A day and night automatic detection device for differential absorption lidar ozone temporal and spatial distribution based on dual Raman tube light sources

Abstract

The invention discloses a differential absorption laser radar ozone space-time distribution day and night automatic detection device based on double Raman tube light source. The device comprises a laser transmitting unit, an optical receiving unit, a signal collecting unit and a signal analyzing unit, wherein the laser transmitting unit adopts D2 and H2 double Raman tube light source systems; the laser transmitting unit is used for transmitting laser of 266nm, 289nm, 299nm and 316nm simultaneously; the laser is received by the optical receiving unit; optical signals, which are transmitted by the optical receiving unit, are converted to digital signals through the signal collection unit, stored in an industrial personal computer and analyzed by the signal analyzing unit in real time. Echo signals of four channels are detected simultaneously; the requirements for detection precisions of different heights of a lower layer, a middle layer and a high layer of ozone in a convection layer can be taken into account. The device is capable of observing the ozone three-dimensional distribution of the convection layer around the clock, high in time resolution ratio and space resolution ratio and high in detection precision.

Description

technical field [0001] The invention relates to an optical telemetry receiving device, in particular to the combination of differential absorption laser radar and D 2 、H 2 The technology and method for the automatic and continuous monitoring of the temporal and spatial distribution of tropospheric ozone is realized by combining the dual Raman tube differential absorption light sources to establish a multi-wavelength differential absorption lidar device. Background technique [0002] Tropospheric ozone accounts for about 10% of the total atmospheric ozone. It is an important trace gas and plays an important role in tropospheric air pollution. Ozone is a strong oxidant that reacts with other chemicals to produce a variety of toxic oxides , causing great harm to human health, and ozone plays an important role in the generation of photochemical smog and haze. Tropospheric ozone has become the primary indicator of air pollution. It is of great scientific significance and applic...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a day and night automatic detection device for differential absorption lidar ozone temporal and spatial distribution based on dual Raman tube light sources, to realize high spatial and temporal resolution of tropospheric ozone temporal and spatial distribution, High-precision day and night continuous detection; based on D 2 、H 2 Double Raman tube light source, which produces four differential absorption wavelength pairs of 266nm, 289nm, 299nm, and 316nm, realizes continuous detection of ozone concentration from near the ground to the tropopause; Raman frequency shift light source has the advantages of simple equipment, low cost, and stable laser wavelength , which is conducive to the miniaturization and commercialization of differential absorption lidar; and the output laser wavelength does not have problems such as laser wavelength drift and laser wavelength calibration, which is conducive to the realization of automatic continuous measurement of lidar; innovative use of four-wavelength ultraviolet grating spectrometer instead of interference Optical filter, effectively reducing the problem of background noise interference during the day

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