Temperature measurement laser radar system based on pure rotation Raman spectral line full extraction and detection method

Abstract

The invention discloses a temperature measurement laser radar system based on pure rotation Raman spectral line full extraction and a detection method. The system comprises a laser emission unit, a subsequent optical receiving unit and a signal acquisition and control unit. The laser emission unit is composed of a high repetition frequency semiconductor laser and a beam expander. The industrial personal computer controls the laser to emit light; laser is expanded by the beam expander, reflected by three reflectors, penetrates through the window glass and then is emitted to the atmosphere, backward scattered light of the rotating Raman separation spectral line generated by the laser beam and N2 molecules is received by the subsequent light path receiving unit after being attenuated by the atmosphere, and data acquisition and storage are carried out by a signal acquisition and control unit. The full extraction of the N2 molecular spectral lines is realized through the combination of thedouble-grating spectrum and the broadband optical filter and the adoption of the linear array photomultiplier for receiving, the optimal combination of different pure rotation Raman spectral lines isrealized and the high-precision measurement of the temperature profile is realized.

Description

technical field [0001] The invention relates to a meteorological optical telemetry system, in particular to a laser radar system for high-precision temperature profile measurement. Background technique [0002] Atmospheric temperature is one of the basic parameters that characterize the energy balance of the atmosphere. High-precision detection of the temporal and spatial variation of atmospheric temperature has important application value and scientific research value. Traditional radiosondes are a common means of vertical distribution of atmospheric temperature. However, the time resolution of radiosonde measurement data is poor. Many stations only have data twice a day, morning and evening. Microwave radiation remote sensing uses the absorption band of oxygen in the atmosphere to invert the atmospheric temperature distribution. The microwave wavelength is longer, the penetrating ability is strong, and it is almost not disturbed by weather conditions. However, its inversio...

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Problems solved by technology

The traditional radiosonde is a common method for the vertical distribution of atmospheric temperature. However, the time resolution of the radiosonde measurement data is poor. Many stations only have data twice a day, morning and evening.

Microwave radiation remote sensing uses the absorption band of oxygen in the atmosphere to invert the atmospheric temperature distribution. The microwave wavelength is longer, the penetrating ability is strong, and it is almost not disturbed by weather conditions. However, its inversion requires local long-term sounding data to be corrected, and the vertical resolution poor rate

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