Infrared laser composite photoelectric system dynamic aiming precision testing device and method

Abstract

The application discloses an infrared laser composite photoelectric system dynamic aiming precision testing device and method. The testing device is built by rotating a reflecting component, a beam splitter, a parallel light tube A, a round hole target, an infrared surface source blackbody, an attenuation sheet, a parallel light tube B and a laser spot receiver, and a dynamic simulation target source is composed of the infrared surface source blackbody, the round hole target, the parallel light tube A and the dynamic rotating reflecting component to guide a measured device to perform infrared tracking. After tracking is stabilized, laser emitted by the measured device is reflected to the parallel light tube B through the beam splitter, a laser spot is formed on the laser spot receiver at the focal plane position of the parallel light tube B, and dynamic laser aiming precision is tested by analyzing the spot shape. The method avoids interference of the laser spot on the guided target simulation source, removes the influence of a laser beam divergence angle on the dynamic aiming precision test result of the laser, and simultaneously measures and verifies tracking miss distance errors.

Description

Technical Field

[0001] This technology belongs to the field of testing technology, specifically relating to a testing device and method for the dynamic aiming accuracy of an infrared laser composite optoelectronic system. Background Technology

[0002] With the continuous improvement of optoelectronic technology, optoelectronic equipment is evolving from single-system to multi-system composite systems. Developing multi-system, multi-optical-axis optoelectronic measurement equipment has become a contemporary trend. When multi-optical-axis optoelectronic equipment simultaneously tracks and measures a target, the parallelism and consistency between the two optical axes are crucial for tracking and measurement, and are of great significance for improving the target tracking and attack capabilities of optoelectronic equipment. Infrared laser composite optoelectronic systems target fast-moving spatial targets by emitting lasers under infrared guidance to interfere with the target, achieving optoelectronic countermeasures. Therefore, the laser aiming performance under dynamic tracking is a key factor in evaluating this optoelectronic system and an important parameter for measuring the overall application performance of the infrared laser composite optoelectronic system.

[0003] A review of relevant literature revealed that most methods for measuring multi-axis aiming errors focus on testing the consistency of the optical axis of the infrared tracking system and the laser emission optical axis under static conditions. No literature was found on testing methods for infrared laser aiming errors under dynamic tracking conditions. Summary of the Invention

[0004] To test the dynamic aiming accuracy of infrared laser composite optoelectronic systems, this invention discloses a laboratory-based testing device and method for dynamic laser aiming accuracy, the specific scheme of which is as follows:

[0005] An infrared laser composite optoelectronic system dynamic aiming accuracy testing device includes a dynamic rotating reflection component 1, a beam splitter 2, a collimator A3, a circular aperture target 4, an infrared external source blackbody 5, an attenuator 6, a collimator B7, and a laser spot receiver 8; wherein, the circular aperture target 4 is set on the focal plane of the collimator A3, the attenuator 6 is set on the laser emission path reflected by the beam splitter 2, and the laser spot receiver 8 is set on the focal plane of the collimator B7;

[0006] The radiation emitted by the infrared external source blackbody 5 passes through the circular target 4, exits in parallel through the collimator A3, and then enters the rotating reflector 1 through the beam splitter 2. After being reflected by the two mirrors of the rotating reflector 1, it enters the infrared field of view of the device under test for capture and tracking. The laser emitted by the device under test is reflected by the rotating reflector 1 and the beam splitter 2, passes through the attenuator 6, and is focused into the laser spot receiver 8 through the collimator B7. The shape of the spot is analyzed to calculate the dynamic aiming accuracy of the infrared laser composite optoelectronic system.

[0007] The angle of the reflector of the rotating reflector component 1 is adjustable, and it can be controlled by a computer to rotate within the vertical platform according to the set rotation speed and rotation acceleration.

[0008] The beam splitter 2 is a semi-transparent and semi-reflective mirror, which can transmit through targets in the infrared tracking band of the device under test (3-5μm) and reflect emitted laser waves in the 3-5μm band.

[0009] The infrared blackbody is a temperature difference type infrared blackbody, and the temperature difference between the set temperature and the ambient temperature is set within the range of 10℃ to 20℃.

[0010] The diameter of the circular target 4 is selected to be 1 mrad relative to the focal length angle of the collimator A3.

[0011] The laser spot receiver 8 is a laser photosensitive target, an infrared thermal imager, or a beam analyzer.

[0012] The testing steps are as follows:

[0013] 1) Based on the requirements of the tracking angular velocity v and angular acceleration a of the device under test, and the rotation radius r of the rotating reflector 1, according to the formula... Calculate and set the reflector angle β, rotation speed v0, and distance L between the device under test and the center of the rotating reflector 1;

[0014] 2) Adjust the temperature of the infrared external source blackbody 5 for infrared tracking of the device under test;

[0015] 3) The rotating reflective component 1 remains stationary, with the rotation center located at the center of the field of view of the infrared tracker of the device under test, and the line connecting the two centers is perpendicular to the rotation plane, so that the star point of the circular target 4 enters the field of view of the infrared tracker of the device under test.

