Dualwavelength dual-field Mie scattering laser radar structure and its detecting method

Abstract

This invention discloses dual field view dual-wavelength laser radar scattering meters structure and detection methods, including laser launch unit echo signal receiver modules, the follow-up optical modules, signal detection and acquisition module and control unit; The laser launch unit using Nd: YAG laser, launching 532 nm and 1064 nm wavelength of the laser pulse at the same time and received by the diameters of 400 mm and 200 mm telescope. Two receiving optical telescope module are follow-up optical module. Optical signal from the follow-up optical module are received by the detection and acquisition module and control unit. atmospheric aerosol extinction coefficient of the vertical profile and continuous distribution, and extinction coefficient level of continuous distribution, can be analyzed through the various atmospheric aerosol optical parameters.

Description

technical field [0001] The invention relates to the field of radar detection, in particular to a structure of a dual-wavelength dual-field-of-view meter scattering laser radar and a detection method thereof. Background technique [0002] Lidar uses laser light as a light source to remotely sense the atmosphere by detecting the radiation signal of the interaction between the laser and the atmosphere. The interaction between the laser and the atmosphere generates radiation signals containing information about gas molecules and aerosol particles, from which information about gas molecules and aerosol particles can be obtained by using the inversion method. [0003] Lidar is the product of the combination of traditional radar technology and modern laser technology. In the second year after the advent of the laser, that is, in 1961, scientists proposed the idea of ​​laser radar and carried out research work. For more than 40 years, with the rapid development of laser technology ...

AI Technical Summary

Problems solved by technology

[0004] At present, the meter-scattering lidar system for detecting tropospheric aerosols generally has the following three deficiencies: first, the system is relatively complex, bulky, heavy, and difficult to move and transport, which limits its application area; secondly, the detection The height is limited, most of which are limited to the boundary layer below 5-6km, the detection height is lower during the day, and the third long-term continuous operation often has poor reliability

However, because its output energy is on the order of μJ, it relies on a high repetition rate (thousands of Hz) to improve the detection signal-to-noise ratio, so the detection time is long, and the detection height during the day is only 6km, and if its geometric overlap factor is too long (about 4km) Can not be accurately determined, will bring a large error to the aerosol detection results

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