A device and method for simulating far-field to target laser parameters

Abstract

The present application relates to a device and method for simulating far-field to target laser parameters, which includes: a laser emission system; a spot adjustment system, which is used to adjust the spot shape and beam size of the laser beam emitted by the laser emission system and to control the laser beam jitter; an incident angle adjustment system, which is used to drive the spot adjustment system to rotate around the laser irradiation point to adjust the incident angle of the laser beam output by the spot adjustment system to reach the target target impact point. The present invention can simulate the target laser parameters such as the spot size, spot morphology, laser incident angle and jitter state of the target surface in the external field long-distance transmission, realize the simulation of the external field target irradiation process, collect laser damage data in a near-real environment, and obtain key damage data, which can provide important support for the demonstration of laser equipment indicators and system development.

Description

Technical Field

[0001] The present application relates to the technical field of laser damage effect testing, and in particular to a device and method for simulating far-field to target laser parameters. Background Art

[0002] At present, with the development of laser technology, laser damage technology has received more and more attention as a core key technology for laser equipment demonstration and prototype development. The spot on the surface of a specific part of the target after long-distance transmission is affected by the high-frequency movement of the fast mirror of the optoelectronic tracking system and atmospheric turbulence. The spot on the target surface is in a high-frequency jitter state, resulting in a diffuse spot distribution, a larger spot size, and a lower power density. At the same time, there is a relative motion relationship between the target and the laser source, resulting in a dynamic change in the target surface power density, spot size, and incident angle.

[0003] In the early stage, domestic and foreign scholars focused on the research of laser damage effect test technology, mainly focusing on the case of fixed spot size, power density or incident angle, without simulating the diffuse spot morphology, dynamic change and jitter state of the spot after long-distance transmission in the field. At present, there is still a blank in the research of laser damage effect test technology under the condition of target spot parameter simulation in the field long-distance transmission environment. Summary of the invention

[0004] The embodiments of the present application provide a device and method for simulating far-field to target laser parameters, so as to solve the problem that there is still a lack of research on laser damage effect testing technology under the condition of target spot parameter simulation in an external field long-distance transmission environment.

[0005] In a first aspect, a device for simulating far-field to target laser parameters is provided, comprising:

[0006] Laser launch system;

[0007] A spot adjustment system, which is used to adjust the spot shape and beam size of the laser beam emitted by the laser emission system and to control the laser beam jitter;

[0008] The incident angle adjustment system is used to drive the light spot adjustment system to rotate around the laser irradiation point to adjust the incident angle of the laser beam output by the light spot adjustment system to reach the target impact point.

[0009] In some embodiments, the light spot adjustment system includes a beam shaping device, a beam size adjustment device, and a beam jitter control device which are linearly arranged in sequence with the laser emission system;

[0010] The beam shaping device is used to shape the received laser beam;

[0011] The beam size adjustment device is used to expand the shaped laser beam;

[0012] The beam jitter control device is used to control the jitter frequency of the expanded laser beam.

[0013] In some embodiments, the light beam jitter control device comprises:

[0014] A reflecting mirror, which is used to reflect the laser beam expanded by the beam size adjusting device;

[0015] The fast reflection mirror is used for receiving the laser beam reflected by the reflection mirror and outputting the laser beam after it is shaken at a set frequency.

[0016] In some embodiments, the incident angle adjustment system includes:

[0017] A parallel multi-link mechanism, comprising an active rod and a driven rod, and a plurality of connecting rods connected between the active rod and the driven rod, wherein the light spot adjustment system is fixed on the driven rod;

[0018] The driving mechanism is used to drive the active rod to move so that the driven rod can rotate around the laser irradiation point.

[0019] In some embodiments, the parallel multi-link mechanism further includes a fixed rod, the active rod is hinged to the fixed rod, and the driving mechanism drives the active rod to rotate around a connection point between the active rod and the fixed rod.

[0020] In some embodiments, the spot adjustment system outputs a laser beam parallel to the driven rod.

[0021] In some embodiments, the laser generating system includes a collimating head for outputting a laser beam.

