Doppler calibration method for portable wind lidar

A technology of wind measurement lidar and calibration method, applied in the field of Doppler calibration, can solve the problems of low accuracy, large measurement error, small calibration speed range, etc., to meet calibration requirements, good equivalence, and high precision Effect

Inactive Publication Date: 2006-07-19
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The usual way to verify the correctness of various wind lidar measurements is to compare with the results measured by other wind measurement methods. Due to the large measurement errors of various methods, the purpose of calibration cannot be achieved
The calibration method that has been reported so far is the hard target calibration method, but it is only a temporary optical path for rough calibration, and the accuracy is not high
[0004] According to most reports: the hard target moving along the

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  • Doppler calibration method for portable wind lidar
  • Doppler calibration method for portable wind lidar
  • Doppler calibration method for portable wind lidar

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Embodiment Construction

[0015] See attached picture.

[0016] Doppler calibration method of portable wind-measuring lidar. Nd:YAG laser is used in the wind-measuring lidar system to be calibrated. After the laser emits pulsed light, the laser pulse is coupled to the / 95 1×2 type fused fiber coupler 1 input. Experiments have found that the two input ends of the fused fiber coupler 1 have strong crosstalk signals, so the crosstalk signal at the other input end can be used as a reference light. The output light of the aforementioned optical fiber coupler is output by the optical fiber collimator after passing through the optical fiber delayer. The exiting light shines on the edge of the turntable after passing through the exit diaphragm. The turntable is driven by a motor whose rotation causes a Doppler shift in the scattered light. Part of the scattered signal is received by the fiber coupling mirror 2 after passing through the receiving aperture. The reference light generated from the other input ...

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Abstract

The invention discloses a portable wind gauging laser radar Doppler adjusting method which is characterized in that it arranges a Nd:YAG laser; the impulse light sent by the laser incidents into the rim of the illuminating rotation disk through the collimating mirror and the exiting aperture after weakening and delaying; the rotating of the rotation disk makes the brand light at rotation disk rim to generate Doppler frequency shift; the brand light with Doppler frequency shift signal is transmitted by another optic fiber after the receiving drive plate; the other input end of the melting optical fiber coupler generates crossfire signal as reference light which is coupled with the reflecting light with Doppler frequency shift signal by another optical fiber coupler after adjustable attenuator and achieves to wind gauging laser radar receiver to do signal analyzing and processing.

Description

technical field [0001] The invention belongs to the field of laser radar, in particular to a Doppler calibration method of wind measuring laser radar. Background technique [0002] Doppler calibration of wind lidar is an important unit of Doppler wind lidar. According to the research results at home and abroad, the Doppler calibration instrument for wind lidar is still blank, and there is no practical and reliable instrument for Doppler calibration of the wind lidar system itself. [0003] The usual way to verify the correctness of various wind lidar measurements is to compare with the results measured by other wind measurement methods. Due to the large measurement errors of various methods, the purpose of calibration cannot be achieved. The calibration method that has been reported so far is the hard target calibration method, but it is only a temporary optical path for rough calibration, and the accuracy is not high. [0004] According to most reports: the hard target mo...

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Application Information

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IPC IPC(8): G01S7/497G01S17/50
Inventor 孙东松夏海云董晶晶周军
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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