多光束激光外差测量磁致伸缩系数的方法  

Study on Magnetostrictive Coefficient Based on Multi-Beam Laser Heterodyne

作　　者：李彦超[1] 王春晖[1] 曲杨[1] 

机构地区：[1]哈尔滨工业大学光电子技术研究所可调谐激光技术国家级重点实验室,黑龙江哈尔滨150001

出　　处：《中国激光》2012年第B06期272-276,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金（61078061）和哈尔滨工业大学重大国际科技合作培育计划（HIT.ICRST.2010024）资助课题.

摘　　要：提出了一种多光束激光外差测量磁致伸缩系数的方法。基于激光外差技术和多普勒效应，把待测参数信息加载到外差信号的频率差中，通过对外差信号作快速傅里叶变换（FFT）解调后可以同时得到多个待测参数值，对待测参数加权平均处理最终可以提高待测参数的测量精度。利用Matlab仿真模拟了不同电流条件下待测样品的磁致伸缩系数，结果表明相对误差仅为0．48％。A method of multi-beam laser heterodyne measurement for magnetostrictive coefficient is proposed. Based on Doppler effect and heterodyne technology, loading the information of parameter under test to the frequency difference of the multi-beam laser heterodyne signal by the frequency modulation of the oscillating mirror, this method can obtain many values of parameter after the multi-beam laser heterodyne signal demodulation simultaneously. Processing these values by weighted-average, it can improve the accuracy of the parameter. The magnetostrictive coefficient of the sample under different carrents is simulated by Matlab. The obtained result shows that the relative error of this method is just 0.48 %.

关 键 词：测量 磁致伸缩系数 激光外差 多普勒效应 多光束干涉 

分 类 号：TN958[电子电信—信号与信息处理]