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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。
In order to evaluate the effective detection distance of bio-aerosol particles by laser-induced fluorescence radar and its sensitivity to the change of bio-aerosol concentration, a laser-induced fluorescence radar was designed based on the principle of bio-aerosol detection. Based on the pulse energy, the number of pulses, the bandwidth of the filter, the aperture of the telescope, the field of view of reception, and the fluorescence inelastic scattering of biological aerosol particles, the diode-pumped Nd: YAG solid state laser with a wavelength of 355 nm was chosen as the radar. Area and other major parameters of the biological aerosol fluorescence echo signal to noise ratio for numerical simulation. The simulation results show that the effective detection range of the system is 1.0 km and 7.8 km respectively when the mass fraction of bio-aerosol particles is 10-12 and the detection error is less than 10%. In the definition of detection range Is 0.5 km, the minimum resolving power of the system to bioavaer mass fraction is 1.8 × 10-13 and 1.0 × 10-14 at daytime and nighttime, respectively. The simulation results are helpful to understand the optimal parameter setting and the best experimental environment for laser-induced fluorescence radar system, and then realize the effective detection of bio-aerosol.