一种高灵敏度浓度传感解调技术  

A High Sensitivity Concentration Sensing Demodulation Technique

作　　者：赵洪霞[1] 丁志群[1] 王金霞[1] 方晓惠[1] 贾辉[1] 鲍吉龙[1] 

机构地区：[1]宁波工程学院电子与信息工程学院,浙江宁波315016

出　　处：《中国激光》2010年第5期1294-1297,共4页Chinese Journal of Lasers

基　　金：宁波市自然科学基金项目(2009A610067)资助课题

摘　　要：长周期光纤光栅(LPFG)传感器具有非常广泛的应用价值,低成本、高精度解调技术是实用化的关键。利用全反射特性的光纤环形镜和2根LPFG构成干涉仪,采用法布里-珀罗(F-P)可调滤波器对某级干涉小峰进行波长扫描,借助探测器和示波器对信号光波在驱动信号周期内所形成的两负脉冲间隔进行测量,实现信号解调。利用此系统对质量浓度从0到饱和的蔗糖溶液进行测量,测得系统传感灵敏度的实验值为0.04 ms.L/g。There are wide range of potential applications about long period fiber grating（LPFG）,in order to utilize LPFG as sensing element,it is necessary to develop low cost and high precision wavelength demodulation schemes.An high sensitivity technique for LPFG sensor signal demodulation is introduced.A interferometer based on fiber ring mirror and two LPFGs are designed,the wavelength-shift of sensor grating affected by the measured concentration is converted into variation of time-interval between negative-going pulses that is scanning by F-P tunable filter controlled by PZT.The experiment results show that the sensing sensitivity of this system is 0.04 ms·L /g,with the sucrose solution concentration being from 0 to saturated.

关 键 词：传感技术 解调 长周期光纤光栅 光纤环形镜 F-P可调滤波器 

分 类 号：TN253[电子电信—物理电子学] TP212.14[自动化与计算机技术—检测技术与自动化装置]