[0016] 4) Fine-tune the collimator A3 so that the star point of the circular target 4 is at the center of the two mirrors of the rotating reflector assembly 1.

[0017] 5) Rotate the rotating reflector 1 one revolution to ensure that the device under test can stably track the star point of the circular target 4);

[0018] 6) Adjust the position of beam splitter 2 so that the star point of the circular target 4 is at the center of beam splitter 2;

[0019] 7) Control the device under test to emit a laser once at different rotation positions of the rotating reflector 1 to ensure that the laser spot receiver 8 can receive the laser signal;

[0020] 8) Adjust the laser emission power of the device under test to meet the test requirements;

[0021] 9) Fire a laser once, record and measure the diameter d of the laser spot on the laser spot receiver;

[0022] 10) After the device under test enters a stable tracking state, control the device under test to continuously emit laser light, and the sampling period of the laser spot receiver 8 shall not be less than twice the motion period of the rotating reflector 1.

[0023] 11) According to the dynamic laser aiming accuracy The formula analyzes the laser spot calculation test results, where D is the maximum diameter of the laser spot recorded on the laser spot receiver 8 after the test, and f is the focal length of the collimator B7.

[0024] The beneficial effect of this invention is that it provides a test method for the dynamic aiming accuracy of an infrared laser composite optoelectronic system. This method takes into account the influence of the laser beam divergence angle on the test results, avoids the interference of the laser spot on the guided target simulation source, and measures the dynamic tracking accuracy to verify the tracking miss error. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the composition and layout of the dynamic aiming accuracy testing device in this invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] ① Rotating reflector assembly; ② Beam splitter; ③ Collimator A; ④ Circular aperture target; ⑤ Infrared external source blackbody; ⑥ Attenuator; ⑦ Collimator B; ⑧ Laser spot receiver.

[0028] Figure 2 This is a schematic diagram of the laser spot used for dynamic aiming accuracy testing in this invention. Detailed Implementation

[0029] Preferred embodiments of the present invention are described below in conjunction with the accompanying drawings:

[0030] See Figure 1 The infrared laser composite optoelectronic system dynamic aiming accuracy testing device includes a dynamic rotating reflection component 1, a beam splitter 2, a collimator A3, a circular aperture target 4, an infrared external source blackbody 5, an attenuator 6, a collimator B 7, and a laser spot receiver 8; wherein, the circular aperture target 4 is located on the focal plane of the collimator A3, and the laser spot receiver 8 is located on the focal plane of the collimator B 7.

[0031] The radiation emitted by the infrared external source blackbody 5 passes through the circular target 4, exits parallel through the collimator A3, and enters the rotating reflector 1 through the beam splitter 2. After being reflected by the two mirrors of the rotating reflector 1, it enters the infrared field of view of the device under test for capture and tracking. The laser emitted by the device under test is reflected by the rotating reflector 1 and the beam splitter 2, passes through the attenuator 6, and is focused into the laser spot receiver 8 through the collimator B7. The shape of the spot is analyzed to calculate the dynamic aiming accuracy of the infrared laser composite optoelectronic system.

[0032] In the above-mentioned dynamic aiming accuracy testing device:

[0033] The reflector angle of the rotating reflector assembly 1 is adjustable, and it can be controlled by a computer to rotate within the vertical platform according to the set rotation speed and acceleration.

[0034] Beam splitter 2 is a semi-transparent, semi-reflective mirror that can transmit light to infrared tracking targets in the 3–5 μm range of the device under test.

[0035] It can reflect the emitted laser wavelength in the 3-5μm range;

[0036] The infrared external source blackbody 5 is a temperature difference type infrared blackbody, and the temperature difference between the set temperature and the ambient temperature is set within the range of 10℃~20℃;

[0037] The diameter of the circular aperture target 4 is selected to have an angle of 1 mrad relative to the focal length of the collimator A3;

[0038] The laser spot receiver 8 can be a laser photosensitive target, an infrared thermal imager, or a beam analyzer;

[0039] The following section uses an infrared laser composite optoelectronic system as an example to detail the test method for its dynamic aiming accuracy.

[0040] The testing method provided by this invention includes the following steps:

[0041] 1) By Figure 1 The layout and device connections are shown below;

[0042] 2) Adjust the position and orientation of the device under test so that the central optical axis of the infrared field of view of the device under test is parallel to the optical axis of the collimator A3;

[0043] 3) According to the requirements of the tracking angular velocity v and angular acceleration a of the device under test, follow the formula. Calculate and set the reflector angle β, rotation speed v0, and distance L between the device under test and the center of the rotating reflector 1;

[0044] 2) Adjust the temperature of the infrared external source blackbody 5 to meet the tracking requirements of the device under test;

[0045] 3) The rotating reflective component 1 remains stationary, with the rotation center located at the center of the field of view of the infrared tracker of the device under test, and the line connecting the two centers is perpendicular to the rotation plane, so that the star point of the circular target 4 enters the field of view of the infrared tracker of the device under test.

