A measurement system and method for optical antenna emission angle

Abstract

The present invention discloses a system and method for measuring the emission angle of an optical antenna. The system includes a laser emitting device, a photoelectric conversion device, a data acquisition and processing device, a horizontal inclinometer, and an equipment bracket. The receiving end of the optical antenna is sequentially connected to the photoelectric conversion device and the data acquisition and processing device. The equipment bracket is mounted on the outside of the optical antenna, and the optical antenna and the equipment bracket are arranged concentrically. The equipment bracket is circumferentially provided with a horizontal inclinometer and several laser emitting devices. The photoelectric conversion device is used to collect the optical antenna's echo signal and convert it into an electrical signal. The data acquisition and processing device is used to collect the electrical signal and convert it into distance information, thereby determining the emission angle of the optical antenna. The present invention is used to calibrate and detect the emission direction of an optical antenna, can meet the daily maintenance and performance testing of the optical antenna, can be used to conduct experiments on any optical antenna, and effectively improves measurement accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical antenna calibration equipment, and particularly relates to a system and method for measuring the emission angle of an optical antenna. Background Art

[0002] Traditionally, calibration of the transmit and receive directions of optical antennas relies primarily on fixed-position reference objects, typically using celestial constellations or balloons. These traditional methods have significant limitations. For example, calibrating optical antennas using celestial constellations must be performed on clear nights with high visibility, while balloons offer poor accuracy. Without effective reference objects, aligning the direction of optical antennas is extremely difficult, relying solely on the precision of the antenna's structural machining to ensure alignment. However, for some large optical antennas, the optical mirrors and supporting structures can experience varying degrees of deformation under the influence of gravity and fluctuating ambient temperatures, leading to unpredictable effects on the optical system. Summary of the Invention

[0003] The object of the present invention is to provide a system and method for measuring the emission angle of an optical antenna, aiming to solve the above-mentioned problem.

[0004] The present invention is mainly achieved through the following technical solutions:

[0005] A system for measuring the emission angle of an optical antenna comprises a laser emitting device, a photoelectric conversion device, a data acquisition and processing device, a horizontal inclinometer, and an equipment bracket; the receiving end of the optical antenna is connected to the photoelectric conversion device and the data acquisition and processing device in sequence; the equipment bracket is mounted on the outer side of the optical antenna, and the optical antenna and the equipment bracket are arranged concentrically; the horizontal inclinometer and several laser emitting devices are arranged circumferentially of the equipment bracket; the photoelectric conversion device is used to collect the echo signal of the optical antenna and convert it into an electrical signal, and the data acquisition and processing device is used to collect the electrical signal and convert it into distance information, thereby determining the emission angle of the optical antenna.

[0006] In order to better realize the present invention, further, the equipment bracket includes an annular main bracket, a coaxial bracket, a horizontal support bracket and a laser emission bracket, and the annular main bracket is circumferentially provided with several coaxial brackets, laser emission brackets and horizontal support brackets; the annular main bracket is sleeved on the outside of the optical antenna, and the annular main bracket is coaxially arranged with the optical antenna, and the coaxial bracket passes through the annular main bracket horizontally and abuts against the optical antenna; the laser emission device is arranged on the laser emission bracket, and the horizontal inclinometer is arranged on the annular main bracket.

[0007] During use of the present invention, first, a suitable equipment bracket is selected according to the diameter of the optical antenna, and the equipment bracket is installed on the periphery of the optical antenna. The annular main bracket is fixed to the coaxial axis of the optical antenna using a coaxial bracket. The T-shaped bracket is tangent to the outer diameter of the optical antenna. The three coaxial brackets are adjusted to the same distance using the scale and fine-tuning device of the coaxial bracket, so that the equipment bracket is coaxial with the optical antenna. Then, the horizontal support frame is fixed according to the actual situation. The horizontal support frame is not limited to horizontal placement and can be adjusted according to the emission direction of the optical antenna. The laser emitting device is installed on three different laser hangers that are fixed separately, and a horizontal inclinometer is set on the annular main bracket to detect the angle of the equipment bracket. A photoelectric conversion device is installed at the receiving part of the optical antenna and connected to a data acquisition and processing device.

