光子学报, 2017, 46 (12): 1201002, 网络出版: 2017-11-23   

不同紫外波段激发生物气溶胶荧光雷达系统性能分析

Performance Analysis of Fluorescence Lidar with Different Excited Wavelengths
作者单位
西安理工大学 机械与精密仪器工程学院,西安 710048
摘要
基于激光诱导生物荧光技术, 分别采用紫外355 nm和266 nm激光作为激发光源, 构建生物气溶胶荧光雷达监测系统模型.综合考虑不同激发波段, 臭氧吸收以及太阳背景光等因素对激光雷达荧光探测效果的影响, 对系统性能进行数值仿真分析.仿真结果表明, 在四倍频266 nm紫外波段的激光激发下, 系统受地表臭氧的影响, 白天的有效探测距离非常有限; 在系统信噪比为10(SNR=10), 臭氧浓度为50 μg/L时, 最大探测距离仅为300 m; 而夜间情况下, 太阳背景光影响减弱, 探测距离约为450 m.三倍频355 nm激发时, 臭氧对系统的探测性能影响较小, 夜间探测距离可达750 m; 白天太阳背景光对355 nm的系统影响较大, 在相同0.5 mrad接收视场角下, 其有效探测距离约为330 m.为减少白天背景光的影响, 将望远镜接收视场角压缩到0.3 mrad, 同时选用50 nm带宽的滤光片, 此时系统的探测距离为480 m.由于355 nm波段的激发荧光受白天太阳背景光的影响较大, 在进行夜间探测时才可获得较好的效果; 而266 nm的激发波段可以很好的抑制背景光影响, 能够实现对生物气溶胶的白天有效探测.
Abstract
Based on laser induced bioluminescence technique, ultraviolet 355 nm and 266 nm laser were used as excitation light source respectively to construct a model of biological aerosol fluorescence radar monitoring system. The effects of different excitation bands, ozone absorption and solar background light on lidar fluorescence detection are comprehensively considered. The system performance is numerically simulated and analyzed. The simulation results show that the system with the laser excitation of 266 nm band, is strongly affected by the surface ozone, so the effective detection range at daytime is very limited. When the system signal-to-noise ratio is 10 (SNR=10), ozone concentration 50 ppb, the maximum detection range is about 300 m. While at the night time conditions, the detection range is about 450 m. For the excitation of 355 nm, ozone has little effects on the detection performance of the system, its detectable range up to 750 m at night. Solar background light effects on 355nm quite large at the field of view 0.5 mrad, where the effective detection range is about 330 m. In order to reduce the influence of daytime background light, the field of view of the telescope was compressed to 0.3 mrad, and the filter with 50 nm bandwidth was used. The detection range can be up to 480 m at this case. In the conclusions, the excitation of 355 nm band should better be used in night time measurement, while excitation band of 266 nm can well inhibit the effects of solar background light, so as to realize the effective detection of biological aerosols during the day.

王强, 何廷尧, 华灯鑫. 不同紫外波段激发生物气溶胶荧光雷达系统性能分析[J]. 光子学报, 2017, 46(12): 1201002. WANG Qiang, HE Ting-yao, HUA Deng-xin. Performance Analysis of Fluorescence Lidar with Different Excited Wavelengths[J]. ACTA PHOTONICA SINICA, 2017, 46(12): 1201002.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!