Difference absorb laser radar device based on tunable light source

Abstract

The invention discloses a difference absorb laser radar device based on a tunable light source. The difference absorb laser radar device comprises a laser, a light path for generating a difference wave length laser beam and related parts for laser beam combination and emission, optical scanning and receiving and signal spectral detection. Particularly, two sets of YAG lasers (1 and 2) are adopted in a laser radar emitting part to serve as a pumping source of four sets of tunable lasers (7, 8, 9 and 10); four paths of laser beams emitted by the tunable lasers are emitted out through one path via a beam combining optical part (19, 20 and 26); a periscope type scanner (28) is adopted to achieve space distribution scanning. The difference absorb laser radar device can fast detect space distribution of pollutant gases including nitrogen dioxide, sulfur dioxide, ozone and the like in the atmosphere with high precision in real time. The difference absorb laser radar device is simple in structure and low in manufacturing cost, and precision errors are small.

Description

technical field [0001] The invention relates to a pollutant profile laser radar measuring device, in particular to a differential absorption laser radar device based on an adjustable light source. Background technique [0002] At present, in order to detect the spatial distribution profile of pollutant gases in the atmosphere, people often use the method of multi-wavelength differential absorption lidar. For example, an invention patent CN 1877308A (announcement date of authorization is December 13, 2006) issued by one of the applicants, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, describes a kind of "vehicle pollution measurement laser radar based on Raman light source device". The device uses a Nd:YAG laser to pump different Raman tubes in time division to generate different stimulated Raman wavelengths for detecting polluted gases. However, this method and device have some disadvantages: (1) Although the stimulated Raman light source i...

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Problems solved by technology

However, this method and device have some disadvantages: (1) Although the stimulated Raman light source is simple and cheap, the stimulated Raman wavelength is fixed, and the optimal differential wavelength cannot be selected, so the measurement accuracy is relatively poor; (2 ) In order to emit different laser wavelengths, it is necessary to move the Raman tube back and forth, which affects the stability of the measurement and brings measurement errors; (3) Only one kind of pollution gas can be detected at a time

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