CN210487989U - Wind measurement laser radar system - Google Patents
Wind measurement laser radar system Download PDFInfo
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- CN210487989U CN210487989U CN201921049499.XU CN201921049499U CN210487989U CN 210487989 U CN210487989 U CN 210487989U CN 201921049499 U CN201921049499 U CN 201921049499U CN 210487989 U CN210487989 U CN 210487989U
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Abstract
The utility model provides a anemometry laser radar system, including signal generation module, signal transceiver module, signal processing module, circulator, signal generation module exports local oscillator light signal to signal processing module, to the first light signal of circulator output, signal transceiver module receives the signal of circulator, and to the first light signal of air emission that awaits measuring, signal transceiver module receives the echo signal that first light signal and aerosol particle interact produced in the air that awaits measuring, and output to the circulator, circulator output echo signal to signal processing module. The signal generation module comprises a seed laser, an optical switch, an optical beam splitter and an acousto-optic modulator, wherein the optical switch is connected between the output end of the seed laser and the input end of the optical beam splitter. The utility model discloses an above module design realizes the measurement to wind field information. Meanwhile, the direct current noise of the acousto-optic modulator is suppressed by selecting and connecting the optical switch.
Description
Technical Field
The utility model relates to a survey radar technical field, specifically are to a anemometry laser radar system.
Background
The Doppler wind lidar has high resolution, high precision and large detection range, can provide three-dimensional wind field information under clear sky conditions, has important application in the fields of weather and wind power generation, and has the working principle that the radial velocity of an atmospheric wind field is determined by measuring the frequency shift amount of aerosol scattering signals in the atmosphere. The magnitude of the frequency shift is usually obtained by direct detection or coherent detection, in which a coherent detection technique measures a difference frequency signal between an echo signal and a transmitted local oscillator optical signal. However, these methods can only determine the absolute value of the frequency shift, and cannot determine the direction of the frequency shift, so people often add a fixed frequency shift to the measurement optical path to implement the method. Acousto-optic modulators are becoming more and more widely used due to their advantages such as small size and ease of installation. The operating principle of the newly introduced acousto-optic modulator is that the frequency shift is generated to the laser by utilizing the interaction of the Bragg diffraction sound field and the light, and the frequency shift error is inevitably generated due to the line width of the laser, the divergence angle of the sound field and the influence of an electronic circuit. In a high-precision Doppler radar system, the frequency shift quantity of a measured echo signal determines the radial velocity of a target, and the frequency shift measurement accuracy of the echo signal is influenced by the frequency shift error of an acousto-optic modulator, so that the misjudgment of the atmospheric radial velocity is caused.
Therefore, noise of the acousto-optic modulator in a working loop has certain influence on the frequency shift measurement accuracy, and how to effectively inhibit the noise of the acousto-optic modulator is one of research hotspots of a wind lidar system introducing the acousto-optic modulator.
Disclosure of Invention
The utility model aims at providing a anemometry laser radar system based on photoswitch's application, can realize cutting off local oscillator light signal before acousto-optic modulator pulse signal takes place to can restrain acousto-optic modulator at the direct current noise that gets into the steady state initial stage, the SNR of lift system.
In order to achieve the above object, the wind lidar system provided by the present invention comprises a signal generating module, a signal transceiver module, a signal processing module, and a circulator, wherein the signal generating module outputs a local oscillator optical signal to the signal processing module, the signal generating module outputs a first optical signal to the circulator, the signal transceiver module receives a signal from the circulator, a first optical signal transceiving module is transmitted to the air to be detected to receive an echo signal generated by interaction of the first optical signal and aerosol particles in the air to be detected and output the echo signal to a circulator, the circulator outputs the echo signal to a signal processing module, the signal generation module comprises a seed laser, an optical switch, an optical beam splitter and an acousto-optic modulator, wherein the optical switch is connected between the output end of the seed laser and the input end of the optical beam splitter, and the first input end of the acousto-optic modulator is connected with the first output end of the optical beam splitter.