[0022] In some embodiments, the driving mechanism includes a control computer for controlling the rotation speed of the active rod.

[0023] In a second aspect, the embodiment of the present application further provides a method for simulating far-field to target laser parameters, comprising the following steps:

[0024] The laser emission system emits the laser beam, and the laser control software dynamically controls the output laser power;

[0025] The beam shaping device shapes the laser beam to simulate the far-field spot shape;

[0026] The beam size adjustment device expands the shaped laser beam;

[0027] The beam jitter control device makes the laser beam after beam expansion jitter and then outputs it;

[0028] The incident angle adjustment system adjusts the incident angle of the jittered laser beam reaching the target impact point.

[0029] In some embodiments, the incident angle adjustment system causes the jittered laser beam to rotate around the laser irradiation point to adjust the incident angle of the laser beam reaching the target impact point.

[0030] The beneficial effects of the technical solution provided by this application include:

[0031] The embodiments of the present application provide a device and method for simulating far-field to target laser parameters. Since a spot adjustment system is provided to adjust the spot shape and beam size of the laser beam and control the laser beam jitter, an incident angle adjustment system is also provided to adjust the incident angle of the laser beam output by the spot adjustment system to reach the target impact point, that is, the laser incident angle is changed while the laser irradiation point is kept unchanged. Therefore, the target laser parameters such as the spot size, spot morphology, laser incident angle and jitter state of the target surface transmitted over a long distance in the external field can be simulated, the external field target irradiation process simulation is realized, the laser damage data in a near-real environment is collected, and the key damage data is obtained, which can provide important support for the demonstration of laser equipment indicators and system development. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram of the structure of a device for simulating far-field to target laser parameters provided in an embodiment of the present application;

[0034] Figure 2 A top view of a spot adjustment system in a device for simulating far-field to target laser parameters provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the structure of a device for simulating far-field to target laser parameters provided in an embodiment of the present application in conjunction with a wind tunnel device to conduct a laser damage effect test in an outdoor environment.

[0036] In the figure: 1. Laser; 2. Collimator; 3. Beam shaping device; 4. Beam size adjustment device; 5. Reflector; 6. Fast-reflecting mirror; 7. Active rod; 8. Fixed rod; 9. Driven rod; 10. Long connecting rod; 11. Short connecting rod; 12. Mounting plate; 13. Drive block; 14. Servo motor; 15. Control computer; 16. Electric screw; 17. Mounting shaft; 18. Wind tunnel; 19. Target model; 20. Light guide window; 21. Photoelectric detection module; 22. Contact temperature test equipment; 23. Non-contact temperature test equipment; 24. Camera. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] The embodiment of the present application provides a device for simulating far-field to target laser parameters, which can solve the problem that there is still a blank in the research of laser damage effect testing technology under the condition of target spot parameter simulation in the external field long-distance transmission environment.

[0039] Reference Figure 1-3 As shown, the device for simulating far-field to target laser parameters provided in this embodiment includes a laser emission system, a spot adjustment system and an incident angle adjustment system.

[0040] The laser emission system includes a laser 1 and a collimator head 2. The laser 1 generates laser light and outputs it through the collimator head 2. In this embodiment, the beam diameter is 8 mm and the wavelength is 1080 nm. Of course, in other embodiments, other values ​​may be set according to actual test requirements.

[0041] The spot adjustment system includes a beam shaping device 3, a beam size adjustment device 4 and a beam jitter control device which are linearly arranged in sequence with the laser emission system. The collimation head 2 is arranged between the laser 1 and the beam shaping device 3, and the laser beam passes through the beam shaping device 3, the beam size adjustment device 4 and the beam jitter control device in sequence.

[0042] The beam shaping device 3 is used to shape the laser beam and change the laser beam spot shape to simulate the far-field to target spot shape; the beam size adjustment device 4 is used to adjust the laser beam size to achieve the purpose of simulating the far-field to target spot size. In this embodiment, the light inlet diameter of the beam size adjustment device 4 is 15 mm, and the light outlet diameter is 80 mm. In other embodiments, the size and ratio of the light inlet and the light outlet can also be changed according to actual needs.

