基于长周期光纤光栅和Sagnac环的温度与折射率的区分测量  

Simultaneous measurement of temperature and refractive index based on LPFG and Sagnac loop

作　　者：邵敏[1] 乔学光[2] 傅海威[3] 兆雪[3] 高宏[3] 刘钦朋[3] 

机构地区：[1]西北工业大学理学院陕西省光信息技术重点实验室,陕西西安710072 [2]西北大学物理系,陕西西安710069 [3]西安石油大学理学院光电油气测井与检测教育部重点实验室,陕西西安710065

出　　处：《光电子．激光》2012年第8期1442-1446,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61077060);教育部科技创新工程重大(Z08119);陕西省重大科技创新(2009ZKC01-19)资助项目

摘　　要：利用长周期光纤光栅(LPFG)和保偏光纤(PMF)Sagnac环透射光谱的调制特性,设计了温度和折射率同时区分测量系统。通过监测LPFG嵌入Sagnac环的透射谱中谐振峰波长和强度的变化,测定了波长和强度对温度和折射率的灵敏度系数,构建了传感系数矩阵。实验发现,谐振峰波长随温度变化,谐振峰强度随折射率变化,实现了温度与折射率的区分测量。实验测得该系统的温度灵敏度0.1 286nm/℃,折射率灵敏度为49.38dB/RIU。实验结果验证了方案的正确性,且实验系统搭建简便,体积小,成本低,具有一定的应用前景。A simultaneous measurement system for temperature and refractive index is proposed using a long period fiber grating （LPFG） and a polarization maintaining fiber （PMF） Sagnac loop, based on which the transmission spectrum of the fiber Sagnac interferometer is modulated by the LPFG. Through measuring the wavelength shifts and the intensity changes of a resonance dip of the system, the wavelength and the intensity response sensitivities to temperature and refractive index are obtained, and the sensitivity coefficient matrix is constructed. The experimental results show that the wavelength of the dip varies with temperature and the intensity of the dip changes with refractive index The temperature sen- sitivity of the system is 0. 128 57 nm/℃ ,and the refractive index sensitivity of LPFG is 49. 380 32 dB/ RIU. The experimental system is small and easy to set up, whose cost is relatively low and it has good application prospect.

关 键 词：光纤Sagnac环 长周期光纤光栅(LPFG) 保偏光纤(PMF) 折射率传感器 

分 类 号：TN253[电子电信—物理电子学]