A dynamic irradiation precision in-field test system and method for a laser emission system

Abstract

The application provides a dynamic irradiation precision field test system and method for a laser emission system. The system comprises a ring-shaped slide rail, a lifting platform, an optical faceplate, a sampling light path and a test light path connected with each other. The system can realize fast and efficient measurement of the dynamic irradiation precision of the laser under the field condition by adopting the combination of the moving target simulation and the real-time optical axis detection, and has the advantages of wide applicable waveband range and high test precision.

Description

Technical Field

[0001] This invention belongs to the field of optoelectronic system testing technology, specifically relating to an indoor testing system and method for dynamic irradiation accuracy of a laser emission system. Background Technology

[0002] In fields such as laser communication, laser ranging, and laser illumination, it is often necessary to simultaneously track a moving target and accurately illuminate a specific location on the target's surface with a laser beam. Due to factors such as vibration, delay, and steady-state errors caused during dynamic tracking, the dynamic illumination accuracy of a laser emission system for moving targets is worse than its static illumination accuracy for stationary targets. Therefore, to accurately assess whether the performance of a laser emission system meets the requirements, dynamic illumination accuracy testing is necessary. The challenge of conducting laser dynamic illumination accuracy testing under indoor conditions lies in simultaneously meeting two conditions: first, simulating a moving target so that the system under test can detect and continuously track it, thereby continuously illuminating the target with a laser; and second, receiving the laser spot illuminating the target and measuring the deviation of the optical axis relative to a reference position. Traditional indoor testing methods typically use rotating targets or turntables to simulate moving targets and test tracking accuracy, or use collimators in fixed positions to test laser optical axis deviation under static conditions. There is no testing system or method that can simultaneously meet both conditions and achieve laser dynamic irradiation accuracy. Furthermore, testing dynamic tracking accuracy and static optical axis deviation separately cannot accurately reflect the laser emitting system's optical axis accuracy control capability during continuous tracking and light emission irradiation. Therefore, traditional indoor testing systems and methods cannot meet the requirements for laser dynamic irradiation accuracy testing. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides an indoor testing system for the dynamic illumination accuracy of a laser emission system. It includes a connected annular slide rail, a lifting platform, an optical breadboard, a sampling optical path, and a testing optical path. Employing a combination of moving target simulation and real-time optical axis detection, it enables rapid and efficient measurement of laser dynamic illumination accuracy under indoor conditions, and possesses the advantages of a wide applicable wavelength range and high testing accuracy.

[0004] An indoor testing system for dynamic irradiation accuracy of a laser emission system is characterized by comprising a connected annular slide rail 1, a lifting platform 2, and an optical breadboard 3, as well as a sampling optical path and a testing optical path. The annular slide rail 1 is set on a flat and stable ground in the indoor field. The lower surface of the lifting platform 2 is connected to the motion mechanism of the annular slide rail 1, and the upper surface is connected to the optical breadboard 3. The sampling optical path and the testing optical path are arranged on the optical breadboard 3. The lifting platform 2, the optical breadboard 3, the sampling optical path, and the testing optical path can move as a whole along the annular slide rail track through the motion mechanism. The sampling optical path includes wedge mirror 1 4, wedge mirror 2 5, convex lens 6, laser power meter 7, and laser cutoff plate 8. Wedge mirror 1 4 and wedge mirror 2 5 can achieve optical docking between the optical path of the system under test and the test optical path through reflection from their front surfaces. The test optical path includes an off-axis collimator, a beam splitter 11, a target plate 12, a composite light source 13, an attenuator 14, and a laser spot detector 15. The off-axis collimator includes a primary mirror 9 and a secondary mirror 10, arranged on the front surface of the wedge mirror 5 in the sampling optical path, emitting in the direction of emission. The beam splitter 11 is arranged between the focal plane of the off-axis collimator's focusing optical path and the secondary mirror 10. The target plate 12 and the composite light source 13 are sequentially arranged on the focusing optical path of the off-axis collimator after reflection by the beam splitter, with the target plate 12 positioned on the focal plane. A crosshair is engraved on the surface of the target plate 12, with a small hole at the center of the crosshair. The attenuator 14 and the laser spot detector 15 are sequentially arranged on the focusing optical path of the off-axis collimator after transmission through the beam splitter. The optical paths of the target plate 12 and the composite light source 13 are combined with the optical paths of the attenuator 14 and the laser spot detector 15 through the beam splitter. After beam combining, the center of the crosshair on the target plate 12 overlaps with the center of the laser spot detector 15.