[0043] The beam dithering device includes a reflector 5 and a quick mirror 6. The reflector 5 is arranged on the path of the laser beam output by the beam size adjusting device 4, and makes the laser beam turn and input to the quick mirror 6. The quick mirror 6 then dithers the laser beam and outputs it, and makes the output laser beam consistent with the direction of the laser beam output by the beam size adjusting device 4, so as to simulate the beam dithering state in the far field environment. In this embodiment, the parameters of the quick mirror 6 are: lens diameter 100mm, closed-loop bandwidth 500Hz, travel ±25mrad. Of course, in other embodiments, quick mirrors 6 with different performance parameters can be selected according to actual needs.

[0044] The incident angle adjustment system includes a parallel multi-link mechanism and a driving mechanism. The driving mechanism controls the operation of the parallel multi-link mechanism, and the parallel multi-link mechanism controls the movement of the laser emission system and the spot adjustment system to adjust the incident angle of the laser beam reaching the target impact point.

[0045] Among them, the parallel multi-link mechanism includes an active rod 7, a fixed rod 8 and a driven rod 9 of equal length. The active rod 7 is parallel to the laser beam output by the spot adjustment system. The fixed rod 8 is fixedly arranged. One end of the active rod 7 is rotatably connected to one end of the fixed rod 8 and the rotation axis is perpendicular to both the active rod 7 and the fixed rod 8. The driven rod 9 is parallel to the active rod 7. The end of the active rod 7 away from the fixed rod 8 is connected to a long connecting rod 10. The end of the long connecting rod 10 is rotatably connected to the end of the active rod 7. One end of the driven rod 9 is rotatably connected to the end of the long connecting rod 10 away from the active rod 7. The end of the fixed rod 8 away from the active rod 7 is connected to the same long connecting rod 10. The end of the fixed rod 8 is rotatably connected to the end of the long connecting rod 10. A long connecting rod 10 is rotationally connected at the midpoint, and a short connecting rod 11 is connected to one end of the driven rod 9 away from the long connecting rod 10, and the end of the short connecting rod 11 is rotationally connected to the end of the driven rod 9, and the end of the short connecting rod 11 away from the driven rod 9 is rotationally connected to the end of the long connecting rod 10 connected to the fixed rod 8. The short connecting rod 11 is equal in length to the active rod 7 and its length is 1 / 2 of the long connecting rod 10, and the rotation axis of each rotation connection is parallel to the rotation axis of the rotation connection between the active rod 7 and the fixed rod 8; the driving mechanism drives the active rod 7 to rotate around the connection point with the fixed rod 8; the laser emission system and the light spot adjustment system are both arranged on the driven rod 9, and the laser beam output by the light spot adjustment system is in a straight line with the driven rod 9.

[0046] In this embodiment, a mounting plate 12 is fixed on the driven rod 9 , and the collimating head 2 and the light spot adjustment system are both mounted on the mounting plate 12 .

[0047] When the driving mechanism drives the active rod 7 to rotate, the long connecting rod 10 and the short connecting rod 11 are linked to make the driven rod 9 rotate with a point on its extension line as the center. During the test, the impact point of the far-field target is set here, so that the laser beam can rotate with the target as the center, thereby achieving the purpose of ensuring that the laser irradiation point remains unchanged while the incident angle of the light beam changes.

[0048] The driving mechanism includes a driving block 13, a servo motor 14, a control computer 15 and a connecting piece. The driving block 13 is slidably connected to the active rod 7 and the sliding direction is consistent with the length direction of the active rod 7. The servo motor 14 is connected to the driving block 13 through the connecting piece. The driving block 13 is also rotationally connected to the active rod 7 and the rotation axis is parallel to the rotation axis of the active rod 7. The servo motor 14 controls the driving block 13 to slide along a straight line through the connecting piece and the sliding direction is perpendicular to the rotation axis of the active rod 7. The control computer 15 controls the operation of the servo motor 14.

