beams of different optical paths will interfere, causing the loss of useful information on multiple sequence images. In order to reduce this interference, if the separation distance of different sequence beams is simply increased, the overlap of different sequence imaging test areas will be reduced, affecting the test effect.

[0005] It should be noted that in the prior art of sequential laser shadow photography systems, pinhole structures are also used, such as the pinhole filter device for sequential laser shadow photography systems with application number: 201410342898.0, but the pinhole structure is placed at the imaging end and is mainly used for filtering (spectral splitting), and cannot achieve the purpose of reducing interference (noise reduction). Summary of the invention

[0006] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0007] In order to achieve these purposes and other advantages of the present invention, a multi-sequence laser shadow imaging system capable of reducing stray light interference is provided, comprising a multi-sequence light source module, a multi-light source space separation device, a collimation module, an imaging module, a controller, and a data acquisition and processing module, wherein the multi-light source space separation device comprises: an optical fiber output end armor matched with each high energy threshold optical fiber at the output end of the multi-sequence light source subsystem, and a homogenizing plate arranged downstream of the optical fiber output end armor, characterized in that it also comprises: a constraint component I for reducing stray light interference, wherein the constraint component I comprises:

[0008] A light shielding bottom plate is arranged close to the homogenizing plate, and a plurality of small holes matching the diameters of the high energy threshold optical fibers are provided on the light shielding bottom plate;

[0009] A plurality of cone-shaped parts are arranged on the light-shielding bottom plate and correspond to the small holes;

[0010] Among them, a conical hole connected to the corresponding small hole is arranged inside the conical part, and the diameter of the small end of the conical hole is consistent with the diameter of the small hole, and the diameter of the large end of the conical hole matches the parameters of the collimation module. The matching means that the laser beam emitted by each conical hole can completely fill the collimation module.

[0011] Preferably, the core diameter of each high energy threshold optical fiber is 1.5 mm;

[0012] The homogenizing sheet is a frosted glass sheet with a thickness of 1 mm, a material of BK7, a refractive index of 1.580, and an Abbe constant of 64.169998;

[0013] The material of the light shielding bottom plate is configured to be a black aluminum material with a thickness of 1 mm and a small hole diameter of 1.5 mm;

[0014] The material of the conical piece is configured to be black aluminum material, the depth of the conical hole is 5 mm, and the diameter of the small end of the conical hole is 1.5 mm;

[0015] The relative aperture of the collimation module is 1:10.

[0016] Preferably, it further comprises: a plurality of constraint components II arranged in the imaging module, each constraint component II being a rotating disk;

[0017] Wherein, the disc is provided with special-shaped holes matching with the corresponding sequence light beams.

[0018] Preferably, the material of the disc is configured to be black aluminum material, and the disc has a diameter of 12 mm and a thickness of 1 mm. The special-shaped hole is a triangular hole, and the angle close to the center of the disc is 30°.

[0019] An application method of a multi-sequence laser shadow imaging system, which is applied in a multi-sequence laser shadow imaging system capable of reducing stray light interference, the application method comprising:

[0020] Each set of sequence light beams in the multi-sequence light source module is output to the homogenizer through the corresponding high-energy threshold optical fiber for homogenization processing;

[0021] The homogenized light beam passes through the corresponding small holes on the light shielding bottom plate to remove the interference of the imaging light beam;

[0022] The light beam output from the small hole passes through the conical hole to filter the light beams whose divergence angles do not meet the requirements in the sequence light beams;

[0023] The filtered light passes through the collimation module and becomes a parallel beam, which converges into the imaging module through the test area;

[0024] The imaging module adopts equal optical path framing, and a constraint component II with a triangular opening is placed at the convergence point of the light beam in front of the photosensitive medium of each sequence imaging to block the passage of other sequence light beams;

[0025] The light beam passing through the triangular hole images the test area on the corresponding camera target surface, so that the data acquisition and processing module can perform corresponding image acquisition and transmission to complete the recording of test area information of different sequences.

[0026] The present invention includes at least the following beneficial effects: for the existing multi-sequence laser shadow imaging system, the present invention adds a constraint component I to the core component (i.e., the light source end) of the multi-light source spatial separation device, utilizes the small holes provided on the constraint component I to reduce stray light interference (noise reduction) in imaging, and places a rotatable disk with a triangular hole in the imaging module to eliminate interference from other non-imaging light beams and achieve higher imaging resolution.

