基于滤波处理旋光仪的优化设计  

Based on Filter Processing Polarimeter Optimization Design

作　　者：王芳[1,2] 王超群[1] 王旭[1,2] 张软玉[1] 刘玉芳[1,2] 

机构地区：[1]河南师范大学物理与电子信息工程,河南新乡453007 [2]河南省红外光电子科学与技术重点实验室培育基地,河南新乡453007

出　　处：《光电子技术》2013年第2期117-120,共4页Optoelectronic Technology

基　　金：国家自然科学基金资助项目(61127012)

摘　　要：针对目前运用光电探测器技术测量旋光角精确度偏低的问题,在原有的旋光仪的基础上运用磁光调制偏振光对仪器进行优化设计。该设计可使光电探测器测量的信号分成三种成分。采用TMS320F2812DSP芯片,先对光电探测器的输出信号进行A/D处理。运用两个Butterworth滤波器将信号中的基频信号和倍频信号分离出来。分别求两个信号的平均功率进一步换算处理,从而得到精确的旋光角度值。实验结果分析,此系统测量角度可低至0.001°,测量溶液浓度可低至2mg/ml以下。降低了仪器对光电探测器的精度要求,提高了角度测量的精度。To solve the problems of low accuracy of the current photoelectric detector technique to measure the angle of rotation. , the magneto optic modulation polarized light is used to optimize the design based on the original polarimeter. The signal of the photoelectric detector is divided into three components. The instrument adopts the TMS320F2812 DSP chip. First, the output signal of the photoelectric detector is A/D processed. Two Butterworth filter are used in the frequency signal and the multiple frequency signal separation. After the two signal average power further conversion is processed, the exact value of the rotation angle is obtained. The analysis of experimental results shows thatmeasuring angles can be as low as 0. 001and measuring concentration of the solution can be less than 0. 002g/ml. The require of the photoelectric detector accuracy is reduced, and the measurement accuracy is increased.

关 键 词：旋光效应 磁光调制 Matlab-Simulink仿真 数字信号处理 

分 类 号：TH712[机械工程—测试计量技术及仪器]