[0005] Furthermore, the circular slide rail 1 is a high-precision, high-load-bearing electric circular slide rail, with an effective load matching the total weight of the lifting platform 2, optical breadboard 3, sampling optical path, and test optical path, and the angle range of the slide rail motion mechanism moving continuously along the track matching the azimuth axis scanning range of the system under test 16.

[0006] Furthermore, the lifting platform 2 is a high-precision, high-load-bearing, electrically adjustable lifting platform with an effective load matching the total weight of the optical breadboard 3, the sampling optical path, and the test optical path, and a height adjustment range matching the optical height of the system under test 16.

[0007] Furthermore, the optical breadboard 3 is a standard high-flatness optical breadboard, and the table size matches the arrangement area of ​​the sampling optical path and the test optical path.

[0008] Furthermore, in the sampling optical path, the apertures of wedge mirror 4 and wedge mirror 5 match the total optical aperture of the optical path of the system under test, and both are coated with a beam-splitting film. This ensures efficient reflection of the tracking and detection band and efficient transmission of the laser band for the system under test. The laser damage resistance power density threshold of the beam-splitting film matches the laser power density incident on the film surface. Convex lens 6 and laser power meter 7 are arranged sequentially in the direction in which the laser of the system under test 16 is transmitted through wedge mirror 1. The aperture of convex lens 6 matches the laser beam aperture of the system under test 16, and the distance between convex lens 6 and laser power meter can be adjusted so that the transmitted laser beam can be fully received by laser power meter 7 after convergence. Laser cutoff plate 8 is arranged in the direction in which the laser is transmitted through wedge mirror 2. The effective aperture of laser cutoff plate 8 matches the laser beam aperture, and the laser damage resistance power density threshold of laser cutoff plate matches the laser power density incident on laser cutoff plate.

[0009] Furthermore, in the aforementioned test optical path, both the primary mirror 9 and the secondary mirror 10 are coated with a full-band high-efficiency reflective film, and the aperture of the primary mirror 9 matches the aperture of the wedge mirror 5; the beam splitter 11 is arranged at an appropriate position between the focal plane of the off-axis collimator focusing optical path and the secondary mirror, and the aperture of the beam splitter 11 matches the aperture of this position on the focusing optical path, and it provides high-efficiency reflection in the detection band and high-efficiency transmission in the laser band of the system under test; the composite light source 13 is a radiator combining a surface blackbody and an LED lamp, and its radiation band covers the visible light to long-wave infrared; the magnification of the attenuator 14 matches the laser power incident on the attenuator, and the laser spot detector 15 is arranged on the focal plane. The present invention also provides a test method using the dynamic irradiation accuracy indoor test system of the laser emission system as described above, characterized by the following steps: (1) Set the system under test near the center of the circular slide rail, with the azimuth axis scanning rotation center of the optical path of the system under test coinciding with the center of the circular slide rail, and the pitch axis of the optical path remaining horizontal. (2) Control the circular slide rail motion mechanism to move to the position of the optical path of the system under test, and adjust the lifting platform to make the optical height of the sampling optical path and the test optical path consistent with the optical height of the optical path of the system under test; (3) Start the composite light source. The radiation light generated by the light source passes through the small hole of the target plate to form a point target light source. The beam of the point target light source passes through the beam splitter, secondary mirror, primary mirror, wedge mirror 2, and wedge mirror 1 in sequence and then enters the optical path of the system under test. (4) Start the system under test, control the system to capture the point target, and switch to continuous tracking state; (5) Control the system under test to emit laser. The laser beam passes through wedge mirror one, wedge mirror two, primary mirror, secondary mirror, beam splitter and attenuator in sequence and is received by laser spot detector. At the same time, laser power meter receives and records the transmitted laser of wedge mirror one, and laser cut-off plate cuts off the transmitted laser of wedge mirror two. (6) Control the motion mechanism of the ring slide rail to make circular motion or reciprocating motion relative to the center of the circle at a certain angular velocity. At this time, the system under test also begins to rotate accordingly because it is in the tracking state. Use a laser spot detector to measure and record the laser spot image during this process. (7) Use the centroid algorithm to calculate the number of pixels whose laser spot energy centroid position deviates from the detector center in each frame of the image, and then multiply the number of deviated pixels by the single pixel angular resolution of the detector. (8) After the test, first control the circular slide rail motion mechanism to gradually stop moving, then control the system under test to stop emitting light and release the tracking state, and then turn off the system under test, composite light source, laser spot detector and circular slide rail actuator.

