基于单模-多模-单模光纤模间干涉的传感系统  

Optical fiber sensing system based on multimode interference of single-mode-multimode-single-mode fiber structure

作　　者：李强[1,2] 黄泽铗[1,2] 徐雅芹[1,2] 张凌云[1,2] 史骥[1,2] 王智[1,2] 

机构地区：[1]北京交通大学理学院光信息科学与技术研究所,北京100044 [2]发光与光信息技术教育部重点实验室,北京100044

出　　处：《红外与激光工程》2014年第5期1630-1636,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(61077048);北京市自然科学基金(4132035);高等学校博士学科点专项科研基金(20120009110032);基本科研业务费(2009JBM103;2012JBM103);北京交通大学大学生创新训练项目

摘　　要：基于单模-多模-单模光纤(SMS)结构的模间干涉现象,在外界环境变化时SMS光纤结构输出光场散斑图样的变化规律,提出了一种用于振动、应力及温度检测的光纤传感系统。该系统使用光电二极管测量散斑图样部分固定区域的光功率变化,即可得到施加在多模光纤上的外界应力,通过FFT和Hilbert变换,可得到外界振动(频率、幅度)和温度变化信息。对该系统的振动测量和温度测量进行定标后,经实验研究测得,该系统振动测量误差小于0.7Hz,温度测量误差小于5.0%。该系统结构简单,成本低,并可用于多参量的测量。In this article, we proposed an optical fiber sensing system for measuring vibration, strain and temperature based on the multimode interference of single- mode- multimode- single- mode （SMS） fiber structure, because the output optical power of the SMS fiber structure changed with the external environment parameters, such as vibration （frequency and amplitude）, strain and temperature. From the variation of the output optical power, the strain on the multimode fiber could be obtained. The frequency and amplitude of the vibration and temperature of the SMS fiber structure could be obtained when FFT or Hilbert transformation was employed. With the calibration of the system, some cases of vibration and temperature change were measured with the error of less than 0.7 Hz and 5.0%, respectively. The SMS optical fiber sensing system can be used for multi- parameter measurements with extremely simple structure and low cost.

关 键 词：光纤传感 SMS光纤结构 模间干涉 应力 振动 温度 

分 类 号：TN253[电子电信—物理电子学]