基于大气散射延时的激光离轴检测方法

Laser off-axis detection method based on delay time of atmosphere scattering

文章基于激光的传输和散射物理特性,建立了激光信号探测的二维解析模型,得到了在不同探测角度条件下的散射场能量,导出了后向散射光的到达延迟时间与探测角度和离轴距离关系的理论公式。在近轴、远距离传输情况下的离轴距离与延迟时间成简单的线性关系。延迟时间虽然取值很小,但大于脉冲宽度,提出了采用精确测量接收信号的延迟时间来实现二维空间中激光束离轴定位的方法。

Based on the physical characters of laser＇s propagation and scattering, two dimension analytical model of laser signal detection was established and scattered field＇s energy of different detecting angles was obtained and the theoretical formula of Mie scattering laser arriving delay time＇s relationship with detecting angles and off-axis distance was derived, The simple linear relationship between off-axis distance and delay time was also derived in the case of paraxial and remote transmission. The value of delay time is very small but bigger than that of impulse length. By accurately measuring the delayed time of the incepted signal, a method of off-axis orientation laser beam in two dimensional spaces is put forward.