Calibrating apparatus for Rayleight windfinding laser radar and calibrating method thereof

A wind-measuring lidar and calibration device technology, applied in measurement devices, utilizing re-radiation, electromagnetic wave re-radiation and other directions, can solve the problem of not finding the Rayleigh wind-measuring lidar calibration method, etc., and achieve rapid calibration and calibration accuracy High, improve the effect of accuracy

Inactive Publication Date: 2008-01-30
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

The above reasons indicate that the calibration method of CNRS has certain defects. In addition to NASA and CNRS, we have also investigated the data of other laser research institutions, and found no good calibration of Rayleigh wind lidar method

Method used

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  • Calibrating apparatus for Rayleight windfinding laser radar and calibrating method thereof
  • Calibrating apparatus for Rayleight windfinding laser radar and calibrating method thereof

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0037] First please refer to Fig. 1, as can be seen from the figure, the Rayleigh wind lidar calibration device of the present invention includes a laser 1, along the laser output optical path of the laser 1, the first reflector 2, the attenuator 3, the second reflector 4. The first acousto-optic frequency shifter 5, the second acousto-optic frequency shifter 6 and the Doppler stretcher 7 are composed, and the output end of the Doppler stretcher 7 is connected with the Rayleigh wind measurement through the signal collection optical fiber 8 The receiving part 9 of the lidar is connected.

[0038] The laser 1 is a laser with a laser wavelength of 355nm.

[0039] The center frequency of the first acousto-optic frequency shifter 5 is 400MHz, the frequency adjustable range is 4...

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Abstract

The invented Rayleigh windfinding laser radar calibration method uses acoustooptic frequency shift and laser spectrum Doppler broadening principle as basis, and utilizes two acoustooptic frequency shifters whose frequency can be regulated, and makes them be series-connected to implement laser frequency zero-crossed wideband continuous regulation, and utilizes Doppler stretcher to stretch spectrum so as to make accurate and quick calibration of Rayleigh windfinding radar.

Description

technical field [0001] The invention relates to a laser radar, in particular to a calibration device and a calibration method of a Rayleigh wind laser radar. Background technique [0002] The global atmospheric wind field plays an extremely important role in atmospheric dynamics, weather, and meteorology. It is the main driving force for water vapor, aerosol, carbon cycle, and sea-air exchange; it is indispensable in weather numerical forecasting, transmission research, and dynamic meteorology research. few parameters. Doppler lidar wind measurement is a powerful means of wind speed measurement at present. Its principle is as follows: Generally speaking, the moving speed of atmospheric molecules can be considered to be equal to the wind speed. Due to the Le effect, the laser frequency will change, and there is Δv=2V / λ, where Δv is the change in laser frequency, V is the moving speed of atmospheric molecules, and λ is the wavelength of the outgoing laser. It can be seen fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/95
CPCY02A90/10
Inventor 卜令兵陈卫标刘继桥
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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