[0049] Specifically, a slide groove is opened on the active rod 7 along the length direction, the driving block 13 is set to be cylindrical, and the driving block 13 is arranged in the slide groove with its axis parallel to the rotating axis of the active rod 7; the connecting member is an electric screw 16 or an electric push cylinder. In this embodiment, the electric screw 16 is selected. Specifically, the driving mechanism also includes a mounting shaft 17, which is arranged along the sliding direction of the driving block 13, and a mounting groove is opened on the mounting shaft 17 along the length direction. The electric screw 16 is arranged in the mounting groove and the length direction is consistent with the mounting groove, and the driving block 13 is connected to a mounting block threadedly assembled with the electric screw 16, and the mounting block is arranged in the mounting groove; the electric screw 16 is connected to the servo motor 14.

[0050] In this embodiment, the rotational angular velocity of the driven rod 9 can be adjusted in the range of 0.5° / S to 15° / S, and the incident angle adjustment system adjusts the incident angle of the laser beam to a range of ±60 degrees; correspondingly, the acute angle formed by the sliding direction of the driving block 13 and the length direction of the fixed rod 8 is 30°, that is, the acute angle formed by the mounting shaft 17 and the fixed rod 8 is 30°; specifically, the power of the servo motor 14 is set to 400W, the length of the mounting shaft 17 is 0.82 meters, and the sliding stroke of the driving block 13 driven by the electric screw 16 is 0.61 meters.

[0051] The embodiment of the present application also provides the application of the far-field laser to target parameter simulation device when the target is in a wind tunnel environment.

[0052] Reference Figure 3 As shown, the wind tunnel 18 is horizontally arranged, and a target model 19 is arranged therein, and the target model 19 is located on the central axis of the wind tunnel 18, and a light guide window 20 is opened on the side wall of the wind tunnel 18 at the height of the central axis, and the light guide window 20 corresponds to the position of the target model 19, then the far-field laser to target parameter simulation device is installed near the light guide window 20 and enables the laser beam to pass through the light guide window 20, and the target model is located at the target impact point of the light beam. In this embodiment, the spot adjustment system and the incident angle adjustment system are both arranged in a horizontal plane.

[0053] Specifically, the shortest distance between the fixing rod 8 and the side wall of the wind tunnel 18 is 1 meter. When the fixing rod 8 is installed, it is fixed on the ground at a certain angle α with the length direction of the wind tunnel 18. The angle is related to the incident angle variation range θ of the laser beam adjusted by the incident angle adjustment system, that is, α+θ=90°, and θ is 60° in this embodiment. Accordingly, α is 30° in this embodiment.

[0054] The wind tunnel 18 is also provided with a photoelectric detection module 21 and a contact temperature testing device 22, both of which are placed inside the target. The photoelectric detection module 21 measures the target breakdown time, and the contact temperature testing device 22 is used to collect temperature rise data.

[0055] A non-contact temperature testing device 23 and a camera 24 are arranged outside the wind tunnel 18 near the light guide window 20. The non-contact temperature testing device 23 uses an infrared thermal imager detector to record the temperature distribution of the target during irradiation, and the camera 24 records the target damage morphology in real time.

[0056] In other embodiments, the far-field laser-to-target parameter simulation device can also be applied to the simulation of far-field-to-target spot parameters in any variety of target environmental states such as ground static and mechanical loading, as well as a combination of various environmental states.

[0057] This embodiment also provides a method for simulating far-field to target laser parameters, which is performed using a device for simulating far-field to target laser parameters as described above, and includes the following steps:

[0058] The laser emission system emits a laser beam, and the laser 1 control software performs dynamic control of the output laser power;

[0059] The beam shaping device 3 shapes the laser beam to simulate the far-field spot morphology;

[0060] The beam size adjustment device 4 expands the shaped laser beam;

[0061] The beam jitter control device makes the laser beam after beam expansion jitter and then outputs it;

[0062] The incident angle adjustment system adjusts the incident angle of the jittered output laser beam reaching the target impact point.

