Multi-channel space beam combination laser active lighting device

Abstract

The invention provides a multichannel space beam combination laser active lighting device. The multichannel space beam combination laser active lighting device comprises a collimation laser input system, a first reflecting mirror, a focusing secondary mirror assembly, a convergence assembly, a primary mirror assembly and a monitoring camera. The collimation laser input system comprises a multi-beam laser collimation assembly which is used for inputting multiple paths of laser beams to the first reflecting mirror; reflected light and transmitted light are respectively obtained after the multiple paths of laser beams are reflected and transmitted by the first reflecting mirror; the focusing secondary mirror assembly is arranged on the first side of the first reflecting mirror, and reflected light reflected by the first reflecting mirror is reflected to the primary mirror assembly through the focusing secondary mirror assembly so as to output a circular ring band; the convergence assembly is arranged on the second side of the first reflector. The transmission light transmitted by the first reflector is converged by the convergence assembly and then is emitted to the monitoring camera. According to the device, space beam combination is achieved through the cooperation, and the problem of light energy loss is avoided; the device is small in size and simple in heat dissipation; and closed-loop control can be realized.

Description

Technical Field

[0001] The present invention relates to the field of optical equipment, and more specifically, to a multi-channel spatial beam-combining laser active lighting device. Background Art

[0002] Common laser beam combining combines multiple beams of light into one beam of light, and then expands the beam, usually through an off-axis beam expansion system. Common problems of off-axis systems are complex structural processing and sensitivity to temperature changes. After temperature changes, thermal expansion and contraction of the structure and lenses can easily degrade the wave aberration of the off-axis system, resulting in poor output beam quality. The advantages of the common aperture beam expansion system are high imaging quality, simple structural processing, and high overall system stability. The disadvantage is that there is a gap in the center of the primary mirror, which will cause a partial loss of light when the normal light beam enters from the center of the system.

[0003] In addition, existing illumination lasers have the following defects: the higher the illumination laser power, the longer the effective distance, the better the illumination effect, but the larger the laser volume; high-power laser heat dissipation requires water cooling, and generally requires a water cooler, which makes the entire device too large and inconvenient to use; multi-beam spatial beam combining requires high accuracy, and cannot be accurately adjusted when a beam changes direction. Based on this, the present invention provides a multi-channel spatial beam combining laser active illumination device. Summary of the invention

[0004] The present invention aims at the technical problems existing in the prior art and provides a multi-channel spatial beam-combining laser active lighting device to solve the technical problems of avoiding light energy loss and the inability to accurately adjust the light path beam combination.

[0005] The technical solution provided by the present invention is as follows: A multi-channel spatial beam-combining laser active lighting device comprises: a collimated laser input system, a first reflector, a focusing secondary mirror assembly, a converging assembly, a primary mirror assembly and a monitoring camera; The collimated laser input system comprises a multi-beam laser collimation assembly, which is used to input a plurality of laser beams to the first reflector; after the plurality of laser beams are reflected and transmitted by the first reflector, reflected light and transmitted light are obtained respectively; The focusing secondary mirror assembly is arranged on the first side of the first reflector, the focusing secondary mirror assembly and the primary mirror assembly are a coaxial system, and the reflected light reflected by the first reflector is reflected to the primary mirror assembly through the focusing secondary mirror assembly to output a circular ring zone; The converging component is disposed on the second side of the first reflector, and the transmitted light transmitted by the first reflector is converged by the converging component and then emitted to the monitoring camera.

[0006] Based on the above technical solution, the present invention can also make the following improvements.

[0007] Optionally, the converging assembly includes a second reflector, a third reflector and a converging system; The second reflector, the third reflector and the focusing system are sequentially arranged between the first reflector and the monitoring camera along the optical path direction of the transmitted light; The transmitted light is emitted from the first reflector to the second reflector, reflected by the second reflector to the third reflector, then reflected by the third reflector to the focusing system, and then focused by the focusing system and emitted to the target surface of the monitoring camera.

[0008] Optionally, the focusing secondary mirror assembly includes a fourth reflecting mirror and a focusing secondary mirror; The fourth reflector and the focusing secondary mirror are sequentially arranged between the first reflector and the primary mirror assembly along the optical path direction of the reflected light; The reflected light is incident on the fourth reflecting mirror from the first reflecting mirror, is reflected by the fourth reflecting mirror to the secondary focusing mirror, and is further reflected by the secondary focusing mirror to the primary mirror assembly.

