CN214151058U - Dual-beam laser radar wind field detection device - Google Patents
Dual-beam laser radar wind field detection device Download PDFInfo
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- CN214151058U CN214151058U CN202023027149.9U CN202023027149U CN214151058U CN 214151058 U CN214151058 U CN 214151058U CN 202023027149 U CN202023027149 U CN 202023027149U CN 214151058 U CN214151058 U CN 214151058U
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Abstract
The utility model provides a dual-beam laser radar wind field detection device, which comprises a first laser transmitting and receiving mechanism, a second laser transmitting and receiving mechanism, a master control unit, an acquisition and processing unit and an operation display unit; the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism are arranged on the same plane, and laser beams transmitted by the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism are also on the same plane; the distance between the laser emitting positions of the first laser emitting and receiving mechanism and the second laser emitting and receiving mechanism is a, and the included angle between the optical axes of the laser beams emitted by the first laser emitting and receiving mechanism and the second laser emitting and receiving mechanism is theta; the master control unit controls the lasers and the detectors of the two laser transmitting and receiving mechanisms and the acquisition processing unit to act according to time sequences, the acquisition processing unit is responsible for acquiring and processing the detector signals of the two laser transmitting and receiving mechanisms, and the direction and the speed of a wind field are obtained based on similar calculation according to the acquired laser backscattering signal amplitude and the transmitted laser energy value.
Description
Technical Field
The utility model relates to a dual beam laser radar wind field detection device belongs to wind field detection field.
Background
The atmospheric wind field is an important atmospheric physical parameter, and accurate atmospheric wind field observation has great significance for atmospheric pollution prevention, aerospace safety improvement, military environment forecast, climate research model improvement, long-term weather forecast accuracy improvement and the like. The wind measurement laser radar is used as an active atmosphere remote sensing instrument, has the advantages of high wind field measurement precision, high time and space resolution, no influence of ground clutter and the like, and is very suitable for rapid and accurate wind field measurement.
The Doppler wind lidar realizes the detection of the wind field by measuring the Doppler frequency shift of atmospheric molecules and aerosol particles moving along with the wind field to laser, and is divided into coherent detection and direct detection according to different measurement implementation modes. The Doppler coherent detection utilizes an echo signal and local oscillator laser to carry out optical frequency mixing, the Doppler frequency shift caused by moving particles is obtained by subtracting the initial frequency offset from the frequency of a difference frequency signal, and the coherent detection has higher requirements on the coherence of the laser, so that an optical device has high processing difficulty, high cost and complex optical path. The direct doppler detection is to convert the frequency shift of light into the change of light power or spatial distribution of light power that can be directly measured by using an optical frequency discriminator or a spectrum analyzer, and has high requirements on the frequency stability of a laser and a complex system.
Disclosure of Invention
The utility model discloses technical solution problem: the defects of the prior art are overcome, a dual-beam laser radar wind field detection device is provided, the laser radar device inverts the wind speed based on the fluctuation of the intensity of an echo signal caused by an uneven aerosol structure, the requirement on the coherence of a light source is not high, the limitation on the spectrum width is not strict, the light path is simple, the atmospheric wind field detection can be realized under a simple and stable system, the stability of laser emission energy is improved through laser energy monitoring and laser current control, energy normalization processing is carried out on data, and the accuracy of an inversion result is improved.
The technical solution of the utility model is that: a dual-beam laser radar wind field detection device comprises a first laser transmitting and receiving mechanism, a second laser transmitting and receiving mechanism, a master control unit, an acquisition processing unit and an operation display unit; the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism have the same structure and are arranged on the same plane, and laser beams emitted by the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism are also on the same plane; the distance between the laser emitting position of the first laser emitting and receiving mechanism and the laser emitting position of the second laser emitting and receiving mechanism is a, and the included angle between the laser emitting optical axis of the first laser emitting and receiving mechanism and the laser emitting optical axis of the second laser emitting and receiving mechanism is theta; the master control unit controls the lasers and the detectors of the two laser transmitting and receiving mechanisms and the acquisition processing unit to act according to time sequence, the acquisition processing unit is responsible for acquiring and processing the signals of the detectors of the two laser transmitting and receiving mechanisms, and the operation display unit is responsible for command input and result display.