[0010] The beneficial effects of this invention are: by combining moving target simulation and real-time optical axis detection, it is possible to quickly and efficiently measure the accuracy of laser dynamic irradiation under indoor conditions, and it has the advantages of a wide applicable wavelength range and high testing accuracy. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; In the figure, 1-circular slide rail, 2-lifting platform, 3-optical breadboard, 4-wedge mirror one, 5-wedge mirror two, 6-convex lens, 7-laser power meter, 8-laser cutoff plate, 9-primary mirror, 10-secondary mirror, 11-beam splitter, 12-target plate, 13-composite light source, 14-attenuator, 15-laser spot detector, 16-system under test. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments. The present invention includes, but is not limited to, the following embodiments.

[0013] like Figure 1 As shown, the present invention provides an indoor testing system for dynamic irradiation accuracy of a laser emission system, including a connected annular slide rail 1, a lifting platform 2, and an optical breadboard 3, as well as a sampling optical path and a testing optical path. The annular slide rail 1 is set on a flat and stable ground in the indoor field. The lower surface of the lifting platform 2 is connected to the motion mechanism of the annular slide rail 1, and the upper surface is connected to the optical breadboard 3. The sampling optical path and the testing optical path are arranged on the optical breadboard 3. The lifting platform 2, the optical breadboard 3, the sampling optical path, and the testing optical path can move as a whole along the track of the annular slide rail 1 through the motion mechanism.

[0014] Furthermore, the annular slide rail 1 is configured as a high-precision, high-load-bearing electric annular slide rail, with an effective load matching the total weight of the lifting platform 2, optical breadboard 3, sampling optical path, and test optical path, and the angle range of the slide rail motion mechanism moving continuously along the track matching the azimuth axis scanning range of the system under test 16.

[0015] Furthermore, the lifting platform 2 is a high-precision, high-load-bearing, electrically adjustable lifting platform with an effective load matching the total weight of the optical breadboard 3, the sampling optical path, and the test optical path, and a height adjustment range matching the optical height of the system under test 16.

[0016] Furthermore, the optical breadboard 3 is a standard high-flatness optical breadboard, and the table size matches the arrangement area of ​​the sampling optical path and the test optical path.

[0017] Furthermore, the sampling optical path includes wedge mirror 4, wedge mirror 5, convex lens 6, laser power meter 7, and laser cutoff plate 8. Wedge mirror 4 and wedge mirror 5 can achieve optical docking between the optical path of the system under test and the test optical path through reflection from their front surfaces.

[0018] Furthermore, the apertures of wedge mirror 1 4 and wedge mirror 2 5 are matched with the total optical aperture of the optical path of the system under test, and both are coated with a beam-splitting film, which efficiently reflects the tracking and detection band of the system under test 16 and efficiently transmits the laser band. The laser damage resistance power density threshold of the film is matched with the laser power density incident on the surface of the film.

