The effluent conduit joints , fuel gas pipe valves , elevator brakes and such electromechanic products of ezhou sanwei casting co . , ltd are exported to britain , the us and germany , etc . of which , the port tappets are exported to cummins which leads in power equipment manufacture worldwide ; pipe joints and valves are exported to the us mueller group which is the biggest supplier of such products in north america 鄂州三维铸业有限公司所生产的出水管道接头、燃气管道阀门、电梯制动器等机电产品及汽车零部件出口到英、美、德等国家,其中汽门挺杆出口到世界领先的动力设备制造商美国康明斯公司,管道接头及阀门出口到此类产品北美地区最大供应商美国mueller集团。
A monte carlo algorithm was presented to model the relation between the scattering phenomenon , depolarization changes and sea water depth , it is discovered that the radius of scattering point and the degree of depolarization increase with increasing of the sea water depth . at last , a optical engineering software ( lighttools ) is introduced to simulate optical scattering in the deep sea water , and studys the corelation between scattering and relative refractive index , particle density and particle size in the sea water . the experiment results show that the intensity of scattering will increase evidently with the increasing of particle size , particle density and relative refractive index . the methods and results in the article provide the basic theory and experiment validation for improving performance of communication , detection and imaging under sea water 本文以球形粒子的mie散射理论、 stokes矢量法以及mueller矩阵来研究海水的散射特性和散射中的退偏振度变化;通过montecarlo方法模拟蓝绿激光在海水传输过程中的散射现象以及散射中的退偏度变化与海水深度的关系,发现随着海水深度的增加,散射后的光斑半径、退偏振度将逐渐增大。最后通过光学工程软件( lighttools )对海水中的散射进行仿真实验,研究散射与海水中粒子密度、粒子大小和相对折射率的关系。实验结果表明,随着粒子半径、粒子密度和相对折射率的增加,散射的强度将显著增加。