[0009] Optionally, when the observation distance or temperature changes, the focusing secondary mirror performs object distance compensation or temperature compensation by adjusting a potentiometer according to information on the change in the observation distance or temperature.

[0010] Optionally, the temperature compensation specifically includes: Calibrate the lighting device at different temperatures, adjust the focusing secondary mirror and record the potentiometer values ​​at different temperatures; The current ambient temperature is read, and the potentiometer is adjusted to a potentiometer value calibrated by the current ambient temperature, so as to adjust the focusing secondary mirror to a corresponding position.

[0011] Optionally, the object distance compensation specifically includes: Determining the position value of the focusing secondary mirror according to different observation distances, and converting the position value into a potentiometer value; The observation distance is read and the potentiometer value of the potentiometer is adjusted to adjust the focusing secondary mirror to a corresponding position.

[0012] Optionally, the multi-channel spatial beam-combining laser active lighting device further includes a control system; The control system is electrically connected to the monitoring camera and the laser alignment assembly; The control system is used to control the motor direction adjustment in the laser collimation assembly according to the light spot deviation in the monitoring camera to compensate for the deviation and form a closed light path loop.

[0013] Optionally, the laser alignment assembly is provided with two stepper motors, which are used to adjust the up and down and left and right axial positions of the laser in the prime laser alignment assembly respectively, and perform offset compensation so that the light emitted by the laser alignment assembly forms a closed optical path loop.

[0014] The present invention provides a multi-channel spatial beam-combining laser active lighting device by setting a collimated laser input system, a first reflector, a focusing secondary mirror assembly, a converging assembly, a main mirror assembly and a monitoring camera, wherein the collimated laser input system includes a multi-beam laser collimating assembly, which is used to input multiple laser light beams to the first reflector; the multiple laser light beams are reflected and transmitted by the first reflector to obtain reflected light and transmitted light respectively; the focusing secondary mirror assembly is arranged on the first side of the first reflector, and the reflected light reflected by the first reflector is reflected to the main mirror assembly through the focusing secondary mirror assembly to output a circular ring band; the converging assembly is arranged on the second side of the first reflector, and the transmitted light transmitted by the first reflector is converged by the converging assembly and then emitted to the monitoring camera.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The spatial beam combining is achieved by using the coordination of the direct laser input system, the first reflector, the focusing secondary mirror assembly, the converging assembly, the primary mirror assembly and the monitoring camera, thus avoiding the problem of light energy loss; (2) The device is small in size and does not require traditional water cooling, so the heat dissipation is simple; (3) The spatial combining accuracy of multiple beams can be precisely adjusted when the beam pointing changes, thus achieving closed-loop control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a multi-channel spatial beam-combining laser active illumination device provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a primary mirror assembly in a multi-channel spatial beam combining laser active illumination device provided by an embodiment of the present invention; Figure 3 A schematic diagram of a simulation of the lighting effect of a multi-channel spatial beam-combining laser active lighting device according to an embodiment of the present invention; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Collimated laser input system; 2. The first reflector; 3. Focusing secondary mirror assembly; 31. Fourth reflecting mirror; 32. Focusing secondary mirror; 4. Converging component; 41. Second reflector; 42. Third reflector; 43. Converging system; 5. Primary mirror assembly; 51. Circular annulus; 6. Surveillance cameras. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In addition, the technical features of the various embodiments or single embodiments provided by the present invention may be arbitrarily combined with each other to form a feasible technical solution. Such combination is not restricted by the sequence of steps and / or the structural composition pattern, but must be based on the ability of ordinary technicians in the field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] It should be noted that the terms “first”, “second”, “third” and “fourth” in the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance.

[0020] The embodiment of the present invention provides a multi-channel spatial beam combining laser active lighting device, such as Figure 1 As shown, the multi-channel spatial beam combining laser active lighting device includes: a collimated laser input system, a first reflector 2, a focusing secondary mirror assembly 3, a converging assembly 4, a primary mirror assembly 5 and a monitoring camera 6.

[0021] The collimated laser input system comprises a multi-beam laser collimation assembly, which is used to input multiple laser beams to the first reflector 2; after the multiple laser beams are reflected and transmitted by the first reflector 2, reflected light and transmitted light are obtained respectively.

[0022] The focusing secondary mirror assembly 3 is arranged on the first side of the first reflecting mirror 2 (such as Figure 1 As shown in the upper side, the reflected light reflected by the first reflector 2 is reflected by the focusing secondary mirror assembly 3 to the main mirror assembly 5 to output a circular ring band 51.