[0027] Furthermore, by designing the parameters of the small hole, conical hole in constraint component I and the triangular hole in constraint component II of the present invention, after satisfying the beam homogenization and coupling of multiple beams through optical fibers, they can be integrated in a minimum circle manner, which not only reduces the interference of stray light, but also improves the overlap of the test area and the imaging resolution during multiple sequence imaging, thereby correspondingly improving the sequence imaging quality.

[0028] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structural layout of the multi-sequence laser shadow imaging system of the present invention;

[0030] Figure 2 It is a schematic structural diagram of the multi-light source spatial separation device of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of a disc with a triangular hole of the present invention;

[0032] Figure 4 To adopt the multi-sequence laser shadow imaging system of the present invention, and thereby obtain sequence shadow images without interference;

[0033] Figure 5 A sequence shadow image with bright lines is obtained by using a multi-sequence laser shadow imaging system in the prior art;

[0034] Figure 6 Another type of sequence shadow image with bright lines is obtained by using the multi-sequence laser shadow imaging system in the prior art;

[0035] Among them, there are multi-pulse laser light source-1, fiber coupler-2, high energy threshold fiber-3, fiber output end armor-4, laser beam-5, collimator-6, test area-7, imaging mirror-8, imaging module-9, data acquisition and processing module-10, controller-11, cylindrical hole-401, homogenizer-402, shading bottom plate-403, small hole-404, conical hole-405, disk-901, triangular hole-902, rotating axis-903. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0037] In view of the above-mentioned stray light interference problem that needs to be solved in multi-sequence imaging of ultra-high-speed target change processes, the present invention designs a small hole in the multi-light source spatial separation device to reduce stray light interference, which can not only maintain the arrangement of multiple optical fiber output ends under a smaller circumference, thereby achieving higher coaxiality of different sequence imaging light paths, but also realize the homogenization of the laser beam, eliminate the coherence characteristics of the laser beam and remove speckle.

[0038] Specifically, the multi-sequence laser shadow imaging system in the prior art mainly includes: a multi-sequence light source module, a multi-light source spatial separation device, a collimation module, an imaging module 9, a controller, and a data acquisition and processing module 10; each set of sequence light source modules in the multi-sequence light source module includes: a multi-pulse laser light source 1, a fiber coupler 2, and a high-energy threshold optical fiber 3; the multi-light source spatial separation device includes: an optical fiber output end armor 4, a homogenizer 402, and a constraint component I; the collimation module includes a collimating mirror 6 and an imaging mirror 8.

[0039] The light beam emitted from the multi-pulse laser light source 1 enters the high-energy threshold optical fiber 3 through the optical fiber coupler 2. The high-energy threshold optical fiber 3 transmits the laser beam to the optical fiber output end armor 4. The laser beam 5 passes through the collimator 6 to form a parallel light beam. The parallel light beam passes through the test area 7 and enters the imaging mirror 8. The imaging mirror 8 converges the parallel light beam and enters the imaging module 9. The imaging module 9 performs equal optical path splitting on the light beam to form multiple light beams. The data acquisition and processing module 10 images the images of the test area 7 at different times and performs remote transmission and processing of the images. The controller 11 controls the multi-sequence laser source system 1 to flash at different times, and at the same time controls the data acquisition and processing module 10 to turn on the camera and collect images within a certain flash time period.

[0040] Generally speaking, in order to homogenize the light beam in the multi-light source space separation device, a similar homogenizing device such as a frosted glass sheet is used. After the light beam passes through these devices, the laser beam no longer propagates completely in the original direction, and part of the light beam diverges at multiple angles. During sequence imaging, since different sequence light beams correspond to one channel of the imaging module 9, but when one sequence is imaged, the imaging channel of another sequence is still turned on, so that after passing through the homogenizing device, part of the scattered light beam will be recorded by other sequence channels in the form of stray light, and different sequence light beams will interfere with each other, causing the image information of the test area at different times to interfere with each other. This interference is mainly manifested in that the light beams of non-corresponding sequences are received by the CCD target surface of the corresponding sequence, affecting the normal photosensitization of the test target image and the image background, and useful information is covered by the interference light and the background becomes uneven. In order to reduce this interference, usually only the spatial distance between the light beams at the output end of the optical fiber can be increased, but this will reduce the overlap of imaging light beams of different sequences passing through the same test area. On the one hand, the effective common test area is reduced. On the other hand, the increase in spatial distance increases the angle of the optical axis of different sequences, thereby increasing the inconsistency of the projection angle of the test area between light beams of different sequences. The background shadow images of different sequences are quite different, especially for thin plate-shaped objects.