[0046] 4) Fine-tune the collimator A3 so that the star point of the circular target 4 is at the center of the two mirrors of the rotating reflector assembly 1.

[0047] 5) Rotate the reflective component 1 one revolution to ensure that the device under test can stably track the star point of the circular target 4;

[0048] 6) Adjust the position of beam splitter 2 so that the star point of the circular target 4 is at the center of beam splitter 2;

[0049] 7) Control the device under test to emit a laser once at different rotation positions of the rotating reflector 1 to ensure that the laser spot receiver 8 can receive the laser signal;

[0050] 8) Adjust the laser emission power of the device under test for infrared tracking;

[0051] 9) Emit a laser once, record and measure the diameter d of the laser spot on the laser spot receiver 8;

[0052] 10) After the device under test enters a stable tracking state, control the device under test to continuously emit laser light, and the sampling period of the laser spot receiver 8 shall not be less than twice the motion period of the rotating reflector (1);

[0053] 11) According to the dynamic laser aiming accuracy Formula analysis calculates the test results of the laser spot shape, where D is the maximum diameter of the laser spot recorded on the laser spot receiver 8 after the test, and f is the focal length of the collimator B7. See the schematic diagram of the laser spot. Figure 2 .

Claims

1. A method for testing the dynamic aiming accuracy of an infrared laser composite optoelectronic system, wherein the testing device includes a rotating reflector (1), a beam splitter (2), a collimator A (3), a circular aperture target (4), an infrared external source blackbody (5), an attenuator (6), a collimator B (7), and a laser spot receiver (8); the circular aperture target (4) is placed on the focal plane of the collimator A (3), and the laser spot receiver (8) is placed on the focal plane of the collimator B (7); the beam splitter (2) is a 3~5μm semi-transparent and semi-reflective mirror that transmits infrared tracking band and reflects lasers of the same band; The radiation emitted by the infrared external source blackbody (5) passes through the circular target (4), exits in parallel through the collimator A (3), and enters the rotating reflector (1) through the beam splitter (2). After being reflected by the two mirrors of the rotating reflector (1), it enters the infrared field of view of the device under test for capture and tracking. The laser emitted by the device under test is reflected by the rotating reflector (1) and the beam splitter (2), passes through the attenuator (6), and converges into the laser spot receiver (8) through the collimator B (7). The shape of the spot is analyzed to calculate the dynamic aiming accuracy of the infrared laser composite optoelectronic system. The method includes the following steps: 1) Based on the requirements of the tracking angular velocity v and angular acceleration a of the device under test, and the rotation radius r of the rotating reflector (1), according to the formula Calculate and set the reflector angle β, rotation speed v0, and distance L between the device under test and the center of the rotating reflector (1) of the rotating reflector assembly (1); 2) Adjust the temperature of the infrared external source blackbody (5) for infrared tracking of the device under test; 3) The rotating reflective component (1) remains stationary, the rotation center is located at the center of the field of view of the infrared tracker of the device under test, and the line connecting the two centers is perpendicular to the rotation plane, so that the star point of the circular hole target (4) enters the field of view of the infrared tracker of the device under test. 4) Finely adjust the collimator A (3) so that the star point of the circular target (4) is at the center of the two mirrors of the rotating reflector assembly (1); 5) Rotate the reflective component (1) one revolution to ensure that the device under test can stably track the star point of the circular target (4); 6) Adjust the position of the beam splitter (2) so that the star point of the circular target (4) is at the center of the beam splitter (2); 7) Control the device under test to emit a laser once at different rotation positions of the rotating reflector (1) to ensure that the laser spot receiver (8) can receive the laser signal; 8) Adjust the laser emission power of the device under test, record and measure the diameter d of a single laser spot; 9) After the device under test enters a stable tracking state, control the device under test to continuously emit laser light. The sampling period of the laser spot receiver (8) is not less than twice the motion period of the rotating reflector (1). 10) According to the dynamic laser aiming accuracy The formula analyzes the laser spot calculation test results, where D is the maximum diameter of the laser spot recorded on the laser spot receiver (8) after the test, and f is the focal length of the collimator B (7).

2. The method according to claim 1, characterized in that: The reflector angle of the rotating reflector assembly (1) is adjustable, and it rotates within the vertical platform according to the set rotation speed and acceleration by controlling the computer.

3. The method according to claim 1, characterized in that: The laser spot receiver (8) is a laser photosensitive target paper, an infrared thermal imager, or a beam analyzer.

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