[0008] In order to better realize the present invention, further, the coaxial bracket includes a T-shaped bracket, a bracket body, a bracket fine-adjustment device and a locking buckle. The bracket body is provided with a bracket fine-adjustment device on the outer threaded sleeve, and the bracket body is connected to the annular main bracket through the bracket fine-adjustment device. The bracket body is provided with several grooves along the length direction, and the locking buckle passes through the bracket fine-adjustment device and is locked with the groove; the abutting end of the bracket body is provided with a T-shaped bracket, and the bracket body is provided with scale lines along the length direction.

[0009] In order to better implement the present invention, further, the bracket fine-tuning device is rotatably connected to the annular main bracket, and the bracket body is slidably connected to the annular main bracket.

[0010] In order to better realize the present invention, further, the horizontal support frame includes a connecting device, a supporting leg and a locking device, the connecting device is provided with a through mounting bayonet corresponding to the annular main bracket, and the corresponding supporting leg is provided with a through supporting port that is perpendicular to the mounting bayonet; a locking device is provided on one side of the mounting bayonet and the supporting port respectively.

[0011] In order to better realize the present invention, further, the annular main bracket is equidistantly provided with a plurality of coaxial brackets, laser emission brackets, and horizontal support brackets in the circumferential direction.

[0012] In order to better realize the present invention, further, the laser emitting device includes a mounting plate and a laser and a beam constrainer arranged on the mounting plate from left to right, and the beam constrainer is used to constrain the emission angle of the laser; the photoelectric conversion device includes an aperture, a collimating lens, a filter and a detector arranged from left to right; the data acquisition and processing device includes an AD acquisition module, an FPGA module and a DSP module arranged from left to right.

[0013] In order to better implement the present invention, further, the pulse width of the laser is no more than 10 ns, and the repetition frequency can be 10-20 Hz; the beam constrictor confines the laser divergence angle of the laser to no more than 1 mrad.

[0014] The present invention is mainly achieved through the following technical solutions:

[0015] A method for measuring the emission angle of an optical antenna is implemented based on the above-mentioned measurement system, and the deflection angle is calculated according to the emission plane and receiving plane of the laser:

[0016]

[0017] Where: α is the tilt angle of the equipment support detected by the horizontal inclinometer;

[0018] n1 is the normal vector of the emission plane of the laser, and n1 is (a, b, c);

[0019] n2 is the normal vector of the receiving plane of the laser light, and n2 is (1, 1, 1).

[0020] Beneficial effects of the present invention:

[0021] (1) The present invention is used to calibrate and detect the emission direction of an optical antenna, which can meet the daily maintenance and performance testing of the optical antenna. Experiments can be performed on any optical antenna. For example, it can be used to calibrate the optical antenna of a wind measurement lidar, which can effectively improve the measurement accuracy.

[0022] (2) The present invention can adjust the position of the annular main bracket by rotating the bracket body, and the position of the bracket body can be accurately adjusted by the scale lines on the bracket body, so that the annular main bracket is accurately located on the concentric axis of the optical antenna, which has good practicality;

[0023] (3) The present invention is rotatably connected to the annular main bracket through the bracket fine-tuning device, making operation more convenient. By simply rotating the bracket fine-tuning device, the bracket body can be moved linearly in the direction of approaching or moving away from the optical antenna, thereby conveniently adjusting the relative position of the annular main bracket and the optical antenna, and having good practicality;

[0024] (4) The measurement method of the present invention is simple and accurate in calculation, reduces the redundancy and complexity of traditional methods, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the installation structure of the present invention;

[0026] Figure 2 Schematic diagram of the laser emission plane and receiving plane of the present invention;

[0027] Figure 3 Principle block diagram of laser emitting device;

[0028] Figure 4 Principle block diagram of the photoelectric conversion device;

[0029] Figure 5 Principle block diagram of data acquisition device;

[0030] Figure 6 Schematic diagram of the structure of the equipment bracket;

[0031] Figure 7 Schematic diagram of the structure of the coaxial bracket;

[0032] Figure 8 Schematic diagram of the structure of the horizontal support frame.

