摘要
本文着重讨论了双光束条纹型激光多普勒测流系统中,光学分束系统参数与散射信号的关系,列出了有关的公式。计算了园形截面的散射颗粒直径与干涉条纹周期呈不同比值时对信号的影响,其结果与以前采用矩型截面进行计算的结果差异较大。以设计一台激光海流计为例,推荐一种以选择与散射粒径相匹配的条纹周期为出发点的光学参数选择方法。最后介绍作者提出的为实现这种选择的光学布置。
The effects of parameters of optical beam splitter on-Doppler signals in a dual beam LDV were discussed, and the formulae about these effects were given. The effect on signals caused by the influence of different ratios of fringe separationto diameter separations to diameters of scattering particles was calculated by the author. It showed(?)a great difference between the round cross section of particles and the square cross section that calculated by others before.With an example of designing a laser sea current meter, the method electing the spacial period of fringe with respect to match the diameter of scattering particles was recomended. Finally, an configuration in which those parameters could be adjected independently was introduced.
