A lidar system to measure atmospheric temperature and water vapor and aerosols
A technology of lidar and atmospheric temperature, which is applied in the direction of radio wave measurement system, measurement device, color/spectral characteristic measurement, etc., can solve the complex structure of the spectroscopic system, the difficulty of fully suppressing mutual interference by interference filters, and the limited effect of elastic signal suppression and other problems, to achieve the effect of simple light-splitting structure, good application value and prospect
Active Publication Date: 2020-06-09
WUHAN UNIV
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[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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[0021] The present invention will be further described below in conjunction with accompanying drawing.
[0022] The key of the present invention is to use the triple frequency laser (354.7nm) of the seed-injected ND:YAG solid-state laser as the emitted light, and to use the spectroscope, interference filter and grating spectroscopic technology to simultaneously collect the elastic scattering in the atmospheric scattering echo Signal 354.7nm, N 2 and O 2 Stokes pure rotational Raman spectrum (center wavelengths are 355.6nm and 356.2nm respectively) and anti-Stokes pure rotational Raman spectrum (center wavelengths are 353.5nm and 354.1nm respectively), N 2 The vibration rotation Raman spectrum of 386.7nm and H 2 The vibrational Raman spectrum of O is 407.6nm, which can realize the high time resolution measurement of atmospheric aerosol, temperature and water vapor.
[0023] The laser radar system of the present invention is composed of three parts, that is, a transmitting un...
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Abstract
The invention discloses a laser radar system for measuring atmospheric temperature, water vapor and aerosol. It consists of a transmitting unit, an optical receiving and splitting unit, and a data acquisition and control unit. The transmitting unit uses 354.7nm laser output from a solid-state laser and is guided to the zenith by a 45-degree refracting mirror; the optical receiving and splitting unit is composed of a 450mm effective aperture Cassegrain telescope, beam splitter, filter, lens, optical fiber and grating. . Used to collect backscattered light from atmospheric substances and combine the elastic signal (354.7nm) in the echo signal and the pure rotational Raman spectrum of atmospheric molecules (center wavelengths are 353.5nm, 354.1nm, 355.6nm and 356.2nm respectively ) and vibrational Raman spectrum (386.7nm, 407.6nm) signals are separated; the data acquisition and control unit ensures that the entire radar system works in an orderly manner. The invention can simultaneously measure parameters such as atmospheric temperature, water vapor and aerosol with high spatial and temporal resolution.
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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IPC IPC(8): G01S17/95G01N21/39
CPCG01N21/39G01S17/95G01N2201/061Y02A90/10
Inventor 易帆余长明张云鹏柳付超何裕金翁淼
Owner WUHAN UNIV