High-altitude air Rayleigh scattering wind-warm syndrome laser radar

A Rayleigh scattering and laser detection technology, applied in the field of laser radar, can solve the problems of not being able to detect the atmospheric wind field, affecting the sensitivity of frequency discrimination, and affecting the detection accuracy, etc., to achieve stable wavelength without drift, small detection error, and improve signal-to-noise ratio Effect

Active Publication Date: 2010-07-28
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] The double-edge frequency discrimination technology of F-P etalon (document "Research on Rayleigh Scattering Wind Lidar Receiver" Infrared and Laser Engineering, 2008, Volume 37, Supplement, Page 120-124) is to combine two F-P etalons The transmission peaks are respectively set at the two edges of the Rayleigh scattering echo spectrum. Because the echo spectrum will shift left and right due to the change of wind speed, the light intensity passing through the two F-P etalons will change. According to the two F-P standard The wind direction and wind speed can be determined by the light intensity difference of the tool. This technology has high frequency discrimination sensitivity, but the F-P etalon is expensive and sensitive to temperature and mechanical vibration. The frequency discrimination error caused by environmental changes is large, which affects the Detection accuracy
[0005] Iodine molecular absorption edge frequency discrimination technology (document "Comparison of hyperspectral iodine molecule and double-edge Doppler wind lidar technology" Journal of Ocean University of China, 2004, 34(3): 489~49) i

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, the present invention will be further described.

[0038] 1. Structure

[0039] The high-altitude atmospheric Rayleigh scattering wind temperature detection laser radar is composed of a laser emitting unit 1, a receiving telescope 2, an optical fiber 3, a frequency discrimination unit 4 and a data acquisition and processing unit 5. The laser output direction of the laser emitting unit 1 and the axis of the receiving telescope 2 are placed perpendicular to the horizontal plane, the receiving end of the optical fiber 3 is located on the focus of the receiving telescope 2 and is coaxial with the receiving telescope 2, and the output end is placed on the convex lens 44 of the frequency discrimination unit 4 At the focal point and coaxial with the convex lens 44, the output terminals of the three photomultiplier tubes 113, 213 and 313 of the frequency discrimination unit 4 are respectively connected to the input terminals of th...

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Abstract

The invention discloses a high-altitude air Rayleigh scattering wind-warm syndrome laser radar which is used for high-altitude air sounding. The laser radar comprises a laser emitting unit (1), a receiving telescope (2), an optical fiber (3), a frequency discrimination unit (4) and a data acquiring and processing unit (5), wherein output frequency of emitting laser adopts atomic absorption for frequency stabilization; and the frequency discrimination unit can adopt three channels of the same atom for frequency discrimination, respectively obtains strengths of full spectrum, left edge spectrum and right edge spectrum of an echo spectrum, and can simultaneously obtain air density, temperature and wind field. The invention has the advantages of strong inhibition capacity of background light, high frequency discrimination precision, small detection error and stable and reliable work.

Description

Technical field: [0001] The invention relates to laser radars, in particular to high-altitude atmospheric detection laser radars. Background technique: [0002] With the extension of human activities to space, high-altitude atmospheric conditions, especially the wind field, have a greater impact on space vehicles. However, as the altitude of the atmosphere increases, the aerosols gradually decrease, the Mie scattered echo light gradually decreases, and the proportion of the Rayleigh scattered echo light produced by smaller molecules gradually increases. This not only weakens the lidar echo, but also due to the influence of the kinetic energy of molecules and atoms, the spectrum of the echo optical signal has a large spectral broadening compared with the line width of the emitted laser, which increases the difficulty of detecting the high-altitude Rayleigh scattering wind field. [0003] The literature "Research Progress of Doppler Wind LiDAR" (Journal of Atmospheric and Env...

Claims

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Application Information

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IPC IPC(8): G01S17/95G01W1/02
CPCY02A90/10
Inventor 李发泉程学武杨勇林鑫杨国韬王继红戴阳林兆祥李勇杰龚顺生
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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