Furthermore, the first laser transmitting and receiving mechanism is the same as the second laser transmitting and receiving mechanism and comprises a laser energy monitoring unit, a current control unit, a laser, a beam expanding mirror, a total reflection mirror, a partial reflection mirror, a primary mirror, a secondary mirror, a telescope cone, a diaphragm, an optical filter and a detector; the primary mirror and the secondary mirror are arranged on the telescope tube; laser emitted by the laser enters the atmosphere after passing through the beam expander, the partial reflector and the total reflector, and generates a scattering effect after encountering aerosol particles and atmospheric molecules in the atmosphere; the backscattering signal of the laser is reflected by the primary mirror and the secondary mirror, and then enters the detector after passing through the diaphragm and the optical filter; when laser emitted by the laser passes through the partial reflector, the transmitted laser is received by the laser energy monitoring unit and is used for monitoring emitted laser energy in real time, monitoring results are fed back to the current control unit and the acquisition processing unit, the current control unit adjusts the current of the laser in real time according to the monitoring results to realize the stability of the emitted laser energy, and the acquisition processing unit records the emitted laser energy for data processing; the optical axis of the laser emitted by the total reflection mirror is superposed with the optical axes of the primary mirror and the secondary mirror; the laser is connected with the main control unit, and the detector is connected with the main control unit and the acquisition processing unit.
Further, an included angle θ between the laser optical axis emitted by the first laser emitting and receiving mechanism and the laser optical axis emitted by the second laser emitting and receiving mechanism satisfies: 0 < theta <180 deg..
Further, the distance between the laser emitting position of the first laser emitting and receiving mechanism and the laser emitting position of the second laser emitting and receiving mechanism is a, and a satisfies the following conditions: 0m < a <1 m.
Furthermore, the laser emitting and receiving mechanism emits laser wavelength of 532nm, the repetition frequency is 2.5kHz, the laser energy is 10 muJ, the time resolution is 1s, and the spatial resolution is 3 m.
Further, the partial mirror reflectance was 95%.
Furthermore, the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism are both provided with a laser and a detector; the specific process of the master control unit controlling the lasers and the detectors of the two laser transmitting and receiving mechanisms and the acquisition processing unit to act according to the time sequence is as follows:
(1) the detector of the first laser transmitting and receiving mechanism and the detector of the second laser transmitting and receiving mechanism are powered simultaneously to start detection;
(2) the laser of the first laser transmitting and receiving mechanism and the laser of the second laser transmitting and receiving mechanism simultaneously transmit laser pulses;
(3) the laser pulse triggers the acquisition processing unit to acquire and store the monitoring value of the laser energy monitoring unit;
(4) triggering an acquisition processing unit by laser pulses to start acquiring detector signals, storing a numerical value as a channel every 20ns, and stopping after 200 mus;
(5) the laser of the first laser transmitting and receiving mechanism and the laser of the second laser transmitting and receiving mechanism simultaneously transmit the next laser pulse;
(6) the laser pulse triggers the acquisition processing unit to acquire and store the monitoring value of the laser energy monitoring unit;
(7) triggering an acquisition processing unit by a laser pulse to start acquiring a detector signal, storing a numerical value as a channel every 20ns, accumulating the numerical value with the numerical value of the channel of the previous pulse, and stopping after 200 mu s;
(8) performing circulation according to the sequence of (5) to (7), performing 2500 laser pulses, namely after 1s, ending the acquisition of the group, and starting the acquisition of the next group;
(9) and (4) circularly performing according to the sequence of (2) to (8), stopping light emission of the laser of the first laser transmitting and receiving mechanism and the laser of the second laser transmitting and receiving mechanism after working for a set time, and powering off the detector of the first laser transmitting and receiving mechanism and the detector of the second laser transmitting and receiving mechanism.
Compared with the prior art, the utility model the advantage lie in:
(1) the utility model discloses the wind speed is come back to the fluctuation of echo signal intensity that causes based on the inhomogeneous structure of aerosol, and is not high to the requirement of light source coherence, and the spectral width restriction is also not strict, and device simple structure, stability are strong;
(2) the dual-beam laser radar wind field detection device has the functions of laser energy monitoring and laser feedback current control, can ensure the energy stability of the laser, and improves the accuracy of the inversion result of the wind field;
(3) during inversion calculation, the monitored laser energy value is used for carrying out normalization processing on the echo signal, and the influence of laser energy fluctuation on the wind field inversion result is further eliminated.