According to the above technical scheme, the utility model discloses in can realize local oscillator light signal, echo signal's output through signal generation module, signal transceiver module to output local oscillator light signal, echo signal to signal processing module through the circulator. The signal generation module, the signal receiving and transmitting module and the signal processing module can realize the generation, the transmission, the reception and the processing of the signal. Meanwhile, the optical switch is connected between the output end of the seed laser and the input end of the optical beam splitter, the transmission and the cut-off of the local oscillator optical signal can be realized through the on-off of the optical switch, the seed laser signal can be cut off before the pulse signal of the acousto-optic modulator occurs, and therefore the direct current noise of the acousto-optic modulator is restrained.
The signal generation module further comprises an erbium-doped fiber amplifier, wherein the input end of the erbium-doped fiber amplifier is connected with the output end of the acousto-optic modulator, and the output end of the erbium-doped fiber amplifier is connected with the input end of the circulator.
In a further scheme, the erbium-doped fiber amplifier is a multi-stage erbium-doped fiber amplifier.
Therefore, the wind lidar system can realize signal modulation and amplification of the local oscillator optical signal and output a first optical signal to the circulator.
In a further scheme, the signal transceiver module comprises a telescope and a wedge-shaped mirror which are arranged in sequence.
It can be seen that through the setting of telescope and wedge mirror, can realize the expansion collimation of light beam and to the air transmission that awaits measuring, the echo signal of receiving the aerosol particle scattering in the air that awaits measuring simultaneously.
According to a further scheme, the signal processing module comprises a coupler, a balance detector, an analog-to-digital converter, an FPGA module and an upper computer which are sequentially connected, wherein a first output end of the FPGA module is connected with an input end of the upper computer, and a second output end of the FPGA module is connected with an optical switch.
In a further embodiment, the first input terminal of the coupler is connected to the second output terminal of the optical splitter, and the second input terminal of the coupler is connected to the ring-shaped output terminal.
According to the design of the coupler and the balance detector, the wind lidar system can perform beat frequency processing on the local oscillator optical signal and the echo signal to generate and output the accumulated frequency shift signal, and can realize data processing on the accumulated frequency shift signal to obtain wind speed information based on the design of the analog-to-digital converter, the FPGA module and the upper computer. Meanwhile, through the connection of the FPGA module and the optical switch, the on-off of the optical switch can be subjected to time sequence control based on the obtained digital signal, and the local oscillator optical signal can be cut off before the pulse signal of the acousto-optic modulator occurs, so that the direct current noise of the acousto-optic modulator is suppressed to a greater extent.
Drawings
Fig. 1 is the utility model relates to a structural schematic diagram of anemometry lidar system embodiment.
Detailed Description
Referring to fig. 1, fig. 1 is a block diagram illustrating an embodiment of an optical fiber amplifier having a compensation signal source according to the present invention.
This anemometry laser radar system includes signal generation module 1, signal processing module 2, signal transceiver module 3, circulator 4, signal generation module 1 exports local oscillator light signal to signal processing module 2, signal generation module 1 exports first light signal to circulator 4, signal transceiver module 3 receives the signal of circulator 4 output, and to the first light signal of air emission that awaits measuring, signal transceiver module 3 receives the echo signal that first light signal and the aerosol granule interact produced in the air that awaits measuring and exports circulator 4, circulator 4 outputs echo signal to signal processing module 3.
In this embodiment, the signal generating module 1 includes a seed laser 10, an optical switch 11, an optical splitter 12, an acousto-optic modulator 13, and an erbium-doped fiber amplifier 14, which are connected in sequence, and is configured to amplify the local oscillation optical signal to generate the first optical signal. The seed laser 10 is used for transmitting a local oscillation optical signal, and the optical switch 11 is used for realizing the on-off of an optical path; the optical splitter 12 is configured to split the local oscillation optical signal into two optical signals, where one optical signal is transmitted to the erbium-doped fiber amplifier 14, and the other optical signal is transmitted to the signal processing module 2; the acousto-optic modulator 13 is used for modulating the local oscillator optical signal and generating a pulse laser signal after frequency shift; the erbium-doped fiber amplifier 14 amplifies the pulse laser signal. Preferably, the erbium doped fiber amplifier 14 is a multi-stage erbium doped fiber amplifier.