[0033] in:

[0034] 11-laser, 12-beam confinement device, 13-mounting plate;

[0035] 21- aperture, 22- collimator, 23- filter, 24- detector;

[0036] 31-AD acquisition module, 32-FPGA module, 33-DSP module;

[0037] 41-annular main bracket, 42-horizontal support bracket, 43-coaxial bracket, 44-laser launch bracket, 45-horizontal inclinometer;

[0038] 421-connecting device, 422-supporting leg, 423-locking device, 424-mounting bayonet;

[0039] 431-T-type bracket, 432-bracket body, 433-bracket fine-adjustment device, 434-locking buckle, 435-bracket auxiliary scale;

[0040] 01-Optical antenna, 02-Equipment bracket, 03-Laser emitting device, 04-Photoelectric conversion device, 05-Data acquisition and processing device. DETAILED DESCRIPTION

[0041] Example 1:

[0042] A system for measuring the emission angle of an optical antenna, such as Figure 1As shown, it includes a laser emitting device 03, a photoelectric conversion device 04, a data acquisition and processing device 05, a horizontal inclinometer 45 and an equipment bracket 02; the receiving end of the optical antenna 01 is connected to the photoelectric conversion device 04 and the data acquisition and processing device 05 in sequence; the equipment bracket 02 is mounted on the outer side of the optical antenna 01, and the optical antenna 01 and the equipment bracket 02 are arranged concentrically; a horizontal inclinometer 45 and several laser emitting devices 03 are arranged on the circumference of the equipment bracket 02; the photoelectric conversion device 04 is used to collect the echo signal of the optical antenna 01 and convert it into an electrical signal, and the data acquisition and processing device 05 is used to collect the electrical signal and convert it into distance information, thereby determining the emission angle of the optical antenna 01.

[0043] Furthermore, if Figure 3-Figure 5 As shown, the laser emitting device 03 includes a mounting plate 13 and a laser 11 and a beam constrictor 12 arranged on the mounting plate 13 from left to right, and the beam constrictor 12 is used to constrain the emission angle of the laser 11; the photoelectric conversion device 04 includes an aperture 21, a collimating lens 22, a filter 23 and a detector 24 arranged from left to right; the data acquisition and processing device 05 includes an AD acquisition module 31, an FPGA module 32 and a DSP module 33 arranged from left to right.

[0044] During use, the present invention first selects an appropriate device bracket 02 based on the diameter of the optical antenna 01. The bracket 02 is then installed around the periphery of the optical antenna 01, coaxially with the antenna 01. The horizontal mounting position of the bracket 02 is then adjusted based on the actual situation, and can be adjusted according to the emission direction of the optical antenna 01. The laser emitting device 03 is mounted on three separate, fixed laser hangers. A horizontal inclinometer 45 is placed on the annular main bracket 41 to detect the angle of the bracket 02. A photoelectric conversion device 04 is installed at the receiving portion of the optical antenna 01 and connected to a data acquisition and processing device 05.

[0045] The present invention is used to calibrate and detect the emission direction of the optical antenna 01, can meet the daily maintenance and performance testing of the optical antenna 01, and can be used to perform experiments on any optical antenna 01. For example, it can be used to calibrate the wind measurement lidar optical antenna 01, which can effectively improve the measurement accuracy.

[0046] Example 2:

[0047] This embodiment is optimized based on embodiment 1. Figure 6As shown, the equipment bracket 02 includes an annular main bracket 41, a coaxial bracket 43, a horizontal support bracket 42 and a laser emission bracket 44. Several coaxial brackets 43, laser emission brackets 44 and horizontal support brackets 42 are arranged circumferentially of the annular main bracket 41; the annular main bracket 41 is sleeved on the outside of the optical antenna 01, and the annular main bracket 41 and the optical antenna 01 are arranged concentrically, and the coaxial bracket 43 passes through the annular main bracket 41 horizontally and abuts against the optical antenna 01; the laser emitting device 03 is arranged on the laser emission bracket 44, and the horizontal inclinometer 45 is arranged on the annular main bracket 41.

[0048] Furthermore, a plurality of coaxial supports 43 , laser emission brackets 44 , and horizontal support brackets 42 are equidistantly arranged around the annular main bracket 41 .

