多波长荧光激光雷达测生物气溶胶的数值模拟计算

Multi-wavelength fluorescence lidar detection of bioaerosols

多波长荧光激光雷达系统用来在生物气溶胶或烟尘到达地面之前进行远距离探测,该系统是一种主动遥感系统,同时具有紫外和红外探测的能力。紫外波长能够提供对生物气溶胶云近实时的探测,并具有一定的分辨能力;红外波长的使用扩大了系统对气溶胶云的探测距离。文中对系统进行了简单描述,同时估算了激光诱导荧光技术探测生物气溶胶的能力,对白天和晚上探测生物气溶胶粒子的信噪比进行了数值模拟,分析了影响信噪比的因素,对实际系统的构建具有指导意义。

Multi-wavelength lidar systems are designed to detect and identify biological agents at a distance away from the aerosol/plume or from the detector system,before the agents reach the location of the system.It is an active standoff detection system with both ultraviolet (UV) and infrared (IR) capability.The UV wavelength can provide near real time detection and ranging of bioaerosol cloud with demonstrated discrimination capability,the IR wavelength extends the cloud detection range and acquisition capability.The system and the capability of Laser Induced Fluorescence(LIF) technique for the detection of bioaerosols are described.It shows a numerical simulation of signal-to-noise of the fluorescence of bioaerosol particles as a function of ranges,and for both day and night operational scenarios.