Novel Saborne atmosphere laser radar based on TDLAS (tunable diode laser absorption spectroscopy) technology

Abstract

The invention discloses a novel Sabortus atmosphere laser radar based on a TDLAS (tunable diode laser absorption spectroscopy) technology. The novel Sabortus atmosphere laser radar can detect gas in the atmosphere in an infrared band. The radar comprises a first function generator, a laser driver, a diode laser, a second function generator, a collimation system, a receiving optical system, a lock-in amplifier, a data acquisition card, a PC terminal and a mechanical scanning probe device. The wavelength modulation spectrum technology (WMS) in the TDLAS technology is combined with the Saborne atmosphere laser radar technology, and the mechanical scanning probe device is used for replacing an image detector, so that the sensitivity and the resolution of the system are improved, the detection wavelength range is enlarged, and gas in the atmosphere can be detected in an infrared band.

Description

technical field [0001] The invention relates to the technical field of atmospheric remote sensing detection, and relates to a novel Sabouraud atmospheric laser radar based on TDLAS technology, which can detect gases in the atmosphere in the infrared band. Background technique [0002] With the continuous development of industrial production and transportation, the atmospheric environment is also facing severe challenges. Various air pollutants and air pollution conditions are increasingly harmful to people's living environment and health. Atmospheric remote sensing detection technology and related equipment are widely used in air pollution monitoring because of their long-distance, non-contact measurement and automatic operation. [0003] Scheimpflug lidar (SLidar for short) is based on the Scheimpflug imaging principle: when the object plane of the imaging system is not parallel to the lens, as long as the image plane, the object plane, and the plane where the lens is locat...

AI Technical Summary

Problems solved by technology

[0006] (2) Since the image detector uses multiple pixels of the area array to detect signals, its illumination sensitivity is not high and its detection capability is limited

[0007] (3) At present, the receiving unit of Sabouraud lidar system mostly uses commercial integrated CMOS image sensor, but its noise is large, which is one of the main sources of system noise, which is not conducive to the next step of signal processing and analysis

[0008] (4) Most of the image detectors detect wavelengths in the visible light band, and the quantum efficiency of the detectors in the infrared band is very low or even 0. This is the detection of the backscattering signal of the laser radar that detects in the mid-infrared band. have a great impact

If you choose a special infrared band image detector, not only the quantum efficiency will be limited, but the price will increase geometrically.

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