一种确定光纤传感器中3×3耦合器输出信号相位差的新算法  

A new algorithm to determine the phase difference of the outputs of a 3x3 fiber-optic coupler

作　　者：崔杰[1] 刘亭亭[1] 肖灵[1] 陈德胜[2] 

机构地区：[1]中国科学院声学研究所医用声学实验室,北京100080 [2]中国科学院研究生院

出　　处：《应用声学》2008年第1期36-41,共6页Journal of Applied Acoustics

基　　金：国家自然科学基金(基金批准号60673152)资助项目

摘　　要：本文提出了一种基于Bessel函数展开，在频域内精确确定光纤传感器3×3耦合器输出信号相位差的算法。在Mach-Zehnder干涉仪原理的基础上，通过建立3×3耦合器输出信号的数学模型和利用耦合器输出光功率的Bessel展开，完成了算法的理论推导，并且在实验室中进行了声学实验。数据处理结果表明，该算法能够较精确地确定3×3耦合器输出信号的相位差，且相位差与调制频率无关，与理论相符。An algorithm based on the Bessel function is presented to obtain the phase difference of the outputs of a 3 ×3 fiber-optic coupler in frequency domain. Based on the Mach-Zehnder interferometer, the mathematics model of the 3×3 fiber-optic coupler＇s outputs is established, and on utilizing the model as well as expression of the Bessel function, theoretical derivation of the algorithm is given. The processed results of an acoustic experiment indicate that the algorithm is precise, and can be applied to any fiber optic sensor. The phase difference is found not to depend on the modulated frequency, that agrees with the theory.

关 键 词：光纤传感器3×3耦合器 BESSEL函数 相位差 算法 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]