Key optimization of light source parameters of lidar system for bioaerosol detection

VernacularTitle:生物气溶胶激光遥测系统光源关键参数优化
Author: Zijian YANG ; Feng CHEN ; Chao LI ; Ming YU ; Taihu WU
Publication Type:Journal Article
Keywords: remote sensing; lidar( laser radar); eyesafety; micro-pulse; pseudo-random modulation; aerosols
From: Military Medical Sciences 2015;(8):577-581,586
CountryChina
Language:Chinese
Abstract: Objective There are three categories of bioaerosol laser telemetry systems according to the light source configuration parameters:namely traditional lidar(light datection and ranging,laser radar), micro-pulse lidar and pseudo-random modulation(lidar).The system source parameters,which impact the degree of danger and detection sensitivity of the system, need to be optimized.Methods With reference to the USA laser product safety standards and by establishing the corresponding mathematical model of a lidar, the three categories of lidar source configuration were compared according to signal to noise ratio(SNR) and security before the repetition rate, pulse energy, divergence angle, distance and other dangerous impact factors were calculated.Results The results showed that to ensure eyesafety, the use of the pulse frequency should be set at 55 kHz for the highest SNR under the micro-pulse lidar excitation mode.Conclusion The eyesafety requirements impact the excitation of light source of a bioaerosol telemetry system.