论文部分内容阅读
文中对半导体激光器进行调制,用分束平片将被调制的激光束分成透射光束和反射光束,透射光束作为探测光束,反射光束作为参考光束。同时,测量探测光束在前向散射区35°角的散射光功率和参考光束的功率,用散射功率与参考光功率之比来计算角散射系数。激光器输出光功率波动时,探测光束和参考光束同步波动,散射光功率与参考光功率之比不受光源波动的影响。用2μm石英颗粒作为散射源,对构建的装置进行测试。结果表明,角散射系数与石英微粒浓度成线性关系,相关系数为0.99。双通道测量方式可以用于水底能见度的测量。
In this paper, the semiconductor laser is modulated. The modulated laser beam is divided into transmitted beam and reflected beam by beam splitting and flat plate. The transmitted beam is used as probe beam and the reflected beam is used as reference beam. At the same time, the scattered light power and reference beam power of the probe beam at the angle of 35 ° in the forward scattering region were measured, and the ratio of the scattering power to the reference light power was used to calculate the angular scattering coefficient. When the output power of the laser fluctuates, the probe beam and the reference beam fluctuate synchronously, and the ratio of the scattered light power to the reference light power is not affected by the fluctuation of the light source. The constructed device was tested with 2 μm quartz particles as a scattering source. The results show that the angular scattering coefficient is linear with quartz particle concentration, and the correlation coefficient is 0.99. Dual channel measurement can be used for underwater visibility measurement.