Drawings
Fig. 1 is the utility model discloses a dual-beam laser radar wind field detection device block diagram.
Detailed Description
The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work belong to the protection scope of the present invention based on the embodiments of the present invention.
As shown in fig. 1, the utility model discloses a dual beam laser radar wind field detection device, include: the system comprises a first laser transmitting and receiving mechanism, a second laser transmitting and receiving mechanism, a master control unit, an acquisition processing unit and an operation display unit; the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism have the same structure and are arranged on the same plane, and laser beams emitted by the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism are also on the same plane; the distance between the laser emitting position of the first laser emitting and receiving mechanism and the laser emitting position of the second laser emitting and receiving mechanism is a, and the included angle between the laser emitting optical axis of the first laser emitting and receiving mechanism and the laser emitting optical axis of the second laser emitting and receiving mechanism is theta; the master control unit controls the lasers and the detectors of the two laser transmitting and receiving mechanisms and the acquisition processing unit to act according to time sequence, the acquisition processing unit is responsible for acquiring and processing the signals of the detectors of the two laser transmitting and receiving mechanisms, and the operation display unit is responsible for command input and result display.
The first laser transmitting and receiving mechanism is the same as the second laser transmitting and receiving mechanism and comprises a laser energy monitoring unit, a current control unit, a laser, a beam expanding lens, a total reflector, a partial reflector, a primary mirror, a secondary mirror, a telescope cone, a diaphragm, an optical filter and a detector; the primary mirror and the secondary mirror are arranged on the telescope tube; laser emitted by the laser enters the atmosphere after passing through the beam expander, the partial reflector and the total reflector, and generates a scattering effect after encountering aerosol particles and atmospheric molecules in the atmosphere; the backscattering signal of the laser is reflected by the primary mirror and the secondary mirror, and then enters the detector after passing through the diaphragm and the optical filter; when laser emitted by the laser passes through the partial reflector, the transmitted laser is received by the laser energy monitoring unit and is used for monitoring emitted laser energy in real time, monitoring results are fed back to the current control unit and the acquisition processing unit, the current control unit adjusts the current of the laser in real time according to the monitoring results to realize the stability of the emitted laser energy, and the acquisition processing unit records the emitted laser energy for data processing; the optical axis of the laser emitted by the total reflection mirror is superposed with the optical axes of the primary mirror and the secondary mirror; the laser is connected with the main control unit, and the detector is connected with the main control unit and the acquisition processing unit.
The laser emitting and receiving mechanism has the emitting laser wavelength of 532nm, the repetition frequency of 2.5kHz, the laser energy of 10 mu J, the time resolution of 1s and the spatial resolution of 3 m.
The specific process of the master control unit controlling the lasers and the detectors of the two laser transmitting and receiving mechanisms and the acquisition processing unit to act according to the time sequence is as follows:
(1) the detector of the first laser transmitting and receiving mechanism and the detector of the second laser transmitting and receiving mechanism are powered simultaneously to start detection;
(2) the laser of the first laser transmitting and receiving mechanism and the laser of the second laser transmitting and receiving mechanism simultaneously transmit laser pulses;
(3) the laser pulse triggers the acquisition processing unit to acquire and store the monitoring value of the laser energy monitoring unit;
(4) triggering an acquisition processing unit by laser pulses to start acquiring detector signals, storing a numerical value as a channel every 20ns, and stopping after 200 mus;
(5) the laser of the first laser transmitting and receiving mechanism and the laser of the second laser transmitting and receiving mechanism simultaneously transmit the next laser pulse;
(6) the laser pulse triggers the acquisition processing unit to acquire and store the monitoring value of the laser energy monitoring unit;
(7) triggering an acquisition processing unit by a laser pulse to start acquiring a detector signal, storing a numerical value as a channel every 20ns, accumulating the numerical value with the numerical value of the channel of the previous pulse, and stopping after 200 mu s;
(8) performing circulation according to the sequence of (5) to (7), performing 2500 laser pulses, namely after 1s, ending the acquisition of the group, and starting the acquisition of the next group;
(9) and (4) circularly performing according to the sequence of (2) to (8), stopping light emission of the laser of the first laser transmitting and receiving mechanism and the laser of the second laser transmitting and receiving mechanism after working for a set time, and powering off the detector of the first laser transmitting and receiving mechanism and the detector of the second laser transmitting and receiving mechanism.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many changes and modifications may be made thereto without departing from the principles and implementations of the invention, the scope of which is therefore defined by the appended claims.
