Atmospheric aerosol lidar calibrator

Abstract

The present application provides an atmospheric aerosol laser radar calibrator, comprising a circular ring base, a collimating lens seat, a calibration rotating seat and an optoelectronic emission module; the optoelectronic emission module comprises a light-emitting module, an optoelectronic control and driving module and a cable joint; the light-emitting module comprises a metal seat, a semiconductor light-emitting device, a photodiode and a light pipe, and the semiconductor light-emitting device, the photodiode, the optoelectronic control and driving module and the cable joint are connected in series. The atmospheric aerosol laser radar calibrator simulates laser radar echo signals of different atmospheric scenes by generating optoelectronic signals of different wavelengths and different dynamic characteristics. It can calibrate main optoelectronic parameters and indexes of a laser radar under laboratory or field environmental conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of optical equipment, and in particular relates to an atmospheric aerosol laser radar calibrator. Background Art

[0002] Aerosol lidar is an instrument used in Earth science and atmospheric remote sensing to detect the spatiotemporal distribution of the atmosphere. Its transmitter emits monochromatic, polarized, pulsed laser light of one or more wavelengths. It then uses optical devices such as telescopes to receive backscattered signals from atmospheric molecules, aerosols (fine particles), and clouds at different altitudes. The radar then uses the timing and intensity of the received signals to invert the optical properties, microphysical parameters, and morphological characteristics of these molecules and aerosols, enabling observation and quantitative measurement of the spatiotemporal distribution of atmospheric components.

[0003] To achieve accurate quantitative measurements of atmospheric parameters, lidar systems require regular calibration. The precise calibration of multiple system constants for atmospheric detection lidars has long been a key and challenging aspect of laser quantitative remote sensing. Based on the inversion results of lidar detection signals, the magnitude and precise calibration of system constants, such as the linearity of the lidar photoelectric detection channel, the gain ratio and isolation of the polarization channel, the crosstalk between multi-wavelength channels, and the crosstalk from the elastic scattering channel to the Raman scattering channel, directly impact the accuracy of the lidar raw signal, thereby affecting the inversion accuracy of atmospheric optical and microphysical parameters. After a lidar system has been operating for a long time, the stability of the system constants can also be used as an indicator to verify the stability of the lidar system.

[0004] The current common method for measuring and calibrating lidar system constants is performed in an optical laboratory by professional technicians using precision optical and electrical measuring instruments. This method cannot meet the needs of independent, regular, and on-site calibration. Therefore, it is necessary to develop an atmospheric aerosol detection lidar calibrator to calibrate the lidar's key optoelectronic parameters and indicators under laboratory or field conditions. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and provide an atmospheric aerosol lidar calibrator with simple operation and high accuracy.

[0006] The technical solution adopted by the present invention is: an atmospheric aerosol lidar calibrator, including a circular base, a collimating lens seat, a calibration rotating seat and a photoelectric emission module; the photoelectric emission module includes a light-emitting module, a photoelectric control and drive module and a cable connector; the light-emitting module includes a metal seat, a semiconductor light-emitting device, a photodiode and a light guide tube, and the semiconductor light-emitting device, photodiode, photoelectric control and drive module and cable connector are connected in series in sequence.

[0007] Furthermore, the metal seat is a rosette-shaped heat-conducting metal block, on which a plurality of semiconductor light-emitting devices of different wavelengths and a plurality of evenly distributed photodiodes are evenly distributed; the plurality of photodiodes correspond one-to-one to the plurality of semiconductor light-emitting devices, and are used to monitor the light intensity of the semiconductor light-emitting devices and maintain feedback control of the light power of the semiconductor light-emitting devices.

[0008] Furthermore, the photoelectric control and drive template includes a semiconductor light-emitting device constant current drive module, a photodiode feedback module and a PID constant temperature control module installed inside the calibration rotary seat; the photoelectric control and drive template is connected to the control system through a cable connector; the control system transmits the signals of the semiconductor light-emitting device constant current drive module and the semiconductor light-emitting device constant temperature control module as well as the selected channel and power supply to the photoelectric transmission module, and then receives the temperature feedback signals of the photodiode and the PID constant temperature control module; the PID constant temperature control module controls the temperature at a constant temperature within the range of 36 to 45°C to ensure the stability of the emission power and wavelength of the semiconductor light-emitting device.