[0049] During use, the present invention first selects an appropriate device bracket 02 based on the diameter of the optical antenna 01 and installs it around the periphery of the optical antenna 01. Using coaxial brackets 43, the annular main bracket 41 is secured to the concentric axis of the optical antenna 01. The T-shaped bracket 431 is tangential to the outer diameter of the optical antenna 01. Using the scales and fine-tuning mechanisms on the coaxial brackets 43, the three coaxial brackets 43 are adjusted to the same distance, thus aligning the device bracket 02 with the optical antenna 01. The horizontal support bracket 42 is then secured according to actual circumstances. The horizontal support bracket 42 is not limited to a horizontal position and can be adjusted according to the emission direction of the optical antenna 01. The laser emitting device 03 is mounted on three separate laser hangers. A horizontal inclinometer 45 is placed on the annular main bracket 41 to detect the angle of the device bracket 02. The photoelectric conversion device 04 is installed at the receiving portion of the optical antenna 01 and connected to the data acquisition and processing device 05.

[0050] The rest of this embodiment is the same as that of embodiment 1, so it will not be described again.

[0051] Example 3:

[0052] This embodiment is optimized based on embodiment 2. Figure 7 As shown, the coaxial bracket 43 includes a T-shaped bracket 431, a bracket body 432, a bracket fine-adjustment device 433 and a locking buckle 434. The bracket body 432 is provided with a bracket fine-adjustment device 433 on the outer threaded sleeve, and the bracket body 432 is connected to the annular main bracket 41 through the bracket fine-adjustment device 433. The bracket body 432 is provided with several grooves along the length direction, and the locking buckle 434 passes through the bracket fine-adjustment device 433 and is locked with the groove; the abutting end of the bracket body 432 is provided with a T-shaped bracket 431, and the bracket body 432 is provided with scale lines along the length direction.

[0053] Furthermore, a bracket auxiliary scale 435 is provided on the outer end of the bracket body 432 .

[0054] Furthermore, the support fine-tuning device 433 is rotatably connected to the annular main support 41, and the support body 432 is slidably connected to the annular main support 41. During use, the support fine-tuning device 433 can be rotatably connected to the annular main support 41 via a bearing, and the annular main support 41 can be provided with a sliding guide groove corresponding to the support body 432. When the support fine-tuning device 433 is rotated in one direction, the support body 432 drives the T-shaped support 431 in a linear motion toward the optical antenna 01; when the support fine-tuning device 433 is rotated in the opposite direction, the support body 432 drives the T-shaped support 431 in a linear motion away from the optical antenna 01. The present invention's rotatable connection between the support fine-tuning device 433 and the annular main support 41 facilitates operation. Simply rotating the support fine-tuning device 433 can cause the support body 432 to move linearly toward or away from the optical antenna 01, conveniently adjusting the relative position of the annular main support 41 and the optical antenna 01, thus providing excellent practicality.

[0055] The rest of this embodiment is the same as that of the above-mentioned embodiment 2, so it will not be described in detail.

[0056] Example 4:

[0057] This embodiment is optimized based on embodiment 2 or 3. Figure 8 As shown, the horizontal support frame 42 includes a connecting device 421, a supporting leg 422 and a locking device 423. The connecting device 421 is provided with a through mounting bayonet 424 corresponding to the annular main bracket 41, and the corresponding supporting leg 422 is provided with a through supporting port that is perpendicular to the mounting bayonet 424; a locking device 423 is provided on one side of the mounting bayonet 424 and the supporting port respectively.

[0058] Furthermore, the locking device 423 can be set as a locking bolt, which is threadedly connected to the connecting device 421, and one end of the locking bolt extends into the mounting bayonet 424 or the support port and abuts against the annular main bracket 41 or the support leg 422, thereby achieving locking.

[0059] The rest of this embodiment is the same as that of the above-mentioned embodiment 2 or 3, and thus will not be described in detail.

[0060] Example 5:

[0061] A system for measuring the emission angle of an optical antenna, such as Figure 1 As shown, it includes a laser emitting device 03, a photoelectric conversion device 04, a data acquisition and processing device 05, a horizontal inclinometer 45 and an equipment bracket 02.

[0062] Furthermore, if Figure 3 As shown, the laser emitting device 03 includes a laser 11, a beam constrictor 12 and an installation. The pulse width of the laser 11 is not greater than 10ns, and the repetition frequency can be 10 to 20Hz. Before the laser is emitted, the emission angle needs to be constrained by the beam constrictor 12 to constrain the laser divergence angle to no more than 1mrad. There is no requirement for the laser wavelength, but it is recommended to use visible light lasers such as 532nm and 632.8nm lasers, which are faster to install than infrared and ultraviolet lasers.