The signal transceiver module 3 can transmit the first optical signal to the air to be detected and receive the echo signal generated by interaction of the first optical signal and aerosol particles in the air to be detected, and output the echo signal to the circulator 4, wherein the telescope and the wedge mirror are sequentially arranged.
The signal processing module 2 comprises a coupler 21, a balance detector 22, an analog-to-digital converter 23, an FPGA module 24 and an industrial personal computer 25 which are connected in sequence, wherein a first input end of the coupler 21 is connected with a second output end of the beam splitter 12, a second input end of the coupler 21 is connected with an output end of the circulator 4, a first output end of the FPGA module 24 is connected with an input end of an upper computer, and a second output end of the FPGA module 24 is connected with the optical switch 11. Wherein, the coupler 21 couples the local oscillation optical signal and the echo signal and outputs the coupled signals to the balanced detector 22; the balance detector 22 is used for performing beat frequency processing on the coupled local oscillation optical signal and echo signal and outputting an accumulated frequency shift electric signal; the analog-to-digital converter 23 is used for converting the electric signals into digital signals and sending the digital signals to the FPGA module; the FPGA module 24 may perform signal processing according to the digital signal to obtain a speed value of the wind speed to be measured, and send the speed value to the industrial personal computer 25. Meanwhile, the FPGA module 24 may perform timing control on the optical switch 11 based on a system working timing, so as to turn off the optical switch before the pulse signal of the acousto-optic modulator 13 occurs.
The working process of the embodiment is as follows:
the seed laser 10 outputs a local oscillator optical signal, which is transmitted to the optical splitter 12 when the optical switch 11 is in the on state. The optical splitter 12 splits the local oscillation optical signal into two optical signals, one of which is transmitted to the acousto-optic modulator 13 as an input signal to be modulated and amplified, and the other is transmitted to the coupler 21 as a local oscillation optical signal to be subjected to beat frequency processing. The acousto-optic modulator 13 modulates the received local oscillation optical signal to generate a pulse laser signal, and outputs the pulse laser signal to the erbium-doped optical fiber amplifier 14 after frequency shift is generated on the pulse laser signal, the erbium-doped optical fiber amplifier 14 performs multi-stage amplification processing on the received signal and outputs a first optical signal to the circulator 4, the circulator 4 receives the first optical signal and outputs the first optical signal to the signal transceiver module 3, the signal transceiver module 3 realizes the expansion collimation of the light beam and transmits the first optical signal to the air to be measured through a telescope and a wedge mirror which are sequentially arranged, receives an echo signal generated by the interaction between the first optical signal and aerosol particles in the air to be measured, and outputs the echo signal to the circulator 4, the circulator 4 outputs the received echo signal to the coupler 21, the coupler 21 couples the local oscillation optical signal output by the optical beam splitter 12 and the echo signal output by the circulator 4 and outputs the coupled signal to the balance detector 22, the balance detector 22 performs beat frequency processing on the coupled local oscillation optical signal and the echo signal to generate a plurality of frequency shift signals related to wind field information, and accumulates the plurality of frequency shift signals to output an electric signal to the analog-to-digital converter 23, the analog-to-digital converter 23 converts the electric signal into a digital signal and outputs the digital signal to the FPGA module 24, and the FPGA module 24 performs algorithm processing according to the digital signal to obtain a speed value of the wind speed to be measured and sends the speed value to the industrial personal computer 25. Meanwhile, the FPGA module 24 performs timing control on the optical switch 11 to cut off the local oscillator optical signal before the pulse signal of the acousto-optic modulator 13 occurs, and after the acousto-optic modulator 13 enters a stable state for a certain time interval, for example, 5 nanoseconds, the optical switch is turned on, thereby suppressing the direct current noise of the acousto-optic modulator 13.
To sum up, the utility model relates to a wind measurement laser radar system realizes the measurement of wind field information through the design to signal generation module, signal transceiver module, signal processing module and circulator. Meanwhile, the optical switch is selected and connected, and the FPGA module is adopted to perform time sequence control on the optical switch, so that the local oscillator optical signal can be cut off before the pulse signal of the acousto-optic modulator occurs, the direct current noise of the acousto-optic modulator at the initial stage of entering a stable state can be restrained, and the signal-to-noise ratio of the system is improved.
