摘要
光纤光栅(Fiber Bragg Grating,FBG)的温度与应变交叉敏感问题在实际工程应用中至关重要。本文提出了一种采用级联FBG的法布里-珀罗(FBG-Fabry-Perot,FBG-FP)传感器进行温度与应变同时测量的方法。级联FBG阵列由氩离子紫外激光器基于相位掩模板方法制作,其形成的FP干涉峰和光栅反射谱包络可以实现温度与应变的解耦。在不同的温度条件下,由FBG-FP反射谱包络10 dB带宽所对应中心波长值可得FBG-FP的温度灵敏度系数为9.5 pm/℃。分别在无应力、有应力且恒温条件下,通过解读FP干涉峰的波长变化得到该级联FBG-FP的温度和应变灵敏度系数分别为9.1 pm/℃和1.03 pm/με。实测的温度与应变值可由干涉峰波长、反射谱包络与温度、应变的函数关系求得。结果表明该FBG-FP可以实现温度与应变的同时测量。
Temperature and strain cross-sensitivity of Fiber Bragg Grating(FBG)is critical in practical engineering applications.In this paper,a method for simultaneous temperature and strain measurement using Fabry-Perot cavity(Fiber Bragg Grating-Fabry-Perot,FBG-FP)sensors in cascaded fiber Bragg grating array is proposed.Cascaded FBG arrays are fabricated by UV laser based on phase mask method,which results in Fabry-Perot interference peak and grating reflection spectrum.Under different constant temperature conditions,the temperature sensitivity coefficient of FBG-FP can be obtained from the center wavelength value corresponding to the 10 dB bandwidth of the FBG-FP reflection spectrum as 9.5 pm/°C.The temperature and strain sensitivity coefficients of FBG-FP are 9.1 pm/℃and 1.03 pm/μεrespectively,obtained by interpreting the wavelength changes of the FP interference peaks under unstressed and stressed conditions as well as constant temperature.The temperature and strain values in practical measures can be obtained from the function relationship between interference peak wavelength,reflection spectrum envelope and temperature and strain.The results show that the FBG-FP can achieve simultaneous temperature and strain measurements.
作者
钱昱名
张钰民
孙亚丽
吴越
庄炜
祝连庆
QIAN Yu-ming;ZHANG Yu-min;SUN Yan-li;WU Yue;ZHUANG Wei;ZHU Lian-qing(Optical Fiber Sensing and Systems Beijing Laboratory,Beijing University of Science and Technology Information Beijing 100016,China;Beijing Key Laboratory of Photoelectric Testing Technology,Beijing University of Science and Technology Information,Beijing 100192,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2023年第3期424-430,共7页
Laser & Infrared
基金
国家自然科学基金重点项目(No.61735002)
北京市自然科学基金面上项目(No.4212048)
北京信息科技大学师资补充与支持计划(2019-2021)项目(No.5029011103)资助。
