摘要
针对低温结构应变难以精确可靠测量的问题,采用两端粘贴工艺制备了耐低温胶封装FBG应变传感器并通过低温单轴拉伸试验研究了其应变响应特性,理论推导了考虑光纤热光系数的温度补偿算法并通过低温温度响应试验分析了其准确性,最后应用于LNG球阀球体低温应变测量。封装工艺不改变FBG反射光谱形状,低温下传感器呈良好线性、重复性和稳定性,温度补偿算法有效提高了温度变化引起的应变测量精度,实现了低至液氮温区的球体应变监测。研究表明,耐低温胶封装FBG应变传感器结合考虑热光系数的温度补偿算法为LNG球阀等低温结构的应变测量提供了一种有效方法。
Given the difficulty of accurately and reliably measuring the structural strains at cryogenic temperatures,the fiber Bragg grating(FBG)strain sensors were packaged by fixing on both sides of the FBG element using an adhesive for cryogenic-temperature applications,and their response to strains was characterized by uniaxial tensile testing at cryogenic temperatures.A temperature compensation algorithm of FBG using the thermo-optic coefficient was theoretically investigated,and its accuracy was verified by temperature testing at cryogenic temperatures.Finally,they were applied to measure the strains in the ball of the LNG ball valve at cryogenic temperatures.The property of the FBG strain sensors indicated good linearity,repeatability,and stability at cryogenic temperatures,without showing obvious variations in the shape of the spectral response after the adhesive packaging.The temperature compensation algorithm effectively improved the accuracy of the measurement of strains induced by temperature changes.The strain monitoring of the ball of the LNG ball valve was achieved at the temperature down to the temperature of liquid nitrogen.The results demonstrate that the adhesive-packaged FBG strain sensors with the temperature compensation using thermo-optic coefficient provide an effective method for measuring strains in equipment such as LNG ball and so on at cryogenic temperatures.
作者
王雅莉
徒芸
涂善东
于新海
郭永宁
任利杰
陈时健
WANG Ya-li;TU Yun;TU Shan-dong;YU Xin-hai;GUO Yong-ning;REN Li-jie;CHEN Shi-jian(Key Laboratory of Pressure Systems and Safety(Ministry of Education),School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;SUFA Technology Industry Co.,Ltd.,CNNC,Suzhou 215001,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2023年第6期26-33,共8页
Instrument Technique and Sensor
基金
国家自然科学基金(52075175,52130511)
国家重点研发计划(2021YFB3702200)。
关键词
光纤布拉格光栅
温度补偿
参考光栅
胶封装
应变测量
低温
LNG球阀
fiber Bragg grating(FBG)
temperature compensation
reference grating
adhesive packaging
strain measurement
cryogenic temperature
LNG ball valve
