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All-fiber wind measurement laser radar based on 1 mu m-2 mu m gas molecular absorption line

A technology for measuring wind lidar and gas molecules, which is applied in radio wave measurement systems, measuring devices, climate sustainability, etc., can solve the problems of no wind measuring lidar, achieve relative safety for human eyes, high detection accuracy, and improve Effect of Fit Accuracy

Active Publication Date: 2015-12-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no wind detection lidar based on the near-infrared absorption spectrum of 1μm~2μm gas molecules

Method used

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  • All-fiber wind measurement laser radar based on 1 mu m-2 mu m gas molecular absorption line
  • All-fiber wind measurement laser radar based on 1 mu m-2 mu m gas molecular absorption line
  • All-fiber wind measurement laser radar based on 1 mu m-2 mu m gas molecular absorption line

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Embodiment

[0029] figure 1 A schematic diagram of an all-fiber wind-measuring lidar based on 1 μm-2 μm gas molecule absorption lines provided by an embodiment of the present invention. Such as figure 1 As shown, it mainly includes:

[0030] Continuous laser 1, fiber isolator 2, intensity modulator 3, arbitrary function generator 4, fiber amplifier 5, fiber circulator 6, time-delay fiber 7, optical transceiver and scanning system 8, fiber Bragg grating 9, fiber beam splitter 10. Frequency discriminator 11, first detector 12, first acquisition card 13, second detector 14, second acquisition card 15 and computer 16 based on the absorption spectrum of gas molecules, wherein the connection relationship of each device is:

[0031] The output end of the continuous laser 1 is connected to the input end of the fiber isolator 2, the output end of the fiber isolator 2 is connected to the input end of the intensity modulator 3, the output end of the intensity modulator 3 is connected to the input ...

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Abstract

The invention discloses an all-fiber wind measurement laser radar based on a 1 mu m-2 mu m gas molecular absorption line, which locks emitted laser on the cliffy edge of a molecular absorption line, and measures doppler frequency shift through detecting the energy change of atmosphere echo signals on the molecular absorption line. The all-fiber wind measurement laser radar packages 1 mu m-2 mu m gas molecules in crystal fibers under constant temperature and constant voltage conditions, and realizes a doppler wind measurement radar all-fiber receiving light path based on gas molecular absorption line frequency discrimination. Meanwhile, the all-fiber wind measurement laser radar employs a Galatry function to fit a gas molecular absorption line, and improves the precision of the gas molecular absorption line as a wind measurement benchmark compared with a Voigt function. The all-fiber wind measurement laser radar has the advantages of stable frequency spectrum characteristic, easy satisfied optical path collimating condition, compact structure, stable system, and high detection precision, and is relatively safe for human eyes.

Description

technical field [0001] The invention relates to the technical field of Doppler wind-measuring lidar, in particular to an all-fiber wind-measuring lidar based on 1 μm-2 μm gas molecule absorption lines. Background technique [0002] Wind lidar is of great significance to improve the accuracy of long-term weather forecasts, improve climate research models, and improve military environment forecasts. Therefore, the measurement of atmospheric wind field has received more and more attention. Organizations such as the International Civil Aviation Agency, the World Meteorological Organization, and aerospace research institutions in various countries are actively carrying out research and development of wind field detection systems. [0003] Doppler wind lidar can be divided into coherent detection and direct detection according to different detection principles. Coherent detection detects wind speed detection by means of coherent laser atmospheric echo signal and local oscillator ...

Claims

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Application Information

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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 夏海云上官明佳窦贤康薛向辉
Owner UNIV OF SCI & TECH OF CHINA
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