不同紫外波段激发生物气溶胶荧光雷达系统性能分析

发布时间：2018-01-12 04:32

  本文关键词：不同紫外波段激发生物气溶胶荧光雷达系统性能分析　出处：《光子学报》2017年12期 　论文类型：期刊论文

  更多相关文章： 荧光雷达 信噪比 激光诱导荧光 生物气溶胶 臭氧 太阳背景光 数值仿真

【摘要】：基于激光诱导生物荧光技术,分别采用紫外355nm和266nm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266nm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50μg/L时,最大探测距离仅为300m;而夜间情况下,太阳背景光影响减弱,探测距离约为450m.三倍频355nm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750m;白天太阳背景光对355nm的系统影响较大,在相同0.5mrad接收视场角下,其有效探测距离约为330m.为减少白天背景光的影响,将望远镜接收视场角压缩到0.3mrad,同时选用50nm带宽的滤光片,此时系统的探测距离为480m.由于355nm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266nm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 the technology of laser induced bioluminescence, ultraviolet 355nm and 266nm laser were used as excitation light source, respectively, and the model of biological aerosol fluorescence radar monitoring system was constructed. Different excitation bands were considered synthetically. The effects of ozone absorption and solar background light on the fluorescence detection efficiency of lidar are analyzed numerically. The simulation results show that the system is excited by the fourth harmonic wavelength of 266 nm UV. The system is affected by surface ozone, and the effective detection range is very limited during the day. When the SNR of the system is 10 渭 g / L and the ozone concentration is 50 渭 g / L, the maximum detection range is only 300 m. At night, the influence of solar background light is weakened, and the detection range is about 450 m.The ozone has little effect on the detection performance of the system when the frequency of triple frequency is 355nm, and the detection range can reach 750m at night. The solar background light has a great influence on the system at 355nm during the day. At the same angle of view, the effective detection range is about 330mm. in order to reduce the influence of the background light during the day. The angle of view received by the telescope was compressed to 0.3 mrad.The filter with a bandwidth of 50 nm was also selected. The detection range of the system is 480 m. Because the excitation fluorescence in 355nm band is greatly influenced by the background light of the sun during the day, the better results can be obtained when the system is detected at night. The 266nm excitation band can suppress the background light and can effectively detect biological aerosols during the day.
【作者单位】： 西安理工大学机械与精密仪器工程学院;
【基金】：国家自然科学基金(Nos.41405028,61675167)资助~~
【分类号】：TN958
【正文快照】： 0　引言稳定悬浮在空气中的固相或液相粒子(0.01~100μm之间)组成的分散相被称为气溶胶[1].大部分气溶胶颗粒属于可吸入颗粒物(10μm),可以通过肺泡进入人体并极易引发各种疾病[2].具有生物活性的气溶胶被称为生物气溶胶.生物气溶胶种类可以细分为:细菌、真菌、病毒、毒素、，

本文编号：1412721