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A wind measurement lidar and wind measurement method based on atmospheric molecular absorption

A lidar wind measurement and molecular absorption technology, applied in the field of laser remote sensing, can solve problems such as system errors, and achieve the effects of improving reliability, improving signal-to-noise ratio, and high energy utilization.

Active Publication Date: 2021-10-01
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, it has been proposed to use 1 μm ~ 2 μm differential absorption technology for wind speed profile detection, but when using single absorption working wavelength for wind speed measurement, it is necessary to predict the number density of tracer molecules, thus introducing systematic errors

Method used

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  • A wind measurement lidar and wind measurement method based on atmospheric molecular absorption
  • A wind measurement lidar and wind measurement method based on atmospheric molecular absorption
  • A wind measurement lidar and wind measurement method based on atmospheric molecular absorption

Examples

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Embodiment 1

[0068] In the present embodiment, suppose lidar measures the wind velocity profile below 2km, the selected atmospheric molecule is O 2 , selected O 2 The absorption line is λ 0 =769.23386nm, the non-absorbing wavelength λ closest to the absorption peak E =769.40832nm as the reference wavelength; the working wavelength λ L =769.23154nm and working wavelength λ R =769.23618nm, such as figure 2 shown;

[0069] A lidar wind measurement method based on the absorption of atmospheric molecules, such as figure 1 As shown, the steps of the method include:

[0070] (1) The laser emitting module 1 first emits to the atmosphere with a working wavelength of λ L The laser pulse is then emitted into the atmosphere with an interval of 100μs and the working wavelength is λ R The laser pulses are emitted to the atmosphere with an interval of 100μs and the working wavelength is λ E Laser pulses of three wavelengths; after entering the atmosphere, the laser pulses of three wavelengths a...

Embodiment 2

[0088] In this embodiment, assume that the lidar measures the wind speed profile below 2 km, and the selected atmospheric molecule is CO 2 , the selected CO 2 The absorption line is λ 0 =2072.63487nm, the nearest non-absorbing wavelength λ to the absorption peak E =2074.70739nm as the reference wavelength; the working wavelength λ L =2072.60334nm and working wavelength λ R = 2072.67095 nm.

[0089] A lidar wind measurement method based on atmospheric molecular absorption, the steps of the method comprising:

[0090] (1) The laser emitting module 1 emits to the atmosphere at the same time with a working wavelength of λ L , lambda R and lambda E The laser pulses of three wavelengths are simultaneously backscattered after entering the atmosphere to generate echo photons;

[0091] (2) The receiving optical module 2 collects backscattered echo photons from the atmosphere, and uses the interference filter and FP etalon to separate the collected echo photons according to the ...

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Abstract

The invention relates to a wind-measuring laser radar and a wind-measuring method based on atmospheric molecular absorption, which belongs to the technical field of laser remote sensing and can be used for detecting atmospheric wind speed profiles. The wind lidar sets two absorption working wavelengths symmetrically on both sides of the molecular absorption peak, and uses the two wavelengths of pulsed laser as the light source to construct the lidar, so as to obtain the backscattering signals of the two wavelengths at different heights profile, and then get the profile of wind speed and wind direction through inversion.

Description

technical field [0001] The invention relates to a wind-measuring laser radar and a wind-measuring method based on atmospheric molecular absorption, which belongs to the technical field of laser remote sensing and can be used for detecting atmospheric wind speed profiles. Background technique [0002] The wind speed profile in the atmosphere is of great value to meteorology, climate, environment, aviation, aerospace and other fields. Over the years, people have developed wind profile radar, coherent detection lidar, incoherent detection lidar and other equipment to obtain high-precision and high-resolution wind speed profile and wind field distribution. [0003] Among them, the wind profiler radar occupies a large area and lacks the ability to measure low-altitude wind fields, so it is difficult to be used on spaceborne. The coherent detection laser radar obtains the wind speed Doppler frequency shift and then the wind speed by analyzing the heterodyne signal between the emi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/95G01P5/26G01P13/02G01S7/481
CPCG01P5/26G01P13/025G01S7/481G01S17/95Y02A90/10
Inventor 王玉诏罗萍萍
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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