摘要
利用蒙特卡罗方法对水介质中的气泡幕的后向光散射回波信号进行了系统仿真。通过对计算结果与实验结果的比较,证明了蒙特卡罗方法的有效性。根据仿真结果,结合理论分析的方法,对气泡幕位置、厚度和接收器视场角等参数对回波信号的影响进行了分析,结果表明:回波信号出现时间与气泡幕位置存在一一对应的关系;在气泡幕的衰减系数ρσt不变的情况下,存在一个有效气泡幕厚度,当大于该厚度时,气泡幕的后向光散射回波信号基本不变;在系统各项参数不变的情况下,适当增加接收器的视场角,可有效地提高回波信号的信噪比。
Monte Carlo simulation is used to obtain the light backscattering signal of bubble film in water. It turns out that this method is obviously validity by comparing the simulation result and the experiment result. Besides using the method of simulation combine with theoretic analysis the effect of bubble film position, thickness and receiver view of field to backscattering signals is studied. The result indicate： （1） the arrival time of bubble film＇s backscattering signal is associated with the position of bubble film; （2） there is virtual thickness when the attenuation coefficient of bubble film is changeless. If the thickness of bubble film is larger than the virtual thickness the backscattering signal of bubble film will not change obviously; （3） the SNR of bubble film backscattering signal will be improved obviously by increasing the receiver view of field propriety while the other parameters of system are unchanged.
出处
《光学技术》
CAS
CSCD
北大核心
2008年第5期713-716,720,共5页
Optical Technique
