降雨对532nm和1064nm激光传输的衰减特性研究  

Attenuation and Transmission of Laser Radiation at 532 nm and 1064 nm through Rain

作　　者：郭婧[1] 张合[1] 王晓锋[1] 

机构地区：[1]南京理工大学智能弹药技术国防重点学科实验室,江苏南京210094

出　　处：《光学学报》2011年第1期24-30,共7页Acta Optica Sinica

基　　金：国家自然科学基金(60908037);国家部委基金(9140A05010610BQ02)资助课题

摘　　要：降雨会对激光信号产生严重的衰减,从而给激光目标探测的应用带来一定影响。激光在降雨中的传输衰减已在红外波段做了大量的实验研究,而可见光波段激光在雨中的传输衰减特性还未见报道。基于夫琅禾费衍射和几何光学散射理论,建立雨滴对532nm绿激光和1064nm近红外激光光束的传输衰减模型,对比分析两波长激光在不同降雨量下的衰减特性,并通过实验测试验证衰减模型的准确性。理论分析和实验结果表明,两波长的散射损耗差别微小,但雨滴对1064nm激光的吸收作用明显,透射率低于532nm,这为绿激光在降雨环境下目标探测系统中的应用提供了一定的理论和实验依据。Rainfall can bring serious attenuation to the laser signals,so it will take some influence to the laser detection system applied in the rain.The attenuation of laser beam propagating in the rain is lucubrated in the infrared range,but the attenuation of green laser in the rain has not been reported.Therefore,based on Fraunhofer diffraction and geometric optics theory,the attenuation model of laser radiation at 532 nm and 1064 nm by raindrops is founded,and the attenuation characteristics are contrasted and analyzed.Then,the veracity of attenuation model is validated by experiments.Theory analysis and experimental results indicate that the differences of the scattering loss between the two wavelengths are slight,but the absorption of the raindrops to the 1064 nm is obvious,so the transmittance of laser radiation at 1064 nm is lower than 532 nm.Attenuation and transmission characteristics of laser in rain provide theoretical basis for green laser applied in the detection system working in the rain.

关 键 词：激光探测 降雨衰减 雨滴散射 绿激光 

分 类 号：TN247[电子电信—物理电子学]