Finally, it should be emphasized that the above-described embodiments are merely preferred examples of the present invention, and are not intended to limit the invention, as those skilled in the art will appreciate that various changes and modifications may be made, and any and all modifications, equivalents, and improvements made, while remaining within the spirit and principles of the present invention, are intended to be included within the scope of the present invention.
Claims (6)
1. A wind lidar system comprises a signal generation module, a signal transceiver module, a signal processing module and a circulator, wherein the signal generation module outputs a local oscillator optical signal to the signal processing module, the signal generation module outputs a first optical signal to the circulator, the signal transceiver module receives a signal of the circulator and transmits the first optical signal, the signal transceiver module receives an echo signal formed by reflecting the first optical signal and outputs the echo signal to the circulator, and the circulator outputs the echo signal to the signal processing module;
the method is characterized in that:
the signal generation module comprises a seed laser, an optical switch, an optical beam splitter and an acousto-optic modulator, wherein the optical switch is connected between the output end of the seed laser and the input end of the optical beam splitter, and the first input end of the acousto-optic modulator is connected with the first output end of the optical beam splitter.
2. The wind lidar system of claim 1, wherein: the signal generation module further comprises an erbium-doped fiber amplifier, the input end of the erbium-doped fiber amplifier is connected with the output end of the acousto-optic modulator, and the output end of the erbium-doped fiber amplifier is connected with one input end of the circulator.
3. The wind lidar system of claim 2, wherein: the erbium-doped fiber amplifier is a multi-stage erbium-doped fiber amplifier.
4. The wind lidar system of claim 1, wherein: the signal receiving and transmitting module comprises a telescope and a wedge-shaped mirror which are arranged in sequence.
5. The wind lidar system of claim 1, wherein: the signal processing module comprises a coupler, a balance detector, an analog-to-digital converter, an FPGA module and an industrial personal computer which are sequentially connected, wherein a first output end of the FPGA module is connected with an input end of the industrial personal computer, and a second output end of the FPGA module is connected with the optical switch.
6. The wind lidar system of claim 5, wherein: the first input end of the coupler is connected with the second output end of the optical beam splitter, and the second input end of the coupler is connected with one output end of the circulator.
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| CN201921049499.XU CN210487989U (en) | 2019-07-05 | 2019-07-05 | Wind measurement laser radar system |
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| CN201921049499.XU CN210487989U (en) | 2019-07-05 | 2019-07-05 | Wind measurement laser radar system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641100A (en) * | 2020-05-29 | 2020-09-08 | 上海科乃特激光科技有限公司 | Laser output control device, control method and laser wind-finding radar |
| CN111817127A (en) * | 2020-07-07 | 2020-10-23 | 上海瀚宇光纤通信技术有限公司 | Output control device and control method of laser and laser wind measuring radar |
| CN114578319A (en) * | 2022-05-06 | 2022-06-03 | 武汉镭晟科技有限公司 | Fiber laser module for free space gas remote sensing laser radar |
| CN118033675A (en) * | 2024-04-11 | 2024-05-14 | 珠海光恒科技有限公司 | Handheld laser wind-finding radar system |
-
2019
- 2019-07-05 CN CN201921049499.XU patent/CN210487989U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641100A (en) * | 2020-05-29 | 2020-09-08 | 上海科乃特激光科技有限公司 | Laser output control device, control method and laser wind-finding radar |
| CN111641100B (en) * | 2020-05-29 | 2021-07-30 | 上海科乃特激光科技有限公司 | Laser output control device, control method and laser wind-finding radar |
| CN111817127A (en) * | 2020-07-07 | 2020-10-23 | 上海瀚宇光纤通信技术有限公司 | Output control device and control method of laser and laser wind measuring radar |
| CN114578319A (en) * | 2022-05-06 | 2022-06-03 | 武汉镭晟科技有限公司 | Fiber laser module for free space gas remote sensing laser radar |
| CN118033675A (en) * | 2024-04-11 | 2024-05-14 | 珠海光恒科技有限公司 | Handheld laser wind-finding radar system |
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