基于弹光调制的双折射测试系统数据处理研究  

Study on data processing of birefringence measurement system based on photoelastic modulation

作　　者：杜洽伟 李克武[2,3] 王志斌 DU Qiawei;LI Kewu;WANG Zhibin(School of Instruments and Electronics,North China University,Taiyuan 030051,China;Institute of Frontier Interdisciplinary Sciences,North University of China,Taiyuan 030051,China;North Central University Shanxi Optoelectronic Information and Instrument Engineering Technology Research Center,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器与电子学院,山西太原030051 [2]中北大学前沿交叉科学研究院,山西太原030051 [3]中北大学山西省光电信息与仪器工程技术研究中心,山西太原030051

出　　处：《光学技术》2023年第1期64-69,共6页Optical Technique

基　　金：国家自然科学基金(62205310);山西省自然科学基金(201901D211234)。

摘　　要：干涉法和补偿法等双折射测量方法需要转动待测样品或偏振元件,操作不便、测量速度慢、精度有限。提出了一种双弹光调制与上位机组成的双折射系统。由弹光调制来产生调制信号,加载待测样品信息,调制信号采集至上位机中进行数据处理,进一步完成延迟量和快轴方位角求解。对测试方案原理进行分析,重点进行了系统数据处理的上位机设计与实现,完成了软硬件系统搭建。采用1/4波片进行了实验测试,实验结果表明延迟量测量相对误差为2%,快轴方位角测量相对误差为0.4%,延迟量和快轴方位角的标准差分别为0.056nm和0.022°。Birefringence measurement methods such as interferometry and compensation need to rotate the sample or polarization element to be measured, which is inconvenient to operate, slow to measure and limited in accuracy.A birefringence measurement system composed of double photoelastic modulation and PC is proposed. The modulation signal is generated by the photoelastic modulation, the information of the sample to be tested is loaded, and the modulation signal is collected to the PC for data processing, so as to further complete the solution of the retardation and the fast axis azimuth angle.The principle of the test scheme is analyzed, and the upper computer design and implementation of the system data processing are emphasized, and the software and hardware system is built.The experimental results show that the relative error of delay measurement is 2%,and the relative error of fast axis azimuth measurement is 0.4%. The standard deviations of the retardation and fast axis azimuth angle are 0.056nm and 0.022°.

关 键 词：双折射 弹光调制 上位机设计 延迟量 快轴方位角 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]