[0041] See also Figure 2The present invention places a constraint component I at the beam homogenization end, and the constraint component I is used to limit the beam with a larger divergent beam angle. Each small hole 404 in the constraint component I can only pass the beam within a certain angle range in the corresponding sequence of beams, so that different sequence beams will not interfere with each other in the imaging module 9. Specifically, the constraint component I of the present invention reduces stray light interference in the multi-light source space separation device, and the constraint component I includes:

[0042] A light shielding bottom plate 403 is arranged close to the homogenizing plate 402 (used to block other non-corresponding sequence light beams from entering the corresponding sequence small holes 404 during a certain sequence imaging, so as to reduce the interference of the non-sequential imaging light beams on the sequence imaging light beams), and a plurality of small holes 404 matching the diameters of the high energy threshold optical fibers 3 are provided on the light shielding bottom plate;

[0043] A plurality of conical members and circular members are arranged on the light-shielding bottom plate 403 and correspond to the small holes 404, and a conical hole 405 (also called a conical hole, used to further limit the divergence angle of the corresponding sequence light beam in a certain sequence imaging, to prevent the light beam that does not meet the divergence angle from entering the test area, the collimation module and the imaging module 9, and to reduce the formation of stray light. By reducing the stray light, a plurality of optical fiber output ends can be arranged under a smaller circumference, thereby achieving a higher coaxiality of different sequence imaging light paths, that is, the light beam with a divergence angle that does not meet the requirement in the sequence light beam is filtered by the conical hole to enter the imaging light path, thereby reducing the mutual interference of different sequence light beams in the imaging system).

[0044] Working principle: The cylindrical hole 401 in the armor 4 at the output end of the optical fiber is used to place multiple high-energy threshold optical fibers 3. In order to eliminate the coherence of the laser beam and achieve homogenization of the laser beam, a homogenizer 402 is placed at the front end of the armor 4 at the output end of the optical fiber, and a light-shielding base plate 403 is placed close to the homogenizer 402. A small hole 404 with the same diameter as the high-energy threshold optical fiber 3 is opened on the light-shielding base plate 403, and multiple conical parts are placed on the surface of the light-shielding base plate 403. A conical hole 405 is provided in each conical part. The diameter of the smallest hole of the conical hole 405 is consistent with the small hole 404, and the diameter of the largest hole of the conical hole 405 needs to match the parameters of the collimator 6. The matching principle is that the laser beam 5 can completely fill the collimator 6. Theoretically, the longer the length of the conical hole 405, the better, so that the laser beam whose divergence angle emitted from the small hole 403 does not meet the requirements can be better limited. In actual design, it is necessary to consider the space requirements for the placement of multiple conical holes 405.

[0045] In the present invention, the constraint component I is configured as a light shielding bottom plate 403 with a small hole 404 and a plurality of conical parts with conical holes 405. The diameters of the two ends of the conical hole 405 are different. The smaller hole size of the cone is the diameter of the optical fiber. The length of the cone and the larger hole diameter are based on the light beam emitted from the output end of the optical fiber being able to fill the collimation module. In order to prevent the light of other light beams outside the conical hole 405 from entering the collimation module and eventually entering the imaging module 9 to form stray light, a light shielding bottom plate is placed at other places except the light-through hole at the smaller diameter of the conical hole 405, so that other sequence light beams cannot enter the conical holes 405 of other corresponding sequences, and cannot directly enter the collimation module and enter the test area and the imaging module 9, thereby maximally avoiding mutual interference between light beams of different sequences.

[0046] In practical applications of the present invention, each set of sequence light source modules in the multi-sequence light source module generates a corresponding sequence light beam, and each set of sequence light beams corresponds to a small hole 404 in the constraint component I at the output end of the optical fiber. The pulsed laser beam emitted from the small hole 404 becomes a parallel light beam after passing through the collimation module. The parallel light beam passes through the test area and converges into the imaging module 9. The data acquisition and processing module collects and transmits the image in the imaging module 9. The multi-sequence light source module performs pulse laser flash according to the timing given before use. After the flashing laser beam passes through the test area, it transmits the information carrying the test target to the imaging module 9, thereby recording the test area information of different sequences.