[0009] Furthermore, the collimating lens seat includes a chassis and an upper edge, the chassis is engaged in the annular base, the upper edge is sleeved on the inner ring of the annular base, and the chassis is embedded with a collimating lens; the calibration rotating seat is located on the upper edge of the collimating lens seat, and is rotatably connected with the collimating lens seat by means of a rotating mechanism; the calibration rotating seat is a dome-shaped structure, on which an elliptical mirror hole is provided, and a reflector block is fixed on the elliptical mirror hole, and an elliptical plane reflector is embedded in the reflector block, and a serial number is marked on the outer surface of the reflector block; the light guide is sleeved on the semiconductor light-emitting device, and the bottom is fixed on the metal seat, and a filter is embedded in the light guide; the semiconductor light-emitting device, the filter, the elliptical reflector and the collimating lens constitute a light emission channel.

[0010] Furthermore, there are multiple optical transmission channels, including high-power channels and polarization-maintaining channels; the high-power channel is used for linearity detection of the laser radar optoelectronic receiving system, and the polarization-maintaining channel is used for crosstalk detection of the polarization channel. The wavelength of the high-power channel is one or more of 355nm, 532nm and 1064nm, and the wavelength of the polarization-maintaining channel is one or more of 355nm, 532nm and 1064nm.

[0011] Furthermore, the filter is an interference filter or a polarization filter, and the semiconductor light emitting device is a lens-collimated LED light emitting diode or a semiconductor laser, whose emission wavelength is a wavelength in the 355-1064nm band, the emission power is 100-1000mW, and the emission angle is 10-120°; the broadband emission of the semiconductor light emitting device uses one or more bandpass filters to further approach the required wavelength, achieving a wavelength less than 10 -7The comprehensive out-of-band suppression light intensity, the bandwidth of the bandpass filter is 2 to 10 nm;

[0012] The polarization-maintaining channel uses a polarization filter with low attenuation and high polarization ratio, and the high polarization ratio is greater than or equal to 1:500, ensuring that a laser emission polarization ratio far greater than that of a typical lidar system is obtained.

[0013] Furthermore, the rotation mechanism includes two limit seats and an arc seat, the arc seat is fixed on the upper surface of the annular base, and its height is flush with the lower edge of the calibration rotating seat, and a gear seat is fixed on the arc seat, and a rotatable gear is installed on the gear seat, and the gear is connected to the rotating knob by means of a rotating shaft; a circular gear with an angle scale is provided on the outer periphery of the calibration rotating seat, and the gear is meshed with the gear; the limit seat is symmetrically fixed on the upper surface of the annular base, and a limit block is provided on the upper side of the limit seat, and the limit block cooperates with the lower edge of the calibration rotating seat; a triangular columnar mark block is also provided on the annular base.

[0014] Furthermore, the number of the elliptical reflectors is 8, which are composed of 4 small reflectors and 4 large reflectors arranged symmetrically; the number of the light-emitting modules is 8, and the number of the collimating lenses is 8, which are composed of 4 small collimating lenses and 4 large collimating lenses arranged symmetrically; the serial numbers of the reflector blocks are the 8 letters AH in sequence; the number of the semiconductor light-emitting devices and photodiodes are 8 respectively, and the metal seat is an octagonal rosette.

[0015] Furthermore, a sealing cover is fixed on the calibration rotary seat, and the cable connector is inserted into the central circular hole of the sealing cover. The cable connector is connected to the controller via a communication cable.

[0016] Furthermore, a partition is provided between adjacent elliptical mirror holes in the calibration rotating seat; the elliptical reflector is mounted on a tiltable ±3° bracket, and the angle is adjusted with the help of a screw and a spring on the top of the bracket, and the spring is sleeved on the screw to keep each semiconductor light-emitting device emitting on the same optical axis of the laser radar system under test; the photoelectric transmitting module is engaged in the calibration rotating seat with the help of a light isolation seat; a card plate is provided on the light isolation seat, and the card plate is engaged with the center end of the partition.

[0017] The beneficial effects achieved by the present invention are as follows: This atmospheric aerosol lidar calibrator simulates lidar echo signals from different atmospheric scenarios by generating photoelectric signals of different wavelengths and dynamic characteristics. It can calibrate the main photoelectric parameters and indicators of lidar in laboratory or field conditions.