[0063] Furthermore, if Figure 4 As shown, the photoelectric conversion device 04 includes an aperture 21, a collimator 22, a filter 23 and a detector 24. The aperture 21 is used to constrain the size of the field of view of the optical antenna 01, the collimator 22 is used to convert the converged light in the optical antenna 01 into parallel light, the filter 23 is used to filter out interference light, and the detector 24 is used to convert the photon signal into an electrical signal.

[0064] The entire photoelectric conversion device 04 can receive the laser emitted by the laser emitting device 03 and convert it into an electrical signal. The laser emitting device 03 emits laser into the atmosphere, which is scattered back by particles and molecules in the atmosphere. If the backscattered signal is within the field of view of the optical antenna 01, an echo signal will appear on the optical antenna 01, and the echo signal can be converted into an electrical signal through the photoelectric conversion device 04.

[0065] Furthermore, the photoelectric conversion device 04 can be an avalanche diode or a photodiode, which is selected according to the wavelength of the emitted laser.

[0066] Furthermore, if Figure 5 As shown, the data acquisition device includes an AD acquisition module 31, an FPGA module 32, and a DSP module 33. The AD acquisition module 31 is used to collect analog signals transmitted from the photoelectric conversion device 04, and the sampling rate can be selected to be above 500Msps; the FPGA module 32 uses a 32-bit FPGA for data timing control and the time of recording data for distance calculation; the DSP module 33 is used for data calculation. The data acquisition device can convert the photoelectric signal received by the optical antenna 01 into distance information. The data acquisition device determines the height h = Ct / 2 of the received signal based on the flight time of the echo signal received by the antenna, and calculates the height h = Ct / 2 based on the distance information. Figure 2 The deflection angle is calculated from the transmitting and receiving planes shown in FIG.

[0067] Furthermore, if Figure 6As shown, the equipment bracket 02 includes a main ring bracket 41, a coaxial support bracket, a horizontal support bracket 42, and a laser emission bracket 44. The main ring bracket 41 is a bracket that can fix different components and equipment. The coaxial bracket 43 is used to adjust the main ring bracket 41 to be coaxial with the optical antenna 01. The coaxial bracket 43 has a scale. By adjusting the three coaxial brackets 43 to the same length, the main ring bracket 41 and the optical antenna 01 can be coaxial. The horizontal bracket has the function of supporting and adjusting the level. The laser 11 emission bracket is used to install and fix the laser emission device 03. The number of laser 11 emission brackets is greater than or equal to three and is evenly distributed on the main ring bracket 41. The horizontal inclinometer 45 is installed on the equipment bracket 02 to record the horizontal angle and inclination angle of the equipment.

[0068] Furthermore, if Figure 7 As shown, the coaxial bracket 43 includes a T-shaped bracket, a bracket body 432, a bracket fine-tuning device 433 and a locking buckle 434. There is a groove on the bracket body 432 every 0.5 cm that can be matched and locked with the locking buckle 434. The bracket fine-tuning device 433 can adjust the T-shaped bracket 431 forward and backward by rotation with a range of 2 cm and an accuracy of 1 mm.

[0069] Furthermore, if Figure 8 As shown, the horizontal bracket includes a connecting device 421, a supporting leg 422 and a locking device 423. The connecting device 421 is provided with a through mounting bayonet 424 corresponding to the annular main bracket 41, and the corresponding supporting leg 422 is provided with a through supporting opening that is perpendicular to the mounting bayonet 424; a locking device 423 is provided on one side of the mounting bayonet 424 and the supporting opening respectively.

[0070] During use, the present invention first selects an appropriate device bracket 02 based on the diameter of the optical antenna 01 and installs it around the periphery of the optical antenna 01. Using coaxial brackets 43, the annular main bracket 41 is secured to the concentric axis of the optical antenna 01. The T-shaped bracket 431 is tangential to the outer diameter of the optical antenna 01. Using the scales and fine-tuning mechanisms on the coaxial brackets 43, the three coaxial brackets 43 are adjusted to the same distance, thus aligning the device bracket 02 with the optical antenna 01. The horizontal support bracket 42 is then secured according to actual circumstances. The horizontal support bracket 42 is not limited to a horizontal position and can be adjusted according to the emission direction of the optical antenna 01. The laser emitting device 03 is mounted on three separate laser hangers. A horizontal inclinometer 45 is placed on the annular main bracket 41 to detect the angle of the device bracket 02. The photoelectric conversion device 04 is installed at the receiving portion of the optical antenna 01 and connected to the data acquisition and processing device 05.

