远场微气泡尾流的后向散射线偏振度探测法  

Detection method for distant wake with microbubbles by degree of linear polarization of backscattering

作　　者：韦文涛[1] 王江安[1] 马治国[1] 曹静[1] 吴荣华[1] 梁善勇[1] 

机构地区：[1]海军工程大学电子工程学院,湖北武汉430033

出　　处：《红外与激光工程》2012年第6期1485-1489,共5页Infrared and Laser Engineering

基　　金：国防预研基金(51302050302)

摘　　要：针对后向散射光强特性难以探测远场微气泡尾流的问题,利用矢量Monte Carlo方法对气泡尾流的多层多分散模型中线偏振光入射时后向散射的光强和线偏振度信号进行了仿真。验证了光强信号的"双尖峰"特性,同时发现了线偏振度信号的"双下降速率"特性,根据此特性提出了气泡尾流的线偏振度探测法。与常用的光强探测法相比,该方法的探测距离更远,气泡半径更小,是一种有效的远场微气泡尾流探测法。In a proposed multilayer poly-disperse model of wake with bubbles, the intensity and linear polarization degree of incident linear depolarized light backscattering signal were simulated with vector Monte Carlo method to solve the problem that distant wake with microbubbles is difficult to detect by light intensity of backscattering. The results validated ＂two peak＂ character in the intensity signal curve caused by shape wake with bubbles, and predicted ＂two falling speed＂ character in the degree of polarization curve caused by the same reason. The propriety of the degree of polarization curve was used to detect shape wake with bubbles as a new method. Compared with the usual method using intensity signal on different distances of wake and radii of bubbles, the new method can detect wake with further distance and lower extinction coefficient of bubbles. It can be used as a more effective method to detect distant wake with rnicrobubbles.

关 键 词：气泡尾流 后向散射 MonteCarlo方法 线偏振度 光强 

分 类 号：TN249[电子电信—物理电子学]