[0023] The focusing secondary mirror assembly 3 and the primary mirror assembly 5 are a coaxial system, and the laser diameter can be magnified at a fixed ratio after passing through the coaxial system.

[0024] The converging component 4 is arranged on the second side of the first reflector 2 (such as Figure 1 As shown in the lower side, the transmitted light transmitted by the first reflector 2 is converged by the converging component 4 and then emitted to the monitoring camera 6.

[0025] Specifically, Figure 1As shown, the laser emits parallel light after collimation, most of which is reflected by the first reflector 2, and a small part is transmitted. The reflected light is reflected by the fourth reflector 31 to the coaxial secondary mirror, as shown in FIG. Figure 2 As shown in FIG. 1 , the light is reflected by the focusing secondary mirror 32 to the surrounding of the primary mirror assembly 5 and finally output as a circular ring 51. Figure 3 shown.

[0026] Among them, the collimated laser input system includes a multi-beam laser collimation component, which can place multiple lasers at the same time and combine them into a high-power laser through space. Compared with a single high-power laser, it has a small size, simple heat dissipation (no water cooling is required), and is easy to use.

[0027] In a specific embodiment, Figure 1 As shown, the converging assembly 4 includes a second reflector 41 , a third reflector 42 and a converging system 43 .

[0028] The second reflector 41 , the third reflector 42 and the focusing system 43 are sequentially arranged between the first reflector 2 and the monitoring camera 6 along the optical path direction of the transmitted light.

[0029] The transmitted light is incident on the second reflector 41 from the first reflector 2 , reflected by the second reflector 41 to the third reflector 42 , further reflected by the third reflector 42 to the focusing system 43 , and then focused by the focusing system 43 and emitted to the target surface of the monitoring camera 6 .

[0030] like Figure 1 As shown, the focusing secondary mirror assembly 3 includes a fourth reflecting mirror 31 and a focusing secondary mirror 32 .

[0031] The fourth reflecting mirror 31 and the focusing secondary mirror 32 are sequentially arranged between the first reflecting mirror 2 and the primary mirror assembly 5 along the optical path direction of the reflected light.

[0032] The reflected light is incident on the fourth reflecting mirror 31 from the first reflecting mirror 2 , is reflected by the fourth reflecting mirror 31 to the focusing secondary mirror 32 , and is further reflected by the focusing secondary mirror 32 to the main mirror assembly 5 .

[0033] In an optional embodiment, when the observation distance or temperature changes, the focusing secondary mirror 32 performs object distance compensation or temperature compensation by adjusting the potentiometer according to the change information of the observation distance or temperature.

[0034] Among them, temperature compensation specifically includes: Calibrate the lighting device at different temperatures, adjust the focusing secondary mirror 32 and record the potentiometer values ​​at different temperatures; The current ambient temperature is read, and the potentiometer is adjusted to a potentiometer value calibrated by the current ambient temperature, so as to adjust the focusing secondary mirror 32 to a corresponding position.

[0035] Object distance compensation specifically includes: Determine the position value of the focusing secondary mirror 32 according to different observation distances, and convert the position value into a potentiometer value; The observation distance is read and the potentiometer value of the potentiometer is adjusted to adjust the focusing secondary mirror 32 to a corresponding position.

[0036] Furthermore, based on the above embodiment, the multi-channel spatial beam combining laser active lighting device also includes a control system; the control system is electrically connected to the monitoring camera 6 and the laser collimation component.

[0037] The control system is used to control the motor direction adjustment in the laser collimation assembly according to the light spot deviation in the monitoring camera 6 to compensate for the deviation and form a closed light path loop.

[0038] Specifically, the laser alignment assembly is provided with two stepper motors, which are used to adjust the upper and lower and left and right axial positions of the laser in the prime laser alignment assembly respectively, and perform offset compensation so that the light emitted by the laser alignment assembly forms a closed optical path loop.

[0039] In a specific example, the light emitted by the laser collimation assembly forms a closed optical path loop, specifically including: The angular resolution of the convergent light path is calculated by using the camera parameters of the monitoring camera 6 and the optical parameters of the convergent component 4, and the angle corresponding to the pixel in the camera image is obtained; The calibrated change in angle of the laser in the laser alignment assembly corresponding to each step of the stepper motor; The light beams emitted by the multi-beam laser collimation components are converged on the target surface of the monitoring camera 6 through the converging component 4 to obtain a circular light spot, and the coordinates of the center of mass position of the light spot are read.