[0071] The present invention is used to calibrate and detect the emission direction of the optical antenna 01, can meet the daily maintenance and performance testing of the optical antenna 01, and can be used to perform experiments on any optical antenna 01. For example, it can be used to calibrate the wind measurement lidar optical antenna 01, which can effectively improve the measurement accuracy.

[0072] Example 6:

[0073] A method for measuring the emission angle of an optical antenna, implemented based on the above-mentioned measurement system, comprises the following steps:

[0074] First, select a suitable device bracket 02 according to the diameter of the optical antenna 01, install the device bracket 02 on the periphery of the optical antenna 01, use the coaxial bracket 43 to fix the annular main bracket 41 on the concentric axis of the optical antenna 01, and use the T-shaped bracket 431 to be tangent to the outer diameter of the optical antenna 01. Use the scale and fine-tuning device of the coaxial bracket 43 to adjust the three coaxial brackets 43 to the same distance, so that the device bracket 02 is coaxial with the optical antenna 01.

[0075] Then, secure the horizontal support frame 42 according to the actual situation. The horizontal support frame 42 is not limited to horizontal placement and can be adjusted according to the emission direction of the optical antenna 01. The laser emitting device 03 is mounted on three different laser hangers. A horizontal inclinometer 45 is placed on the annular main support 41 to detect the angle of the equipment support 02. The photoelectric conversion device 04 is installed at the receiving portion of the optical antenna 01 and connected to the data acquisition and processing device 05.

[0076] Use the inclination sensor to record the current angular state direction angle α of the mounting frame;

[0077] The three laser emitting devices 03 distributed on the laser rack emit lasers and record data. The radiation angle of the optical antenna 01 is calculated based on the data, as shown in the following example: Figure 2 As shown, the plane passing through points A, B, and C is assumed to be the receiving plane of the optical antenna 01, and the equation is ax+bx+cx+d=0, and the normal vector of the receiving plane of the optical antenna 01 is n1=(a, b, c); the laser emitting surface is taken as the reference plane, and the equation is x+y+z=0, and the unit normal vector of the emitting plane of the optical antenna 01 is n2(1, 1, 1).

[0078] According to the angle formula between the surfaces, the receiving direction of the optical antenna 01 can be calculated as:

[0079]

[0080] The present invention is used to calibrate and detect the emission direction of the optical antenna 01, can meet the daily maintenance and performance testing of the optical antenna 01, and can be used to perform experiments on any optical antenna 01. For example, it can be used to calibrate the wind measurement lidar optical antenna 01, which can effectively improve the measurement accuracy.