[0019] The convex lens 6 and the laser power meter 7 are arranged sequentially in the direction in which the laser beam of the system under test 16 is transmitted through the wedge mirror 4. The aperture of the convex lens 6 matches the aperture of the laser beam of the system under test 16, and the distance between the convex lens 6 and the laser power meter 7 can be adjusted so that the transmitted laser beam can be fully received by the laser power meter 7 after being converged and contracted.

[0020] The laser cutoff plate 8 is arranged in the direction in which the laser is transmitted through the wedge mirror 2 5. The effective aperture of the laser cutoff plate 8 matches the laser beam aperture, and the laser damage resistance power density threshold of the laser cutoff plate 8 matches the laser power density incident on the laser cutoff plate.

[0021] Furthermore, the test optical path includes an off-axis collimator, a beam splitter 11, a target plate 12, a composite light source 13, an attenuator 14, and a laser spot detector 15.

[0022] The off-axis collimator includes a primary mirror 9 and a secondary mirror 10, which are arranged on the front surface of the second wedge mirror 5 in the emission direction. Both the primary mirror 9 and the secondary mirror 10 are coated with a full-band high-efficiency reflective film, and the light transmission aperture of the primary mirror 9 is matched with the light transmission aperture of the second wedge mirror 5.

[0023] The beam splitter 11 is positioned at an appropriate location between the focal plane of the focusing optical path of the off-axis collimator and the secondary mirror 10. The aperture of the beam splitter 11 matches the aperture of the focusing optical path at this location, and it provides efficient reflection in the detection band and efficient transmission in the laser band of the system under test 16.

[0024] The target plate 12 and the composite light source 13 are arranged sequentially on the focused light path after the off-axis parallel light tube is reflected by the beam splitter 11. The target plate 12 is arranged on the focal plane. The surface of the target plate 12 is engraved with cross lines, and a small hole is provided in the center of the cross lines. The composite light source 13 is set as a radiator that combines a surface source blackbody and an LED lamp, and the radiation band covers the visible light to long-wave infrared.

[0025] The attenuator 14 and the laser spot detector 15 are arranged sequentially on the focused optical path after the off-axis collimator is transmitted through the beam splitter 11. The magnification of the attenuator 14 is matched with the laser power incident on the attenuator, and the laser spot detector 15 is arranged on the focal plane.

[0026] The optical paths of the target plate 12, the composite light source 13, the attenuator 14, and the laser spot detector 15 are combined by the beam splitter 11. After beam combining, the center of the crosshair of the target plate 12 overlaps with the center of the laser spot detector 15.

[0027] In addition, the present invention also relates to an indoor field testing method for the dynamic irradiation accuracy of a laser emission system, specifically including the following steps: (1) Set the system under test 16 near the center of the circular slide rail 1. The optical path azimuth axis scanning rotation center of the system under test 16 coincides with the center of the circular slide rail 1, and the optical path pitch axis is always parallel to the horizontal direction. (2) Control the movement mechanism of the ring slide rail 1 to move to the position of the optical path of the system under test 16, adjust the lifting platform 2 to make the height of the sampling optical path and the test optical path consistent with the height of the optical path of the system under test 16, so as to realize the optical docking between the optical paths; (3) Start the composite light source 13. The radiation light generated by the light source passes through the small hole of the target plate 12 to form a point target light source. The beam of the point target light source passes through the beam splitter 11, secondary mirror 10, primary mirror 9, wedge mirror 2 5, and wedge mirror 1 4 in sequence and then enters the optical path of the system under test 16. (4) Start the system under test 16, control the system to capture the point target, and switch to continuous tracking state; (5) Control the system under test 16 to emit laser. The laser beam passes through wedge mirror 1 4, wedge mirror 2 5, main mirror 9, secondary mirror 10, beam splitter 11 and attenuator 14 in sequence and is received by laser spot detector 15. At the same time, laser power meter 7 receives and records the transmitted laser of wedge mirror 1 4, and laser cut-off plate 8 cuts off the transmitted laser of wedge mirror 2 5. (6) Control the motion mechanism of the ring slide rail 1 to make circular motion or reciprocating motion relative to the center of the circle at a certain angular velocity. At this time, the system under test 16 also starts to rotate accordingly because it is in the tracking state. Use the laser spot detector 15 to measure and record the laser spot image during this process. (7) Calculate the number of pixels whose laser spot energy centroid position deviates from the detector center in each frame image using the centroid algorithm. Then multiply the number of deviated pixels by the single pixel angular resolution of the detector to obtain the dynamic illumination accuracy of the laser at the corresponding moment in each frame. Further statistical calculations can be performed as needed. (8) After the test is completed, first control the motion mechanism of the ring slide rail 1 to gradually stop moving, then control the system under test 16 to stop emitting light and release the tracking state, and then turn off the system under test 16, the composite light source 13, the laser spot detector 15 and the actuator of the ring slide rail 1.

