Atmospheric component detection laser radar based on dispersion gating

Abstract

The invention provides an atmospheric component detection laser radar based on dispersion gating. The atmospheric component detection laser radar enables femtosecond laser to be stretched into wide-pulse laser in a time domain through dispersion, a femtosecond spectrum is mapped into a broadened laser pulse through group velocity dispersion, through the time domain gating of an intensity modulator, selection of the laser with the preset wavelength is completed, and scanning of the laser wavelength is achieved by adjusting time delay of an electric driving signal of the intensity modulator. Anabsorption spectrum of a specific atmospheric component is obtained through laser wavelength scanning, so that the concentration of the atmospheric gas component is measured. The atmospheric componentdetection laser radar can accurately gate the wavelength of the emitted laser at will, the wavelength selection precision is high, and the scanning detection of various gases can be realized by adjusting the central wavelength of a filter.

Description

technical field [0001] The invention relates to the technical field of laser radar, and more specifically, relates to a laser radar for detecting atmospheric components based on dispersion gating. Background technique [0002] The detection of atmospheric composition plays an important role in climatology, meteorological research, release of biological and chemical weapons, prevention of forest fires, and prevention and control of air pollution. [0003] Among the current detection methods, single-point detection techniques include: Differential Optical Absorption Spectroscopy (DOAS for short), Non-Dispersive Infrared (NDIR for short), and cavity ring-down spectroscopy ( Cavity Ring-down Spectroscopy (CRDS for short), Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (IBBCEAS for short), Laser-induced Fluorescence (LIF for short), Ultraviolet-visible spectrophotometry (Ultraviolet –visible spectroscopy (UV-Vis for short), tunable diode laser absorption spectrosco...

AI Technical Summary

Problems solved by technology

[0006] At present, differential absorption lidar has achieved H 2 O.CO 2 , CO, HCI, NH 3 , NO 2 , SO 2 and O 3 However, the disadvantage of differential absorption lidar is that it can only detect the composition of a single gas

[0007] Based on the wavelength-scanning lidar with hyperspectral resolution, the composition information of different gases can be obtained by scanning the spectrum. However, its disadvantage is that the wavelength tuning through PZT or motors requires real-time calibration and locking of the outgoing laser wavelength, and its system structure is complex.

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