[0063] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0064] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0065] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A device for simulating far-field to target laser parameters, characterized in that: include: Laser launch system; A spot adjustment system, which is used to adjust the spot shape and beam size of the laser beam emitted by the laser emission system and to control the laser beam jitter; An incident angle adjustment system, which is used to drive the light spot adjustment system to rotate around the laser irradiation point to adjust the incident angle of the laser beam output by the light spot adjustment system to reach the target impact point; The incident angle adjustment system includes a parallel multi-link mechanism and a driving mechanism, the driving mechanism controls the operation of the parallel multi-link mechanism, and the parallel multi-link mechanism controls the movement of the laser emission system and the spot adjustment system to adjust the incident angle of the laser beam reaching the target impact point; The parallel multi-link mechanism comprises an active rod (7), a fixed rod (8) and a driven rod (9), wherein one end of the active rod (7) away from the fixed rod (8) is connected to a long connecting rod (10), and one end of the driven rod (9) away from the long connecting rod (10) is connected to a short connecting rod (11); When the driving mechanism drives the active rod (7) to rotate, the long connecting rod (10) and the short connecting rod (11) are linked to cause the driven rod (9) to rotate with a point on its extension line as the center of the circle. During testing, the impact point of the far-field target is set at this point, so that the laser beam performs a rotational motion with the target as the center of the circle, thereby achieving the purpose of ensuring that the laser irradiation point remains unchanged while the incident angle of the light beam changes.

2. The device for simulating far-field to target laser parameters according to claim 1, characterized in that: The light spot adjustment system comprises a beam shaping device (3), a beam size adjustment device (4) and a beam jitter control device which are linearly arranged in sequence with the laser emission system; The beam shaping device (3) is used to shape the received laser beam; The beam size adjustment device (4) is used to expand the shaped laser beam; The beam jitter control device is used to control the jitter frequency of the expanded laser beam.

3. The device for simulating far-field to target laser parameters according to claim 2, characterized in that: The light beam jitter control device comprises: A reflecting mirror (5) used for reflecting the laser beam expanded by the beam size adjusting device (4); The fast reflection mirror (6) is used for receiving the laser beam reflected by the reflection mirror (5), and outputting the laser beam after shaking it at a set frequency.

4. The device for simulating far-field to target laser parameters according to claim 1, characterized in that: The incident angle adjustment system comprises: A parallel multi-link mechanism, comprising an active rod (7) and a driven rod (9), and a plurality of connecting rods connected between the active rod (7) and the driven rod (9), wherein the light spot adjustment system is fixed on the driven rod (9); A driving mechanism is used to drive the active rod (7) to move so that the driven rod (9) performs rotational movement around the laser irradiation point.

5. The device for simulating far-field to target laser parameters according to claim 4, characterized in that: The parallel multi-link mechanism also includes a fixed rod (8), the active rod (7) is hinged to the fixed rod (8), and the driving mechanism drives the active rod (7) to rotate around a connection point between the active rod (7) and the fixed rod (8).

6. The device for simulating far-field to target laser parameters according to claim 4, characterized in that: The laser beam output by the light spot adjustment system is parallel to the driven rod (9).

7. The device for simulating far-field to target laser parameters according to claim 1, characterized in that: The laser emitting system comprises a collimating head (2) for outputting a laser beam.

8. The device for simulating far-field to target laser parameters according to claim 4, characterized in that: The driving mechanism comprises a control computer (15) for controlling the rotation speed of the active rod (7).

9. A method for simulating far-field to target laser parameters, characterized in that: The method utilizes the device for simulating far-field to target laser parameters as claimed in claim 1, and comprises the following steps: The laser emission system emits the laser beam, and the laser control software dynamically controls the output laser power; The beam shaping device shapes the laser beam to simulate the far-field spot shape; The beam size adjustment device expands the shaped laser beam; The beam jitter control device makes the laser beam after beam expansion jitter and then outputs it; The incident angle adjustment system adjusts the incident angle of the jittered laser beam reaching the target impact point.

10. The method for simulating far-field to target laser parameters according to claim 9, characterized in that: The incident angle adjustment system causes the jittered laser beam to rotate around the laser irradiation point to adjust the incident angle of the laser beam reaching the target impact point.

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