非线性拟合消光比测量方法  

Method for Extinction Ratio Measurement Using Nonlinear Fitting

作　　者：李小龙[1] 李磊磊[2] 何川[1] 张旭升[1] 

机构地区：[1]北京理工大学精密光电测试仪器及技术北京市重点实验室,北京100081 [2]北京理工大学自动化学院,北京100081

出　　处：《激光与光电子学进展》2016年第2期195-199,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61405011);总装预研基金(9140A09050313BQ01127);北京理工大学基础研究基金(20140442003)

摘　　要：为克服光电探测器动态范围不足,难以在同一条件下精确测量线偏振器的最小光强透射率及最大光强透射率的问题,提出一种基于非线性拟合的消光比测量方法并搭建了相应的测量装置。该方法只需在限定的角度范围内旋转被测线偏振器并采集对应的光强变化,根据建立的数学模型,进行非线性余弦拟合数据处理,进而解算出消光比。实验结果表明,该方法的测量精度可达10-5量级,并具有较好的重复性,验证了提出方法的有效性。To overcome the shortage on dynamic range of the photoelectric detector, and the difficulties on accurate measurement of both the minimum and maximum intensity transmittances of the linear polarizer under the same condition, a method for extinction ratio measurement based on nonlinear fitting is proposed. The experimental system is setup. The measured polarizer is rotated only within a limited angular range to detect the transmitting intensities. Then, based on the principle of the model, the nonlinear fitting is applied on the obtained intensity data to calculate the extinction ratio. The experimental results show that the measured accuracy of 10^-5 level can be achieved. Also, good repeatability and effectiveness of the proposed method are verified.

关 键 词：物理光学 偏振光学 线偏振器 消光比 非线性拟合 

分 类 号：O436[机械工程—光学工程]