[0028] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A dynamic irradiation accuracy in-field test system for a laser emission system, characterized in that: The system includes a connected annular slide rail (1), a lifting platform (2), and an optical breadboard (3), as well as a sampling optical path and a testing optical path. The annular slide rail (1) is set on a flat and stable ground in the inner field. The lower surface of the lifting platform (2) is connected to the motion mechanism of the annular slide rail (1), and the upper surface is connected to the optical breadboard (3). The sampling optical path and the testing optical path are arranged on the optical breadboard (3). The lifting platform (2), the optical breadboard (3), the sampling optical path, and the testing optical path can move as a whole along the annular slide rail track through the motion mechanism. The sampling optical path includes wedge mirror one (4), wedge mirror two (5), convex lens (6), laser power meter (7), and laser cutoff plate (8). Wedge mirror one (4) and wedge mirror two (5) can achieve optical docking between the optical path of the system under test and the test optical path through reflection from their front surfaces. The test optical path includes an off-axis collimator, a beam splitter (11), a target plate (12), a composite light source (13), an attenuator (14), and a laser spot detector (15). The off-axis collimator includes a primary mirror (9) and a secondary mirror (10), arranged on the front surface of the second wedge mirror (5) in the sampling optical path, emitting in the direction of emission. The beam splitter (11) is arranged between the focal plane of the off-axis collimator's focusing optical path and the secondary mirror (10). The target plate (12) and the composite light source (13) are sequentially arranged on the focal plane of the off-axis collimator after reflection by the beam splitter. On the focal plane, the target plate (12) is arranged on the focal plane. The surface of the target plate (12) is engraved with cross lines, and a small hole is provided in the center of the cross lines. The attenuator (14) and the laser spot detector (15) are arranged in sequence on the focusing optical path after the off-axis parallel light tube is transmitted through the beam splitter. The optical paths of the target plate (12) and the composite light source (13) are combined with the optical paths of the attenuator (14) and the laser spot detector (15) through the beam splitter. After the beam is combined, the center of the cross lines of the target plate (12) overlaps with the center of the laser spot detector (15).

2. The dynamic irradiation precision in-field test system for a laser emission system according to claim 1, characterized in that: The circular slide rail (1) is a high-precision, high-load-bearing electric circular slide rail. The effective load matches the total weight of the lifting platform (2), optical breadboard (3), sampling optical path and test optical path. The angle range of the slide rail motion mechanism moving continuously along the track matches the azimuth axis scanning range of the system under test (16).

3. The dynamic irradiation accuracy in-field test system for a laser emission system according to claim 1, characterized in that: The lifting platform (2) is a high-precision, high-load-bearing, electrically adjustable lifting platform. Its effective load matches the total weight of the optical breadboard (3), the sampling optical path, and the test optical path. Its height adjustment range matches the optical height of the system under test (16).

4. The dynamic irradiation accuracy in-field test system for a laser emission system of claim 1, wherein: The optical breadboard (3) is a standard high-flatness optical breadboard with a table size that matches the area of ​​the sampling optical path and the test optical path.

