光学学报, 2015, 35 (10): 1028001, 网络出版: 2015-10-08   

激光诱导生物气溶胶荧光雷达的设计与数值仿真

Design and Simulation of Laser Induced Bio-Aerosols Fluorescence Lidar
作者单位
西安理工大学机械与精密仪器工程学院, 陕西 西安 710048
摘要
为了评估激光诱导荧光雷达对生物气溶胶粒子的有效探测距离及随生物气溶胶浓度变化的敏感性,在阐述生物气溶胶探测原理的基础上,设计了一台激光诱导荧光雷达。该雷达选用波长为355 nm 的二极管抽运的Nd:YAG 固体激光器作为激励光源,基于脉冲能量、脉冲数量、滤光片带宽、望远镜口径、接收视场角以及生物气溶胶粒子荧光非弹性散射截面积等主要参数,对生物气溶胶荧光回波信号的信噪比进行数值仿真。仿真结果表明,生物气溶胶粒子的质量分数为10-12时,在探测误差小于10%的情况下,系统在白天和夜晚的有效探测距离分别可达1.0 km和7.8 km;而在探测距离定义为0.5 km 时,系统对生物气溶胶质量分数的最小分辨能力,白天和夜间分别为1.8×10-13和1.0×10-14。仿真结果有利于了解激光诱导荧光雷达系统的最优参数设定和最佳的实验环境,进而实现对生物气溶胶的有效探测。
Abstract
In order to evaluate the effective detection distance of bio-aerosols and sensitivity to the concentration of the bio-aerosols for the laser induced bio-aerosols fluorescence lidar. On the basis of elaborating lidar measuring principle, a fluorescence lidar employing a Nd: YAG laser at 355 nm as a transmitter is designed for biological aerosol concentration detection. The signal-to-noise ratio (SNR) of bio-aerosols fluorescence echo signal is simulated based on the main parameters, such as pulse energy, pulse number, filter bandwidth, diameter of telescope, field of view of telescope and inelastic scattering cross-section of bio-aerosols particles. With the uncertainty of less than 10%, theoretical analysis results show that the system is capable of measuring bio-aerosols with a mass fraction of 10-12 up to an effective detection distance of 1.0 km and 7.8 km at daytime and nighttime, respectively. Moreover, with a certain detection rang of 0.5 km, the fluorescence lidar is able to detect bio-aerosols at a minimum mass fraction of 1.8×10-13 at daytime and 1.0×10-14 at nighttime. Simulated results are helpful to understand the optimal parameters of laser induced fluorescence lidar and also the best experimental environment of the system, and then realize effective detect to bio-aerosols.

饶志敏, 华灯鑫, 何廷尧, 乐静. 激光诱导生物气溶胶荧光雷达的设计与数值仿真[J]. 光学学报, 2015, 35(10): 1028001. Rao Zhimin, Hua Dengxin, He Tingyao, Le Jing. Design and Simulation of Laser Induced Bio-Aerosols Fluorescence Lidar[J]. Acta Optica Sinica, 2015, 35(10): 1028001.

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