[0018] The present invention is lightweight, compact and portable; it can accurately simulate the laser radar echo signal under different sky backgrounds; it can accurately detect the laser radar linearity and give the maximum dynamic range value of the signal; it can accurately calibrate the gain ratio and crosstalk size between the parallel / vertical polarization channels of the laser radar and give quantitative values; it can accurately calibrate the gain ratio and crosstalk size between the elastic scattering / Raman scattering channels of the laser radar and give quantitative values; it can accurately calibrate the gain ratio and crosstalk size between different wavelength channels of the laser radar and give quantitative values.

[0019] The calibrator of the present invention can also simulate the optoelectronic signals of lidars with different wavelengths for the following atmospheric scenes: simulating elastic backscattering signals of polarization channels with wavelengths of 355nm, 532nm and 1064nm during the day and at night; simulating Raman scattering echo signals of nitrogen molecules with wavelengths of 386nm and 607nm; and simulating Raman scattering echo signals of water vapor with a light wavelength of 407nm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the ring-shaped base and the rotating mechanism combined with the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the ring-shaped base and the collimating lens holder combined with the present invention;

[0023] Figure 4 A top view of the calibration rotary seat of the present invention;

[0024] Figure 5 It is a bottom view of the calibration rotary seat of the present invention;

[0025] Figure 6 This is a schematic structural diagram of the collimating lens holder of the present invention;

[0026] Figure 7 This is a schematic structural diagram of the photoelectric emission module of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the semiconductor light emitting device and the metal block combined with the present invention;

[0028] Figure 9 This is a schematic diagram of the metal block structure of the present invention;

[0029] Figure 10 This is a schematic structural diagram of the sealing cover of the present invention;

[0030] Figure 11 This is a schematic diagram of the limit seat structure of the present invention;

[0031] Figure 12This is a schematic structural diagram of the light isolation seat of the present invention;

[0032] Figure 13 Schematic diagram of the back structure of the reflector block of the present invention;

[0033] Figure 14 Schematic diagram of the support structure of the present invention;

[0034] Among them, 1 represents the annular base, 2 represents the collimating lens seat, 3 represents the calibration rotating seat, 4 represents the chassis, 5 represents the upper edge, 6 represents the reflector block, 7 represents the elliptical reflector, 8 represents the serial number, 9 represents the optoelectronic control and drive module, 10 represents the cable connector, 11 represents the semiconductor light-emitting device, 12 represents the light guide, 13 represents the metal seat, 14 represents the interference filter, 15 represents the collimating lens, 16 represents the limit seat, 17 represents the arc seat, 18 represents the gear seat, 19 represents the gear, 20 represents the rotating knob, 21 represents the gear, 22 represents the limit block, 23 represents the triangular prism-shaped mark block, 24 represents the sealing cover, 25 represents the partition, 26 represents the light isolation seat, and 27 represents the bracket. DETAILED DESCRIPTION

[0035] The technical solutions 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 only part of the embodiments of the present invention, rather than all the embodiments.

[0036] like Figures 1-14 As shown, the atmospheric aerosol lidar calibrator includes a circular base 1, a collimating lens seat 2, a calibration rotating seat 3 and a photoelectric emission module; the photoelectric emission module includes a light-emitting module, a photoelectric control and drive module 9 and a cable connector 10; the light-emitting module includes a metal seat 13, a semiconductor light-emitting device 11, a photodiode and a light pipe 12, and the semiconductor light-emitting device 11, the photodiode, the photoelectric control and drive module 9 and the cable connector 10 are connected in series in sequence.

[0037] The metal seat 13 is a rosette-shaped heat-conducting metal block, on which multiple semiconductor light-emitting devices 11 of different wavelengths and multiple evenly distributed photodiodes are evenly distributed; the multiple photodiodes correspond one-to-one to the multiple semiconductor light-emitting devices 11, and are used to monitor the light intensity of the semiconductor light-emitting devices 11 and maintain feedback control of the light power of the semiconductor light-emitting devices 11.

[0038] The photoelectric control and drive template 9 includes a semiconductor light-emitting device constant current drive module, a photodiode feedback module and a PID constant temperature control module installed inside the calibration rotary seat 3; the photoelectric control and drive template 9 is connected to the control system through a cable connector 10; the control system transmits the signals of the semiconductor light-emitting device constant current drive module and the semiconductor light-emitting device constant temperature control module as well as the selected channel and power supply to the photoelectric emission module, and then receives the temperature feedback signals of the photodiode and the PID constant temperature control module; the PID constant temperature control module controls the temperature at a constant temperature within the range of 36 to 45°C to ensure the stability of the emission power and wavelength of the semiconductor light-emitting device 11.