5. The dynamic irradiation accuracy in-field test system for a laser emission system of claim 1, wherein: In the sampling optical path, the apertures of wedge mirror 1 (4) and wedge mirror 2 (5) match the total optical aperture of the optical path of the system under test, and both are coated with a beam splitting film. The system under test has efficient reflection of the tracking and detection band and efficient transmission of the laser band. The laser damage resistance power density threshold of the beam splitting film matches the laser power density incident on the film surface. The convex lens (6) and the laser power meter (7) are arranged in sequence in the direction of the laser of the system under test (16) transmitted through the wedge mirror 1. The aperture of the convex lens (6) matches the laser beam aperture of the system under test (16), and the distance between the convex lens (6) and the laser power meter can be adjusted so that the transmitted laser beam can be fully received by the laser power meter (7) after convergence. The laser cutoff plate (8) is arranged in the direction of the laser transmitted through the wedge mirror 2. The effective aperture of the laser cutoff plate (8) matches the laser beam aperture, and the laser damage resistance power density threshold of the laser cutoff plate matches the laser power density incident on the laser cutoff plate.

6. The indoor field testing system for dynamic irradiation accuracy of a laser emission system as described in claim 1, characterized in that: In the test optical path, the primary mirror (9) and the secondary mirror (10) are coated with a full-band high-efficiency reflective film, and the aperture of the primary mirror (9) is matched with the aperture of the wedge mirror (5); the beam splitter (11) is arranged at an appropriate position between the focal plane of the off-axis collimator focusing optical path and the secondary mirror (10), and the aperture of the beam splitter (11) is matched with the aperture of this position on the focusing optical path, and it has high-efficiency reflection of the detection band and high-efficiency transmission of the laser band of the system under test; the composite light source (13) is a radiator that combines a surface source blackbody and an LED lamp, and the radiation band covers the visible light to long-wave infrared; the magnification of the attenuator (14) is matched with the laser power incident on the attenuator, and the laser spot detector (15) is arranged on the focal plane.

7. A test method using an indoor field test system for dynamic irradiation accuracy of a laser emission system as described in any one of claims 1-6, characterized in that... The steps are as follows: (1) Set the system under test near the center of the circular slide rail, with the azimuth axis scanning rotation center of the optical path of the system under test coinciding with the center of the circular slide rail, and the pitch axis of the optical path remaining horizontal. (2) Control the circular slide rail motion mechanism to move to the position of the optical path of the system under test, and adjust the lifting platform to make the optical height of the sampling optical path and the test optical path consistent with the optical height of the optical path of the system under test; (3) Start the composite light source. The radiation light generated by the light source passes through the small hole of the target plate to form a point target light source. The beam of the point target light source passes through the beam splitter, secondary mirror, primary mirror, wedge mirror 2, and wedge mirror 1 in sequence and then enters the optical path of the system under test. (4) Start the system under test, control the system to capture the point target, and switch to continuous tracking state; (5) Control the system under test to emit laser. The laser beam passes through wedge mirror one, wedge mirror two, primary mirror, secondary mirror, beam splitter and attenuator in sequence and is received by laser spot detector. At the same time, laser power meter receives and records the transmitted laser of wedge mirror one, and laser cut-off plate cuts off the transmitted laser of wedge mirror two. (6) Control the motion mechanism of the ring slide rail to make circular motion or reciprocating motion relative to the center of the circle at a certain angular velocity. At this time, the system under test also begins to rotate accordingly because it is in the tracking state. Use a laser spot detector to measure and record the laser spot image during this process. (7) Use the centroid algorithm to calculate the number of pixels whose laser spot energy centroid position deviates from the detector center in each frame of the image, and then multiply the number of deviated pixels by the single pixel angular resolution of the detector. (8) After the test, first control the circular slide rail motion mechanism to gradually stop moving, then control the system under test to stop emitting light and release the tracking state, and then turn off the system under test, composite light source, laser spot detector and circular slide rail actuator.

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