[0040] In addition, before the multi-beam laser collimation assembly inputs the laser beam, it also includes: The laser collimation component is used for each laser to emit light separately, read the position of the center of mass of the light spot, calculate the coordinate difference with the theoretical position, determine the rotation direction and number of steps of the stepper motor according to the coordinate difference, and adjust the center of mass of the light spot to coincide with the theoretical position.

[0041] Compared with the prior art, the multi-channel spatial beam-combining laser active illumination device provided in this embodiment has the following beneficial effects: (1) The spatial beam combining is achieved by using the coordination of the direct laser input system, the first reflector, the focusing secondary mirror assembly, the converging assembly, the primary mirror assembly and the monitoring camera, thus avoiding the problem of light energy loss; (2) The device is small in size and does not require traditional water cooling, so the heat dissipation is simple; (3) The spatial combining accuracy of multiple beams can be precisely adjusted when the beam pointing changes, thus achieving closed-loop control.

[0042] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0043] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A multi-channel spatial beam combining laser active lighting device, characterized in that: include: A collimated laser input system, a first reflector, a focusing secondary mirror assembly, a converging assembly, a primary mirror assembly, and a monitoring camera; The collimated laser input system comprises a multi-beam laser collimation assembly, which is used to input a plurality of laser beams to the first reflector; after the plurality of laser beams are reflected and transmitted by the first reflector, reflected light and transmitted light are obtained respectively; The focusing secondary mirror assembly is arranged on the first side of the first reflector, the focusing secondary mirror assembly and the primary mirror assembly are a coaxial system, and the reflected light reflected by the first reflector is reflected to the primary mirror assembly through the focusing secondary mirror assembly to output a circular ring zone; The converging component is disposed on the second side of the first reflector, and the transmitted light transmitted by the first reflector is converged by the converging component and then emitted to the monitoring camera.

2. The multi-channel spatial beam combining laser active illumination device according to claim 1, characterized in that: The converging assembly includes a second reflector, a third reflector and a converging system; The second reflector, the third reflector and the focusing system are sequentially arranged between the first reflector and the monitoring camera along the optical path direction of the transmitted light; The transmitted light is emitted from the first reflector to the second reflector, reflected by the second reflector to the third reflector, then reflected by the third reflector to the focusing system, and then focused by the focusing system and emitted to the target surface of the monitoring camera.

3. The multi-channel spatial beam combining laser active illumination device according to claim 1, characterized in that: The focusing secondary mirror assembly comprises a fourth reflecting mirror and a focusing secondary mirror; The fourth reflector and the focusing secondary mirror are sequentially arranged between the first reflector and the primary mirror assembly along the optical path direction of the reflected light; The reflected light is incident on the fourth reflecting mirror from the first reflecting mirror, is reflected by the fourth reflecting mirror to the secondary focusing mirror, and is further reflected by the secondary focusing mirror to the primary mirror assembly.

4. The multi-channel spatial beam combining laser active illumination device according to claim 3, characterized in that: When the observation distance or temperature changes, the focusing secondary mirror performs object distance compensation or temperature compensation by adjusting the potentiometer according to the change information of the observation distance or temperature.

5. The multi-channel spatial beam combining laser active illumination device according to claim 4, characterized in that: The temperature compensation specifically includes: Calibrate the lighting device at different temperatures, adjust the focusing secondary mirror and record the potentiometer values ​​at different temperatures; The current ambient temperature is read, and the potentiometer is adjusted to a potentiometer value calibrated by the current ambient temperature, so as to adjust the focusing secondary mirror to a corresponding position.

6. The multi-channel spatial beam combining laser active illumination device according to claim 4, characterized in that: The object distance compensation specifically includes: Determining the position value of the focusing secondary mirror according to different observation distances, and converting the position value into a potentiometer value; The observation distance is read and the potentiometer value of the potentiometer is adjusted to adjust the focusing secondary mirror to a corresponding position.

7. The multi-channel spatial beam combining laser active illumination device according to claim 1, characterized in that: The multi-channel spatial beam-combining laser active lighting device also includes a control system; The control system is electrically connected to the monitoring camera and the laser alignment assembly; The control system is used to control the motor direction adjustment in the laser collimation assembly according to the light spot deviation in the monitoring camera to compensate for the deviation and form a closed light path loop.

8. The multi-channel spatial beam combining laser active illumination device according to claim 7, characterized in that: The laser alignment assembly is provided with two stepper motors, which are used to adjust the upper and lower and left and right axial positions of the laser in the prime laser alignment assembly respectively, and perform offset compensation so that the light emitted by the laser alignment assembly forms a closed optical path loop.

Images