人眼安全的生物气溶胶短程遥测系统

建立了满足激光辐照人眼安全要求的便携式生物气溶胶短程遥测系统,用于实现有人员活动区域生物战剂气溶胶的实时预警监测。以高频调制的405nm半导体激光器为激发光源,200mm口径的卡塞格林望远系统为信号光收集系统,搭建了基于伪随机调制的便携型生物气溶胶激光雷达短程遥测系统。该系统具备平行偏振散射、垂直偏振散射光探测,以及450nm和530nm两个波段荧光探测等四个同步探测通道。以枯草芽孢杆菌、金黄色葡萄球菌和酵母菌为样本对该激光雷达系统进行了初步测试。外场试验表明,该生物气溶胶遥测系统的空间分辨率为1.5m,荧光通道的探测距离为100m;3种被测生物气溶胶种类识别的回代误报率分别为9%、11.5%和14.5%,交叉误报率为11.3%。该遥测系统的激光能量低于激光辐照人眼安全标准的要求,基本实现了生物气溶胶的甄别。

Eye-safe LIDAR for short-range stand-off detection of bio-aerosols

A portable bio-aerosol short-rang lidar-measuring system which meets laser irradiation eye-safe requirement was established to realize real-time warning and monitoring of aerosol of biological warfare agent in human activity areas. Taking a 405 nm semiconductor laser with high-frequency modulation as the excitation light source and a 200 mm-caliber Cassegrain telescope system as the signal light collection system， the portable bio-aerosol laser radar short-range lidar-measuring system based on pseudo-random modulation was mounted. The system was equipped with 4 synchronizing detection channels: parallel polarization scattering and vertical polarization scattering light detection, 450 nm and 530 nm waveband fluorescence detections. Bacillus subtilis, staphylococcus aureus and yeast was taken as examples in the preliminary test of the laser radar system. The out-field experiment shows that the spatial resolution of the bio-aerosol lidar-measuring system is 1.5 m and detection distance of fluorescence channel is 100 m; the false alarm rate of back substitution for variety recognition of three bio-aerosols is 9%, 11.5% and 14.5% and crossing false alarm rate is 11.3%. The laser energy of the lidar system is lower than the requirement of laser irradiation eye-safe standard and it realizes identification of bio-aerosols basically.