[0039] The collimating lens seat 2 includes a chassis 4 and an upper edge 5, the chassis 4 is engaged in the annular base 1, the upper edge 5 is sleeved on the inner ring of the annular base 1, and the chassis 4 is embedded with a collimating lens 15; the calibration rotating seat 3 is located on the upper edge 5 of the collimating lens seat 2, and is rotatably connected to the collimating lens seat 2 by means of a rotation mechanism; the calibration rotating seat 3 is a dome-shaped structure, on which an elliptical mirror hole is provided, and a reflector block 6 is fixed on the elliptical mirror hole, and an elliptical plane reflector 7 is embedded in the reflector block 6, and the outer surface of the reflector block 6 is marked with a serial number 8; the light guide 12 is sleeved on the semiconductor light-emitting device 11, and the bottom is fixed on the metal seat 13, and the light guide 12 is embedded with a filter 14; the semiconductor light-emitting device 11, the filter 14, the elliptical reflector 7 and the collimating lens 15 constitute a light emission channel.

[0040] There are multiple optical transmission channels, including high-power channels and polarization-maintaining channels; the high-power channel is used for linearity detection of the laser radar optoelectronic receiving system, and the polarization-maintaining channel is used for crosstalk detection of the polarization channel. The wavelength of the high-power channel is one or more of 355nm, 532nm and 1064nm, and the wavelength of the polarization-maintaining channel is one or more of 355nm, 532nm and 1064nm.

[0041] The filter 14 is an interference filter or a polarization filter. The semiconductor light-emitting device 11 is a lens-collimated LED or a semiconductor laser, with an emission wavelength within the 355-1064 nm range, an emission power of 100-1000 mW, and an emission angle of 10-120°. The broadband emission of the semiconductor light-emitting device 11 is further approximated to the desired wavelength using one or more bandpass filters to achieve an integrated out-of-band suppression intensity of less than 10-7. The bandwidth of the bandpass filter is selectable between 2 and 10 nm.

[0042] The polarization-maintaining channel uses a polarization filter with low attenuation and high polarization ratio, and the high polarization ratio is greater than or equal to 1:500, ensuring that a laser emission polarization ratio far greater than that of a typical lidar system is obtained.

[0043] The rotation mechanism includes two limit seats 16 and an arc seat 17. The arc seat 17 is fixed on the upper surface of the annular base 1, and its height is flush with the lower edge of the calibration rotating seat 3. A gear seat 18 is fixed on the arc seat 17, and a rotatable gear 19 is installed on the gear seat 18. The gear 19 is connected to the rotating knob 20 by means of a rotating shaft; a circular gear 21 with an angle scale is provided on the outer periphery of the calibration rotating seat 3, and the gear 21 is meshed with the gear 19; the limit seat 16 is symmetrically fixed on the upper surface of the annular base 1, and a limit block 22 is provided on the upper side of the limit seat 16, and the limit block 22 cooperates with the lower edge of the calibration rotating seat 3; a triangular columnar mark block 23 is also provided on the annular base 1.

[0044] There are eight elliptical reflectors 7, which are composed of four symmetrically arranged small reflectors and four large reflectors; there are eight light-emitting modules, and eight collimating lenses 15, which are composed of four symmetrically arranged small collimating lenses and four large collimating lenses; the serial numbers of the reflector blocks 6 are the eight letters AH in sequence; there are eight semiconductor light-emitting devices 11 and eight photodiodes respectively, and the metal seat 13 is an octagonal rosette.

[0045] A sealing cover 24 is also fixed on the calibration rotary seat 3 , and the cable connector 10 is inserted into the central circular hole of the sealing cover 24 . The cable connector 10 is connected to the controller via a communication cable.

[0046] A partition 25 is provided between adjacent elliptical mirror holes in the calibration rotating seat 3; the elliptical reflector 7 is mounted on a tiltable ±3° bracket 27, and the angle is adjusted with the help of a screw and a spring on the top of the bracket 27. The spring is sleeved on the screw to keep each semiconductor light-emitting device emitting on the same optical axis of the laser radar system under test; the photoelectric transmitting module is engaged in the calibration rotating seat 3 with the help of a light isolation seat 26; a card is provided on the light isolation seat 26, and the card is engaged with the center end of the partition 25.

