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目的生物气溶胶激光遥测系统按光源配置参数主要分为3类,即传统激光雷达、微脉冲激光雷达、伪随机调制激光雷达。其系统光源参数严重影响系统的危险性和探测灵敏度,需要进行优化计算。方法参考美国关于激光产品使用的安全标准,并建立对应的激光雷达的数学模型,对比3种激光雷达光源配置方式的信噪比(SNR)和安全性,计算重复频率、脉冲能量、发散角、危险距离等因素的影响。结果计算结果表明,在保证人眼安全的前提下,使用微脉冲雷达的光源激发方式,脉冲频率设置约为55 k Hz时系统探测的SNR最高。结论人眼安全是前提,对于激光遥测系统的光源激发方式影响较大,该文计算出最优的光源配置方法,阐明了较为安全的应用方式。
Objective Bio-aerosol laser telemetry system according to the light source configuration parameters are divided into three categories, namely, the traditional laser radar, micro-pulse laser radar, pseudo-random modulation laser radar. The system light parameters seriously affect the system’s risk and detection sensitivity, the need for optimization calculations. Methods Reference to the safety standards for laser products in the United States and the corresponding mathematical model of lidar were established. The signal-to-noise ratio (SNR) and safety of the three laser lidar configurations were compared. The repetition frequency, pulse energy, divergence angle, Dangerous distance and other factors. Results The calculated results show that the system uses the excitation mode of light source of micropulse radar to ensure the safety of the human eye. When the pulse frequency is set to about 55 k Hz, the SNR of the system detection is the highest. Conclusions Human eye safety is a prerequisite, which has a great influence on the excitation mode of the light source of the laser telemetry system. This paper calculates the optimal light source configuration method and illustrates the safer application method.