摘要
提出并研制了一种结构简单、成本低廉的温度与应变同时测量系统,其结构是在保偏光纤Sagnac环内接入一个长周期光纤光栅(LPFG)。利用LPFG对保偏光纤Sagnac环的透射光谱进行调制,通过监测谐振峰波长和强度的变化,发现波长随温度和保偏光纤的应变变化,强度随LPFG的应变变化,因此可以实现温度与应变的区分测量,并且可判断出应变的施加位置。实验得到该系统的温度灵敏度为0.181 81nm.℃-1,LPFG区的应变灵敏度为0.005 283dB.με-1,保偏光纤Sagnac环区的应变灵敏度为0.015 72nm.με-1。实验结果表明该方案可行,并具有一定的实用性。
A simultaneous measurement system of temperature and strain is proposed and fabricated,which has advantages of low cost and easy structure.The system is formed by combining a long period fiber grating with a polarization-maintaining fiber Sagnac loop.The transmission spectrum of the fiber Sagnac interferometer is modulated by LPFG.The simultaneous measurement of temperature and strain can be realized.The experimental results show that the wavelength of the dip is varied with temperature changing and applied strain on polarization-maintaining fiber,and the intensity of the dip is changed with applied strain on LPFG.The temperature sensitivity of the system is 0.181 81 nm·℃-1,the strain sensitivity of LPFG is 0.005 283 dB·με-1,and the strain sensitivity of polarization-maintaining fiber Sagnac loop is 0.015 72 nm·με-1.The experimental system indicates that the proposal is feasible and has an application prospect.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2012年第9期2318-2321,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(61077060)
教育部科技创新工程重大项目(Z08119)
陕西省重大科技创新项目(2009ZKC01-19)资助
关键词
长周期光纤光栅
SAGNAC环
温度传感
应变传感
Long period fiber grating； Polarization-maintaining fiber Sagnac loop； Temperature sensing； Strain sensing；
