海底能见度测量方法的研究

A Study on the Measurement Method of Submarine Visibility

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。

The modulated laser beam is divided into a transmitted light beam and a reflected beam by a beam splitter. Transmitted beam is used as the probe beam, and the reflected beam is used as the reference beam. At the same time, the power of the scattered light at the 35 degree angle of the forward scattering region and the power of the reference beam were measured. Angular scattering coefficient is calculated by the ratio of scattering power to reference power. When the laser output power fluctuates, the probe beam and the reference beam synchronously fluctuate, and the ratio of the scattered light power to the reference optical power is not affected by the fluctuation of the light source. 2 p,m quartz particles were used as the scattering source, the results tested on the construction of the device show that the angular scattering coefficient is linearly related to the concentration of quartz particles, and the correlation coefficient is 0.99. Dual channel measurement method can be used for underwater visibility measurement.