[0081] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A system for measuring the emission angle of an optical antenna, characterized in that: The invention comprises a laser emitting device (03), a photoelectric conversion device (04), a data acquisition and processing device (05), a horizontal inclinometer (45) and an equipment bracket (02); the receiving end of the optical antenna (01) is connected to the photoelectric conversion device (04) and the data acquisition and processing device (05) in sequence; the outer side of the optical antenna (01) is provided with an equipment bracket (02), and the optical antenna (01) and the equipment bracket (02) are arranged concentrically; the equipment bracket (02) is provided with a horizontal inclinometer (45) and a plurality of laser emitting devices (03) in the circumferential direction; the photoelectric conversion device (04) is used to collect the echo signal of the optical antenna (01) and convert it into an electrical signal, and the data acquisition and processing device (05) is used to collect the electrical signal and convert it into distance information, thereby determining the emission angle of the optical antenna (01); The equipment bracket (02) includes an annular main bracket (41), a coaxial bracket (43), a horizontal support bracket (42) and a laser emission bracket (44), and a plurality of coaxial brackets (43), a laser emission bracket (44) and a horizontal support bracket (42) are arranged circumferentially of the annular main bracket (41); the annular main bracket (41) is sleeved on the outside of the optical antenna (01), and the annular main bracket (41) and the optical antenna (01) are arranged coaxially, and the coaxial bracket (43) passes through the annular main bracket (41) transversely and abuts against the optical antenna (01); the laser emission device (03) is arranged on the laser emission bracket (44), and the horizontal inclinometer (45) is arranged on the annular main bracket (41); The coaxial bracket (43) comprises a T-shaped bracket (431), a bracket body (432), a bracket fine-adjustment device (433) and a locking buckle (434); the bracket body (432) is provided with a bracket fine-adjustment device (433) on the outer thread sleeve, and the bracket body (432) is connected to the annular main bracket (41) via the bracket fine-adjustment device (433); the bracket body (432) is provided with a plurality of grooves along the length direction; the locking buckle (434) passes through the bracket fine-adjustment device (433) and is locked in cooperation with the grooves; the abutting end of the bracket body (432) is provided with a T-shaped bracket (431); and the bracket body (432) is provided with scale lines along the length direction; During use, first, a suitable equipment bracket is selected according to the diameter of the optical antenna, and the equipment bracket (02) is installed on the periphery of the optical antenna (01). The annular main bracket (41) is fixed on the coaxial axis of the optical antenna (01) using the coaxial bracket (43). The T-shaped bracket (431) is tangent to the outer diameter of the optical antenna (01). The three coaxial brackets (43) are adjusted to the same distance using the scale and fine-tuning device (433) of the coaxial bracket (43), so that the equipment bracket (02) is coaxial with the optical antenna (01). Then, the horizontal support frame (42) is fixed according to the actual situation. The horizontal support frame (42) is not limited to horizontal placement and can be adjusted according to the emission direction of the optical antenna (01). The laser emitting device (03) is installed on three different laser emitting brackets (44) that are fixed respectively. The horizontal inclinometer (45) is set on the annular main bracket (41) to detect the angle of the equipment bracket. The photoelectric conversion device (04) is installed at the receiving part of the optical antenna, and the data acquisition and processing device (05) is connected.

2. The optical antenna emission angle measurement system according to claim 1, characterized in that: The bracket fine-adjusting device (433) is rotatably connected to the annular main bracket (41), and the bracket body (432) is slidably connected to the annular main bracket (41).

3. The optical antenna emission angle measurement system according to claim 1, characterized in that: The horizontal support frame (42) includes a connecting device (421), a supporting leg (422) and a locking device (423), wherein the connecting device (421) is provided with a through-mounting bayonet (424) corresponding to the annular main bracket (41), and the corresponding supporting leg (422) is provided with a through-mounting support opening that is perpendicular to the mounting bayonet (424); and a locking device (423) is provided on one side of the mounting bayonet (424) and the supporting opening.

4. The optical antenna emission angle measurement system according to claim 1, characterized in that: The annular main support Several coaxial brackets (43), laser emission racks (44), and horizontal support frames (42) are equidistantly arranged around (41).

5. The optical antenna emission angle measurement system according to any one of claims 1 to 4, characterized in that: The laser emitting device (03) comprises a mounting plate (13) and a laser (11) and a beam constrictor (12) arranged on the mounting plate (13) in sequence from left to right, wherein the beam constrictor (12) is used to confine the emission angle of the laser (11); the photoelectric conversion device (04) comprises an aperture (21), a collimating lens (22), a filter (23) and a detector (24) arranged in sequence from left to right; and the data acquisition and processing device (05) comprises an AD acquisition module (31), an FPGA module (32) and a DSP module (33) arranged in sequence from left to right.

6. The optical antenna emission angle measurement system according to claim 5, characterized in that: The pulse width of the laser (11) is no greater than 10 ns, and the repetition frequency can be 10-20 Hz; the beam constrictor (12) confines the laser divergence angle of the laser (11) to no greater than 1 mrad.

7. A method for measuring the emission angle of an optical antenna, implemented based on the measurement system according to any one of claims 1 to 6, characterized in that: The deflection angle is calculated based on the laser emission plane and receiving plane: Wherein: α is the tilt angle of the equipment support (02) detected by the horizontal inclinometer (45); n1 is the normal vector of the emission plane of the laser, and n1 is (a, b, c); n2 is a normal vector of a receiving plane of the laser, and n2 is (1, 1, 1).

Images