[0047] During specific implementation: the control system controls different light-emitting diodes in the photoelectric transmission module to emit different wavelengths, and combines the collimating lens 15, the interference filter (or polarizer) 14 and the elliptical reflector 7 to form different light transmission channels, such as high-power channels or polarization-maintaining channels. The PID constant temperature control module controls the temperature at 40°C and keeps it constant. The calibration rotary seat 3 is rotated by turning the rotary knob 20 and then the gear 19 as needed to select the polarization direction that matches the polarization direction of the laser radar optical receiving channel for calibration. Both the limit seat and the arc seat can ensure the stability of the rotary seat 3 during rotation. The triangular columnar mark block 23 facilitates timely and accurate positioning. A light-shielding partition 25 is provided between adjacent elliptical mirror holes in the calibration rotary seat 3 to prevent light interference between different channels. The elliptical reflector 7 is mounted on a tiltable ±3° bracket 27, and the angle is adjusted with the help of the screws and springs at the top of the bracket 27.

[0048] Data testing:

[0049] This atmospheric aerosol lidar calibrator was tested using a UV Raman polarization lidar (laser wavelength 355nm) and a multi-wavelength Raman polarization atmospheric sounding lidar. The calibrators' functions were tested and their performance analyzed. These two lidar systems possess multi-wavelength detection capabilities, with optoelectronic receiving channels covering signals from 355nm polarization (parallel and perpendicular), 532nm polarization (parallel and perpendicular), 1064nm elastic scattering, and 386nm, 407nm, and 607nm Raman scattering.

[0050] The six wavelength light channels of the calibrator were tested using the two multi-wavelength lidars mentioned above. The test results are summarized in Table 1. The linearity of the elastic scattering 355, 532, 1064 and Raman scattering 386, 407, 607 channels of the lidar was tested using the calibrator. The test results show that the linear fitting parameter R 2 Both are greater than 0.98, indicating that the tested laser radar has good linearity. This result is consistent with the results measured by the two laser radars in the optical laboratory using professional optoelectronic instruments and equipment, proving that the calibrator's calibration function for the linearity of the laser radar optoelectronic acquisition system is normal.

[0051] Table 1 Linearity test results of atmospheric aerosol lidar calibrator

[0052] Channel <![CDATA[线性度(R^ 2 )]]> Abnormal 355 0.9999 No 532 0.9948 No 386 0.9998 No 407 0.9993 No 607 0.9998 No 1064 0.9894 No No

[0053] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. Atmospheric aerosol lidar calibrator, characterized by: The invention comprises a circular base (1), a collimating lens seat (2), a calibration rotary seat (3) and a photoelectric emission module; the photoelectric emission module comprises a light-emitting module, a photoelectric control and drive module (9) and a cable connector (10); the light-emitting module comprises a metal seat (13), a semiconductor light-emitting device (11), a photodiode and a light pipe (12); the semiconductor light-emitting device (11), the photodiode, the photoelectric control and drive module (9) and the cable connector (10) are sequentially connected in series; The collimating lens seat (2) comprises a chassis (4) and an upper edge (5), wherein the chassis (4) is engaged in the annular base (1), the upper edge (5) is sleeved on the inner ring of the annular base (1), and the chassis (4) is embedded with a collimating lens (15); the calibration rotating seat (3) is located on the upper edge (5) of the collimating lens seat (2), and is rotatably connected to the collimating lens seat (2) by means of a rotating mechanism; the calibration rotating seat (3) is a dome-shaped structure, on which an elliptical mirror hole is provided. A reflector block (6) is fixed on the circular mirror hole, an elliptical reflector (7) is embedded in the reflector block (6), and a serial number (8) is marked on the outer surface of the reflector block (6); the light pipe (12) is sleeved on the semiconductor light emitting device (11), and the bottom is fixed on the metal seat (13); the light pipe (12) is embedded in the filter (14); the semiconductor light emitting device (11), the filter (14), the elliptical reflector (7) and the collimating lens (15) constitute a light emission channel; The number of the elliptical reflectors (7) is 8, consisting of 4 symmetrically arranged small reflectors and 4 large reflectors; the number of the light-emitting modules is 8, the number of the collimating lenses (15) is 8, consisting of 4 symmetrically arranged small collimating lenses and 4 large collimating lenses; the serial numbers of the reflector blocks (6) are the 8 letters AH in sequence; the number of the semiconductor light-emitting devices (11) and the number of the photodiodes are 8 respectively, and the metal seat (13) is an octagonal rosette; The metal seat (13) is a rosette-shaped heat-conducting metal block, on which a plurality of semiconductor light-emitting devices (11) of different wavelengths and a plurality of evenly distributed photodiodes are evenly distributed; The plurality of photodiodes correspond one-to-one to the plurality of semiconductor light-emitting devices (11), and are used to monitor the light intensity of the semiconductor light-emitting devices (11) and maintain feedback control of the light power of the semiconductor light-emitting devices (11).

