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长周期光纤光栅应变和温度传感灵敏度研究
引用本文:张志荣,张冠茂,张晓萍.长周期光纤光栅应变和温度传感灵敏度研究[J].光子学报,2009,38(1):103-106.
作者姓名:张志荣  张冠茂  张晓萍
作者单位:1. 河西学院,物理系,甘肃,张掖,734000;兰州大学,信息科学与工程学院,兰州,730000
2. 兰州大学,信息科学与工程学院,兰州,730000
基金项目:教育部新世纪优秀人才支持计划,兰州大学信息科学与工程学院青年科研基金 
摘    要:基于模耦合理论,从长周期光纤光栅在外加轴向应变或环境温度变化时可能出现的弹性形变、弹光效应、热光效应、热膨胀效应及波导效应入手,推导了描述其轴向应变和温度灵敏度的一般性公式.利用数值方法研究了光栅周期、耦合模式的阶次、弹光系数及热光系数对灵敏度的影响.结果表明:在相同条件下,增大光栅周期将是提高灵敏度的有效手段之一;低次模较高次模的耦合具有更高的灵敏度;包层与芯区的弹光系数(热光系数)相等时,波长漂移量很小且与谐振波长值有简单的正比关系.

关 键 词:长周期光纤光栅  传感器  应变  温度  灵敏度
收稿时间:2007-07-26
修稿时间:2007-09-28

Strain and Temperature Sensitivities of Long Period Fiber Grating
ZHANG Zhi-rong,ZHANG Guan-mao,ZHANG Xiao-ping.Strain and Temperature Sensitivities of Long Period Fiber Grating[J].Acta Photonica Sinica,2009,38(1):103-106.
Authors:ZHANG Zhi-rong  ZHANG Guan-mao  ZHANG Xiao-ping
Institution:1 School of Information Science & Engineering;Lanzhou University;Lanzhou 730000;China;2 Department of Physics;Hexi University;Zhangye;Gansu 734000;China
Abstract:Based on mode coupling theory,and considering the physics effect that can be resulted from strain or temperature which affected on long-period fiber grating,such as elastic distortion,strain-optic effect,thermal expansion,thermo-optic effect et al.,the general formula of strain and temperature sensitivities of it were obtained.Computer was used to simulate the relation of sensitivities with the period of LPFG,the order of mode,elastic-optic coefficient and thermo-optic coefficient.The results show that increasing the period of grating or utilizing coupling of the lower order mode will obtain higher sensitivities,and when elastic-optic coefficient(thermo-optic coefficient) of the cladding and core equals,the wavelength shift is very small and in simple direct proportion to resonance wavelength.It will provide some sort of guidance for practical application of sensor based on LPFG.
Keywords:Long Period Fiber Grating(LPFG)  Sensor  Strain  Temperature  Sensitivities
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