[0047] Furthermore, in the prior art, in order to achieve the splitting of different sequence light beams, it is necessary to use a small hole of a special shape. On the one hand, this small hole allows the corresponding sequence light beam in the imaging module to pass through, and on the other hand, it is necessary to completely block the light of other sequence light beams from passing through the small hole. In this way, when the light of the corresponding sequence light beam is imaged, interference from other sequence light beams will be avoided. This small hole is usually placed at the convergence of the light beams. According to this sequence imaging optical path structure, the brighter area of ​​the light spot at the convergence of the light beams is circular, and a weaker high-frequency information light beam is diffused around it. This light beam with high-frequency information is almost invisible to the naked eye because it is weak, and it is also easily ignored in the optical path, resulting in small circular holes often used in the optical path to allow the sequence light beams to pass through. This circular hole will block the surrounding high-frequency information in the light beam. Because the high-frequency information includes detailed information of the test area, this information will greatly reduce the imaging resolution after being blocked, that is, the circular small hole commonly used in the prior art will lose the high-frequency information in the light beam, and the image details will be lost, which greatly reduces the imaging resolution.

[0048] To solve the above problems, see Figure 3In the present invention, a disk 901 with a rotating shaft 903 and triangular holes 902 at different angles is placed at the corresponding sequential light beam convergence position in the imaging module 9. The triangular hole 902 is located at the brightest spot of the corresponding sequential light beam convergence position. On the one hand, the corresponding sequential light beam is allowed to pass through, while blocking other sequential light beams from passing through. The triangular hole 902 can pass more light beams with high-frequency information, thereby improving the imaging resolution. That is, the present invention can increase the imaging resolution by using triangular small holes to allow high-frequency information to pass through while eliminating interference from other sequential light beams.

[0049] Example:

[0050] See also Figure 1 The multi-pulse laser light source 1 emits four different laser beams in a certain time sequence through the controller 11. The laser beams of different sequences enter different high-energy threshold optical fibers 3, optical fiber output end armor 4 and collimator 6 through different couplers 2 to form parallel beams. The parallel beams at four different times pass through the test area 7 and enter the imaging mirror 8. The imaging module 9 records the shadow profiles of the test area 7 at different sequence times. The data acquisition and processing module 10 collects and remotely transmits the obtained shadow images. The relative aperture of the collimator 6 is 1:10.

[0051] See also Figure 2 The output ends of the four high energy threshold optical fibers 3 are placed in the cylindrical hole 401 in the optical fiber output end armor 4, and the core diameter of the high energy threshold optical fiber 3 is 1.5 mm. The homogenizer 402 is a frosted glass sheet with a thickness of 1 mm, a material of BK7, a refractive index of 1.580, and an Abbe constant of 64.169998. The light shielding bottom plate 403 is a blackened aluminum material with a thickness of 1 mm, and the diameter of the small hole 404 is 1.5 mm. The conical hole 405 is a blackened aluminum material with a depth of 5 mm and a minimum hole diameter of 1.5 mm. According to the relative aperture of the collimator 6, the maximum hole diameter of the conical hole 405 is determined to be 2 mm.

[0052] A rotatable disk is arranged in the imaging module, each disk has triangular holes of different angles, each triangular hole corresponds to a corresponding sequence light beam, and by opening a triangular hole on the disk, and the triangular hole can rotate on the disk, the corresponding sequence imaging can be allowed to pass through to the maximum extent and other corresponding sequence light beams can be blocked;

[0053] Specifically, see Figure 3, four rotatable disks 901 are placed in four corresponding sequence imaging optical paths in the imaging module 9, and the rotation angle of each disk 901 is determined according to the position of the beam convergence point in front of the imaging target surface in the corresponding sequence beam in the imaging module 9 sequence, and ensure that the stronger light spot of the corresponding sequence beam can pass through and the stronger light spot of other sequence beams cannot pass through the triangular hole 902 of the corresponding disk 901, the disk material is configured to use black aluminum material, the disk diameter is 12mm, the thickness is 1mm, the angle of the triangular hole close to the center of the disk is 30°, the filtered light speed passes through the collimation module and becomes a parallel beam, and converges into the imaging module through the test area. The imaging module adopts equal optical path framing, and a triangular hole is placed at the beam convergence point in front of the photosensitive medium of each sequence imaging, on the one hand, the corresponding sequence beam is allowed to pass under the premise of retaining high-frequency information, and at the same time, other sequence beams are blocked from passing through, eliminating the interference of other sequence beams on the imaging sequence beam, and the test area is imaged on the corresponding camera target surface after the beam passes through the triangular hole, so that the data acquisition and processing module can perform corresponding image acquisition and transmission, and complete the recording of the test area information of different sequences.