2. The atmospheric aerosol lidar calibrator according to claim 1, characterized in that: The photoelectric control and drive template (9) includes a semiconductor light emitting device constant current drive module, a photodiode feedback module and a PID constant temperature control module installed inside the calibration rotary seat (3); the photoelectric control and drive template (9) is connected to the control system through a cable connector (10); the control system transmits the signals of the semiconductor light emitting device constant current drive module and the semiconductor light emitting device constant temperature control module as well as the selected channel and power supply to the photoelectric transmission module, and then receives the temperature feedback signals of the photodiode and the PID constant temperature control module; the PID constant temperature control module controls the temperature to a constant temperature within the range of 36 to 45°C to ensure the stability of the emission power and wavelength of the semiconductor light emitting device (11).

3. The atmospheric aerosol lidar calibrator according to claim 1, characterized in that: There are multiple optical transmission channels, including high-power channels and polarization-maintaining channels; the high-power channel is used for linearity detection of the laser radar optoelectronic receiving system, and the polarization-maintaining channel is used for crosstalk detection of the polarization channel. The wavelength of the high-power channel is one or more of 355nm, 532nm and 1064nm, and the wavelength of the polarization-maintaining channel is one or more of 355nm, 532nm and 1064nm.

4. The atmospheric aerosol lidar calibrator according to claim 3, characterized in that: The filter (14) is an interference filter or a polarization filter, and the semiconductor light emitting device (11) is a lens-collimated LED light emitting diode or a semiconductor laser, with an emission wavelength of one wavelength in the 355-1064 nm band, an emission power of 100-1000 mW, and an emission angle of 10-120°; the broadband emission of the semiconductor light emitting device (11) uses one or more bandpass filters to further approach the required wavelength, achieving a wavelength less than 10 -7 The comprehensive out-of-band suppression light intensity, the bandwidth of the bandpass filter is 2~10nm; The polarization-maintaining channel uses a polarization filter with low attenuation and high polarization ratio, and the high polarization ratio is greater than or equal to 1:500, ensuring that a laser emission polarization ratio far greater than that of a typical lidar system is obtained.

5. The aerosol laser radar calibrator according to claim 1, characterized in that: The rotating mechanism comprises two limiting seats (16) and an arc seat (17), wherein the arc seat (17) is fixed on the upper surface of the annular base (1) and its height is flush with the lower edge of the calibration rotating seat (3); a gear seat (18) is fixed on the arc seat (17), and a rotatable gear (19) is installed on the gear seat (18), and the gear (19) is connected to the rotating knob (20) by means of a rotating shaft; a circular gear (21) with an angle scale is provided on the outer periphery of the calibration rotating seat (3), and the gear (21) is meshed with the gear (19); the limiting seat (16) is symmetrically fixed on the upper surface of the annular base (1), and a limiting block (22) is provided on the upper side of the limiting seat (16), and the limiting block (22) cooperates with the lower edge of the calibration rotating seat (3); and a triangular columnar standard block (23) is also provided on the annular base (1).

6. The aerosol laser radar calibrator according to claim 1, characterized in that: A sealing cover (24) is also fixed on the calibration rotary seat (3), and the cable connector (10) is inserted into the central circular hole of the sealing cover (24). The cable connector (10) is connected to the controller via a communication cable.

7. The aerosol laser radar calibrator according to claim 1, characterized in that: A partition (25) is provided between adjacent elliptical mirror holes in the calibration rotary seat (3); the elliptical reflector (7) is mounted on a tiltable ±3° bracket (27), and the angle is adjusted by means of a screw and a spring on the top of the bracket (27); the spring is sleeved on the screw to keep each semiconductor light-emitting device emitting on the same optical axis of the laser radar system under test; the photoelectric emission module is engaged in the calibration rotary seat (3) by means of a light isolation seat (26); a card is provided on the light isolation seat (26), and the card is engaged with the center end of the partition (25).

Images