Laser radar system for measuring atmospheric temperature, steam and aerosol

Abstract

The invention discloses a laser radar system for measuring atmospheric temperature, steam and aerosol. The laser radar system is composed of a transmitting unit, an optical receiving and light splitting unit and a data acquisition and control unit. The transmitting unit utilizes 354.7nm laser which is output from a solid laser and guides the laser to zenith through a 45-DEG reflector. The optical receiving and light splitting unit is composed of a Cassegrain telescope with an effective aperture of 450mm, a spectroscope, an optical filter, a lens, an optical fiber, a grating, etc. The optical receiving and light splitting unit is used for collecting backward diffused light from atmosphere substances and separates an elastic signal (354.7nm), signals of pure rotation Raman spectrums (with central wavelengths of 353.5nm, 354.1nm, 355.6nm and 356.2nm) of atmosphere modules, and signals of vibrational / rotational Raman spectrums (with central wavelengths of 386.7nm and 407.6nm). The data acquisition and control unit ensures ordered operation of the whole radar system. The laser radar system can simultaneously perform high-temporal-spatial-resolution measurement on the atmospheric temperature, the steam and the aerosol.

Description

technical field [0001] The invention relates to a laser radar system for measuring atmospheric temperature and water vapor and aerosol. Background technique [0002] The phenomena and processes in the atmosphere are so intricate that the research of atmospheric science depends largely on the detection of atmospheric phenomena and processes. Atmospheric temperature, water vapor and aerosols are important parameters in atmospheric research. [0003] Lidar is widely used in the remote sensing detection of the atmosphere, ocean, land and other targets because of its high spatio-temporal resolution, high detection sensitivity and continuous detection. It is especially suitable for the detection of atmospheric parameters. LiDAR measurement technology is mainly based on the interaction mechanism of light and matter. Specifically, there are elastic scattering, molecular vibrational Raman, molecular pure rotational Raman, resonance fluorescence, and differential absorption techniqu...

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Problems solved by technology

[0006] For the spectroscopic system composed of interference filters, the structure is simple and the system is stable, but for pure rotational Raman temperature measurement, it is difficult for the interference filters to fully suppress the mutual interference between the two wavelengths, and the suppression effect on the elastic signal is limited.

The spectroscopic system composed of interference filter and Fabry-Perot etalon usually has a complex structure, and is rarely used in ultraviolet laser spectroscopic

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