[0054] Through the above embodiments, the following is obtained: Figure 4 The sequence shadow images without interference are shown.

[0055] The above solution is only an illustration of a preferred embodiment, but is not limited thereto. When implementing the present invention, appropriate replacement and / or modification can be performed according to user needs.

[0056] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0057] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A multi-sequence laser shadow imaging system capable of reducing stray light interference, comprising a multi-sequence light source module, a multi-light source space separation device, a collimation module, an imaging module, a controller, and a data acquisition and processing module, wherein the multi-light source space separation device comprises: The optical fiber output end armor matched with each high energy threshold optical fiber at the output end of the multi-sequence light source subsystem, and the homogenizer arranged downstream of the optical fiber output end armor, are characterized in that they also include: a constraint component I for reducing stray light interference, and the constraint component I includes: A light shielding bottom plate is arranged close to the homogenizing plate, and a plurality of small holes matching the diameters of the high energy threshold optical fibers are provided on the light shielding bottom plate; A plurality of cone-shaped parts are arranged on the light-shielding bottom plate and correspond to the small holes; Among them, a conical hole connected to the corresponding small hole is arranged inside the conical part, and the diameter of the small end of the conical hole is consistent with the diameter of the small hole, and the diameter of the large end of the conical hole matches the parameters of the collimation module. The matching means that the laser beam emitted by each conical hole can completely fill the collimation module.

2. The multi-sequence laser shadow imaging system capable of reducing stray light interference as claimed in claim 1, characterized in that: The core diameter of each high energy threshold optical fiber is 1.5 mm; The homogenizing sheet is a frosted glass sheet with a thickness of 1 mm, a material of BK7, a refractive index of 1.580, and an Abbe constant of 64.169998; The material of the light shielding bottom plate is configured to be a black aluminum material with a thickness of 1 mm and a small hole diameter of 1.5 mm; The material of the conical piece is configured to be black aluminum material, the depth of the conical hole is 5 mm, and the diameter of the small end of the conical hole is 1.5 mm; The relative aperture of the collimation module is 1:

10.

3. The multi-sequence laser shadow imaging system capable of reducing stray light interference as claimed in claim 1, characterized in that: Also includes: A plurality of constraint components II are arranged in the imaging module, each constraint component II is a rotating disk; Wherein, the disc is provided with special-shaped holes matching with the corresponding sequence light beams.

4. The multi-sequence laser shadow imaging system capable of reducing stray light interference as claimed in claim 3, characterized in that: The material of the disc is configured to be black aluminum material, and the disc has a diameter of 12 mm and a thickness of 1 mm. The special-shaped hole is a triangular hole, and the angle close to the center of the disc is 30°.

5. An application method of a multi-sequence laser shadow imaging system, which is applied in the multi-sequence laser shadow imaging system capable of reducing stray light interference as claimed in any one of claims 1 to 4, characterized in that: The application method comprises: Each set of sequence light beams in the multi-sequence light source module is output to the homogenizer through the corresponding high-energy threshold optical fiber for homogenization processing; The homogenized light beam passes through the corresponding small holes on the light shielding bottom plate to remove the interference of the imaging light beam; The light beam output from the small hole passes through the conical hole to filter the light beams whose divergence angles do not meet the requirements in the sequence light beams; The filtered light passes through the collimation module and becomes a parallel beam, which converges into the imaging module through the test area; The imaging module adopts equal optical path framing, and a constraint component II with a triangular opening is placed at the convergence point of the light beam in front of the photosensitive medium of each sequence imaging to block the passage of other sequence light beams; The light beam passing through the triangular hole images the test area on the corresponding camera target surface, so that the data acquisition and processing module can perform corresponding image acquisition and transmission to complete the recording of test area information of different sequences.

Images