Rayleigh Doppler anemometry laser radar based on wide spectrum gated coherent detection

A technology of Doppler wind measurement and lidar, which is applied in the field of Rayleigh Doppler wind measurement lidar, can solve problems such as limiting the application of Doppler wind measurement lidar, achieve signal detection error removal, prevent saturation, and improve sensitivity Effect

Active Publication Date: 2017-06-23
江苏光在科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above shortcomings limit the application of coherent Doppler wind lidar in the field of molecular Rayleigh scattering signal detection

Method used

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  • Rayleigh Doppler anemometry laser radar based on wide spectrum gated coherent detection
  • Rayleigh Doppler anemometry laser radar based on wide spectrum gated coherent detection
  • Rayleigh Doppler anemometry laser radar based on wide spectrum gated coherent detection

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Embodiment 1

[0041] figure 2 It is a structural block diagram of the Rayleigh Doppler wind lidar based on wide-spectrum gating coherent detection provided by the present invention, such as figure 2 As shown, it includes: continuous wave laser 1, fiber beam splitter 2, optical modulator 3, laser amplifier 4, fiber optic circulator 5, telescope 6, mixer 7, photodetector 8, bandpass filter 9, front A preamplifier 10, a power divider 11, an adjustable bandpass filter 12, a multi-channel acquisition card 13 and a digital signal processing module 14.

[0042] The continuous wave laser 1 is used to output continuous light as seed light. In an optional embodiment, the continuous wave laser is a fiber laser, and the fiber laser has the advantages of small size and light weight.

[0043] The output end of the continuous wave laser 1 is connected to the optical entrance of the optical fiber splitter 2, and the optical fiber splitter 2 divides the input optical signal into signal light and local o...

Embodiment 2

[0085] Such as Figure 5 As shown, the present invention also provides a Rayleigh Doppler wind lidar based on wide-spectrum gating coherent detection, including: a continuous wave laser 1, a beam splitter, an optical modulator 3, a laser amplifier 4, a circulator, Telescope 6, mixer 7, photodetector 8, bandpass filter 9, preamplifier 10, power divider 11, adjustable bandpass filter 12, multi-channel acquisition card 13 and digital signal processing module 14; Wherein ,

[0086] The optical signal output by the continuous wave laser 1 is divided into signal light and local oscillator light after being passed through the beam splitter. After the signal light is input to the optical modulator 3 for modulation, it is input to the laser amplifier 4, and the laser amplifier 4 amplifies the input optical signal and outputs it to the The input end of the circulator, the transceiver end of the circulator is connected to the telescope 6, and the optical signal output from the output en...

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Abstract

The present invention discloses a Rayleigh Doppler anemometry laser radar based on wide spectrum gated coherent detection. A band pass filter is used to filter an aerosol mie scattering signal in echo signal current, and a preamplifier is used to amplify a molecular Rayleigh scattering signal. An adjustable band pass filter is used to carry out scan filtering on the amplified Rayleigh signal in a range, and an electric scanning frequency discriminator structure is realized. According to the Rayleigh Doppler anemometry laser radar, the advantages of an amplification effect of a weak signal and a high detection complexity are used in the coherent detection, and the advantage of a small data processing calculation quantity in using a frequency discriminator to discriminate an echo signal in direction detection is used. A problem that a traditional coherent anemometry laser radar can not detect a molecular wide spectrum Rayleigh signal is solved, and the application of a coherent Doppler anemometry laser radar in temperature measurement and high altitude sounding is realized.

Description

technical field [0001] The present invention relates to the technical field of laser radar, in particular to a Rayleigh Doppler wind-measuring laser radar based on wide-spectrum gating coherent detection. Background technique [0002] The active observation of the global wind field is called one of the most meaningful and challenging meteorological observations by the World Meteorological Organization. In the detection of atmospheric wind field, the commonly used means are weather balloons, sonar detectors, microwave wind radar, wind lidar and so on. As a popular active atmospheric remote sensing method, lidar has the advantages of small size, high measurement accuracy, and high time and space resolution. It is very suitable for actual combat applications that require fast measurement speed, high mobility, and good concealment. Wind lidar is divided into direct detection wind lidar and coherent detection wind lidar. The direct detection wind measurement lidar uses an optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 张仁俊赵自豪
Owner 江苏光在科技有限公司
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