Vibrating Raman lidar scattered light processing system and processing method

Abstract

The invention provides a vibration Raman laser radar scattering optical processing system based on a narrow bandpass filter and a reflex prism, and a processing method thereof. Aiming at two problems of a wide dynamic range of laser radar signal intensity and strong noise signal relative to a Raman scattering signal, the method and the system divide back scattering light into a high channel and a low channel for detecting and sufficiently utilize the narrow bandpass filter to improve the accuracy of temperature measurement and enlarge the range of the temperature measurement. An upper noise signal is relative weak, and can be fed into a photoelectric detection system for detecting through the narrow bandpass filter for once; and a lower noise signal is strong, the back scattering light of atmosphere passes through the same optical filter for twice by special optical technology, and spectrum of total transmittance is equivalent to squared spectrum of single transmittance so as to furthest suppress photonoise. After elastic scattering and background light of emission wavelength are compressed, under the condition of a multiplier tube is unsaturated, the echo intensity of the Raman scattering signal can be improved by increasing single pulse energy of emission laser, thereby achieving the aims of improving the accuracy of the temperature measurement and enlarging the range of the temperature measurement.

Description

technical field [0001] The present invention designs a vibrating Raman laser radar scattered light processing system and its processing method, through designing the optical path to separately process the back scattered light received by the Raman laser radar system, wherein the high altitude directly processes the signal passing through the narrowband filter For detection, the low-altitude channel makes the atmospheric backscatter signal pass through the narrow-band filter twice to further compress the noise in the Raman lidar system, which can improve the system signal-to-noise ratio. In the process of detecting atmospheric temperature profile information, the invention solves the two problems of large dynamic range of laser radar signals and low-altitude Raman scattering signals being affected by elastic scattering signals. Background technique [0002] Atmospheric temperature profiles have important applications in many research fields. In terms of climatological resear...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to solve the problem of the large dynamic range of the laser radar signal by dividing the high-altitude and low-altitude channels for detection, and design an optical path for the low-altitude channel so that the optical signal passes through the filter twice, further compressing the background noise and elasticity Scattering noise, improving the signal-to-noise ratio of the system, thereby improving the accuracy of Raman lidar temperature measurement and expanding the temperature measurement range

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