双波长荧光雷达探测大气生物气溶胶的性能分析
发布时间：2018-11-06 17:10
【摘要】：生物气溶胶在大气中扩散极易传播和发生各种流行疾病,也是生物武器投放的主要形式,实现生物气溶胶实时、远距离的探测显得尤为重要。构建了一台双波长荧光雷达用于大气中生物气溶胶的预警和识别。该雷达系统采用Nd∶YAG固体激光器作为激励光源,基频1 064nm、四倍频266nm作为工作波长。基于激光诱导荧光雷达探测原理,对红外波段的弹性散射信号和紫外波段诱导的荧光信号进行数值分析。结果显示,在探测误差小于10%的情况下,距离为1.0km时,单激光脉冲测量得到白天和夜晚细菌孢子的最小探测浓度分别为15 100个颗粒·L~(-1)和8 386个颗粒·L~(-1);当脉冲数累加到10 000时,白天和夜晚的细菌孢子最小探测浓度显著改善,分别为144个颗粒·L~(-1)和77个颗粒·L~(-1)。分析结果还表明,通过红外波段确定细菌孢子云团位置后,为了提高系统对细菌孢子的探测性能,可增加紫外激光脉冲数量,延长荧光信号采集时间。
[Abstract]:Biological aerosol diffusion in the atmosphere is easy to spread and occur a variety of epidemic diseases, is also the main form of biological weapons, the realization of biological aerosol real-time, long-range detection is particularly important. A dual wavelength fluorescent radar was constructed for early warning and identification of biological aerosols in the atmosphere. The radar system uses Nd:YAG solid-state laser as exciting light source, fundamental frequency 1064nm and quadruple frequency 266nm as working wavelength. Based on the principle of lidar detection, the elastic scattering signal in infrared band and fluorescence signal induced in ultraviolet band are numerically analyzed. The results show that when the detection error is less than 10% and the range is 1.0km, The minimum detectable concentrations of bacterial spores in day and night were 15 100 L ~ (-1) and 8 386 L ~ (-1), respectively. When the number of pulses accumulated to 10 000, the minimum detection concentration of bacterial spores was significantly improved at day and night, with 144 particles L ~ (-1) and 77 particles L ~ (-1), respectively. The results also show that the number of ultraviolet laser pulses and the time of fluorescence signal acquisition can be increased in order to improve the detection performance of bacterial spores by determining the location of bacterial spores in infrared band.
【作者单位】： 西安理工大学机械与精密仪器工程学院;
【基金】：国家自然科学基金项目(61675167,41405028,41627807)资助
【分类号】：O657.3;R122.1
本文编号：2314921
[Abstract]:Biological aerosol diffusion in the atmosphere is easy to spread and occur a variety of epidemic diseases, is also the main form of biological weapons, the realization of biological aerosol real-time, long-range detection is particularly important. A dual wavelength fluorescent radar was constructed for early warning and identification of biological aerosols in the atmosphere. The radar system uses Nd:YAG solid-state laser as exciting light source, fundamental frequency 1064nm and quadruple frequency 266nm as working wavelength. Based on the principle of lidar detection, the elastic scattering signal in infrared band and fluorescence signal induced in ultraviolet band are numerically analyzed. The results show that when the detection error is less than 10% and the range is 1.0km, The minimum detectable concentrations of bacterial spores in day and night were 15 100 L ~ (-1) and 8 386 L ~ (-1), respectively. When the number of pulses accumulated to 10 000, the minimum detection concentration of bacterial spores was significantly improved at day and night, with 144 particles L ~ (-1) and 77 particles L ~ (-1), respectively. The results also show that the number of ultraviolet laser pulses and the time of fluorescence signal acquisition can be increased in order to improve the detection performance of bacterial spores by determining the location of bacterial spores in infrared band.
【作者单位】： 西安理工大学机械与精密仪器工程学院;
【基金】：国家自然科学基金项目(61675167,41405028,41627807)资助
【分类号】：O657.3;R122.1
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，本文编号：2314921
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