Multiband Raman-fluorescence laser radar system

Abstract

A multiband Raman-fluorescence laser radar system comprises a laser emitting system, an echo signal receiving system and a signal collecting system, and can detect multiband polarized mie scattering signals, nitrogen and water vapor Raman scattering signals and 32-channel night atmosphere fluorescence signals at the same time. The laser emitting system can emit laser beams of 355nm, 532nm and 1064nm at the same time; the echo signal receiving system splits and filters echo signals to acquire polarized mie scattering signals of 355nm and 532nm and Raman scattering signals of 607nm and 660nm; the signal collecting system is connected with the echo signal receiving system, collects vertical and horizontal polarized mie scattering signals of 355nm and 532nm, nitrogen and water vapor Raman signals of 607nm and 660nm and night atmosphere weak fluorescence signals of 32-channel wavelength and combines detection of the night atmosphere weak fluorescence signals of 32-channel wavelength with detection of the polarized mie scattering signals of 355nm and 532nm and waveband of 607nm and 660nm to detect and study spatial and temporal distribution features and complex composition of bioaerosol, atmosphere water vapor spatial and temporal distribution, haze carcinogenic composition and generation and disappearance process.

Description

technical field [0001] The invention relates to a laser radar system, in particular to a laser radar system for simultaneously detecting multi-band and multi-type scattering signals. Background technique [0002] Lidar is a very important detection method to obtain the vertical structure of the atmosphere. Its hardware system is mainly composed of three parts: laser emitting system, echo signal receiving system and data acquisition system. When the collimated laser beam emitted from the laser is transmitted in the atmosphere, it interacts with atmospheric particles, and the backscattered signal is received by the echo signal receiving system, and then the signal acquisition is completed by the data acquisition system after splitting. According to the interaction mechanism between the laser beam and different atmospheric particles, and the detection content of the lidar, a lidar system with different functions can be realized. [0003] Bioaerosol, as an important part of th...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a multi-band Raman-fluorescence laser radar system, which combines the detection of weak night-time atmospheric fluorescent signals with 32 channel wavelengths with the detection of 355nm and 532nm polarized meter scattering signals, and the detection of 607nm and 660nm bands for detection research Bioaerosol and smog solve the problem of single function of the existing lidar system at this stage

Use the licel transient recorder to simultaneously record 355nm, 532nm vertically and horizontally polarized meter scattering signals, and 607nm, 660nm nitrogen and water vapor Raman signals in two ways, analog and photon counting, to solve the data acquisition of the existing lidar system at this stage one-way problem

Images