一种新型测量旋光色散的方法.pdf

第38卷 第 4期 光学仪器 Vol. 38 ，No. 4 2016年 8 月 OPTICAL INSTRUMENTS August , 2016 文章编号：1005-5630(2016)04-0288-04 一种新型测量旋光色散的方法 李子骏，贾宏志 (上海理工大学光电信息与计算机工程学院，上海 200093) 摘要：提出了一种新的测量旋光色散的方法。该方法利用白光LED作为光源，经起偏棱镜、样 品管和检偏棱镜后，复色偏振光经平面衍射光栅分光后，由线阵CCD进行采集，CCD的每个像 元对应接收复色偏振光经分光后的某一波长的光信号，在检偏器旋转一周内，获得相应的光强 数据，使用拟合算法，对每一个像元所采集的光强数据逐一进行处理，最终得出CCD像元所对 应波长的旋光度，最后得到旋光色散数据。并利用标准石英管进行了实验研究，证明了这种测 量方法的可行??。 关键词：旋光色散；线阵CCD; 拟合算法 中图分类号：TH 741 文献标志码：A doi: 10. 3969/j. issn. 1005-5630. 2016. 04. 002 A new measurement method of optical rotatory dispersion LI Zijun , JIA Hongzhi (School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China) Abstract： This paper proposed a new method of measuring optical rotatory dispersion. The white LED is utilized as radiation source and after transmitting through polarizer, sample tube and analyzer, the composite polarized light is dispersed with transmission grating to obtain the optical rotatory dispersion, and the light intensity data are captured by a line-array CCD. Every single pixel of CCD captures one certain wavelength light from the transmission grating and obtains all data during the rotation of analyzer. Polynomial fitting algorithm is used to process the data captured by every single pixel of CCD. The optically active rotation angles versus CCD pixels numbers are finally obtained. By using the experimental device and standard quartz tube, we finally get the optical rotatory dispersion data of standard quartz tube. The experimental research proved the feasibility of this measuring method. Keywords：optical rotatory dispersion ； linear-array CCD ； polynomial fitting algorithm 引 言 旋光现象最早是由科学家Arago