Claims (4)
1. The utility model provides a dual beam laser radar wind field detection device which characterized in that: the system comprises a first laser transmitting and receiving mechanism, a second laser transmitting and receiving mechanism, a master control unit, an acquisition processing unit and an operation display unit; the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism have the same structure and are arranged on the same plane, and laser beams transmitted by the first laser transmitting and receiving mechanism and the second laser transmitting and receiving mechanism are also on the same plane; the distance between the laser emitting position of the first laser emitting and receiving mechanism and the laser emitting position of the second laser emitting and receiving mechanism is a, and the included angle between the optical axis of the laser beam emitted by the first laser emitting and receiving mechanism and the optical axis of the laser beam emitted by the second laser emitting and receiving mechanism is theta; the master control unit controls the lasers and the detectors of the two laser transmitting and receiving mechanisms and the acquisition processing unit to act according to time sequence, the acquisition processing unit is responsible for acquiring and processing the signals of the detectors of the two laser transmitting and receiving mechanisms, and the operation display unit is responsible for carrying out command operation and result display.
2. The dual-beam lidar wind field detection device of claim 1, wherein:
the first laser transmitting and receiving mechanism is the same as the second laser transmitting and receiving mechanism and comprises a laser energy monitoring unit, a current control unit, a laser, a beam expanding lens, a total reflector, a partial reflector, a primary mirror, a secondary mirror, a telescope cone, a diaphragm, an optical filter and a detector; wherein the primary mirror and the secondary mirror are arranged on the telescope tube; laser emitted by the laser enters the atmosphere after passing through the beam expander, the partial reflector and the total reflector, and generates a scattering effect after encountering aerosol particles and atmospheric molecules in the atmosphere; the backscattering signal of the laser is reflected by the primary mirror and the secondary mirror, and then enters the detector after passing through the diaphragm and the optical filter; when laser emitted by the laser passes through the partial reflector, the transmitted laser is received by the laser energy monitoring unit and is used for monitoring emitted laser energy in real time, monitoring results are fed back to the current control unit and the acquisition processing unit, the current control unit adjusts the current of the laser in real time according to the monitoring results to realize the stability of the emitted laser energy, and the acquisition processing unit records the emitted laser energy for data processing; the optical axis of the laser emitted by the total reflection mirror is superposed with the optical axes of the primary mirror and the secondary mirror; the laser is connected with the main control unit, and the detector is connected with the main control unit and the acquisition processing unit.
3. The dual-beam lidar wind field detection device of claim 1, wherein: the included angle theta between the laser optical axis emitted by the first laser emission receiving mechanism and the laser optical axis emitted by the second laser emission receiving mechanism meets the following requirements: 0 degrees < theta <180 degrees, and the distance a between the laser emission position of the first laser emission receiving mechanism and the laser emission position of the second laser emission receiving mechanism satisfies the following conditions: 0m < a <1 m.
4. The dual-beam lidar wind field detection device of claim 1, wherein:
the laser emitting and receiving mechanism has the emitting laser wavelength of 532nm, the repetition frequency of 2.5kHz, the laser energy of 10 mu J, the time resolution of 1s and the spatial resolution of 3 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023027149.9U CN214151058U (en) | 2020-12-16 | 2020-12-16 | Dual-beam laser radar wind field detection device |
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| CN202023027149.9U CN214151058U (en) | 2020-12-16 | 2020-12-16 | Dual-beam laser radar wind field detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114706099A (en) * | 2022-06-07 | 2022-07-05 | 成都凯天电子股份有限公司 | Laser wind finding radar optical module and measuring method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114706099A (en) * | 2022-06-07 | 2022-07-05 | 成都凯天电子股份有限公司 | Laser wind finding radar optical module and measuring method thereof |
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