Laser frequency spectrum retrieval method and measurement calibration method for molecular scattering anemometry laser radar

A wind-measuring lidar, molecular scattering technology, applied in measurement devices, radio wave measurement systems, and re-radiation, etc., can solve problems such as difficulty in laser spectrum calibration

Active Publication Date: 2014-03-12
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0011] An object of the present invention is to provide a method for directly detecting the Rayleigh wind lidar spectru

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  • Laser frequency spectrum retrieval method and measurement calibration method for molecular scattering anemometry laser radar
  • Laser frequency spectrum retrieval method and measurement calibration method for molecular scattering anemometry laser radar
  • Laser frequency spectrum retrieval method and measurement calibration method for molecular scattering anemometry laser radar

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[0045] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] The present invention selects all optical fiber devices to build the optical path. The atmospheric molecule scattering channel is a sealed aluminum cylindrical channel with a diameter of 0.5m and a length of 60m, and the inside is sealed with pure air.

[0047] The invention selects a self-tailored fiber optic coupling mirror, a fiber beam splitter mirror and a fiber collimating mirror matched with the multimode fiber.

[0048] See figure 1 , figure 1 The present invention provides a structural schematic diagram of the calibrating system components of the etalon transmittance curve in direct detection of Rayleigh wind lidar, and the calibrating system includes: laser 1, narrow-band filter 2, integrating sphere 3, first an...

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Abstract

The invention discloses a laser frequency spectrum retrieval method and a measurement calibration method for a molecular scattering anemometry laser radar and solves the problem that the existing anemometry Rayleigh laser radar is difficult in laser spectrum calibration. The retrieval method includes: allowing the molecular scattering light to perform convolution operation through an etalon transmittance function Ni(v) and an etalon transmittance function Fei(v), allowing the operation result to perform convolution operation with Rayleigh-Brillouin spectrum FR-B(v) to obtain the laser spectrum Fl(v), and fitting with the Gaussian function to obtain the laser spectrum function. The measurement calibration method and system is provided with an etalon controller for changing the cavity length of an etalon, the laser beams entering the etalon scan the cavity length of the etalon to obtain the etalon and molecular scattering light transmittance curve. By the method, accuracy, reliability and precision of wind retrieval are increased.

Description

technical field [0001] The present invention relates to the technical field of laser atmospheric remote sensing, and relates to technologies such as laser atmospheric remote sensing, laser radar, molecular scattering wind detection laser radar, and frequency inversion, and specifically relates to a laser spectrum inversion method and measurement calibration in molecular scattering wind measurement laser radar method. Molecular scattering, also known as Rayleigh scattering, is Rayleigh scattering. Background technique [0002] Since the early 1980s, direct detection Rayleigh lidar has been widely used to detect the wind field in the middle and upper atmosphere. The aerosol content in the middle and upper atmosphere is relatively low, so the aerosol backscattering signal is compared with the atmospheric molecule backscattering signal. It can be ignored, the direct detection of Rayleigh lidar is to detect the wind field in the middle and upper atmosphere by detecting the backs...

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Application Information

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IPC IPC(8): G01S17/95G01S7/497
CPCG01S7/497G01S17/95Y02A90/10
Inventor 韩燕窦贤康孙东松夏海云舒志峰薛向辉陈廷娣
Owner UNIV OF SCI & TECH OF CHINA
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