摘要
高温应变是材料和结构在高温环境中物理性能的主要参数之一,对高温应变的准确测量是结构热强度试验的重要组成部分。目前在高温应变测量方面存在安装工艺复杂、耗费时间长、测量分散性大、高温胶造成应变传递误差、热输出标定带来二次误差等不足。本文将光纤温度/应变复合传感器应用到热强度试验中,该传感器结合布拉格光栅光纤传感器和非本征法珀传感器,可以同时测量同一点的温度和应变。该传感器具有不依赖高温胶传递应变,不需要标定热输出等优点。当前已实现了800℃环境下温度和应变的测量。试验结果证明,传感器性能稳定,一致性良好。
High temperature strain is one of the key physical parameters in material and components under elevated temperature environments.With the development in the aerospace fields,the measurement of high temperature strain during the thermal structure test requires higher accuracy than ever before.However,conventional resistance strain gauge is hard to meet the requirements due to its various defects of complicated and low efficiency configuration process,high scattering brut data,glue induced transmission error and thermal output validation test error.This work is devoted to developing a novel integrated temperature/strain sensor based on combination of optical fibre Bragg Grating and extrinsic FP cavity,which is unnecessary to compensate the thermal output and without glue related strain transmission error.At present,temperature and strain measurement at 800℃has been achieved.Results show that the sensor is stable and consistent.
作者
柴葳
郝庆瑞
宝剑光
Chai Wei;Hao Qingrui;Bao Jianguang(China Aircraft Strength Research Institute,Xi’an 710065,China;The University of Nottingham,Nottingham,UK)
出处
《航空科学技术》
2020年第2期66-71,共6页
Aeronautical Science & Technology
基金
航空科学基金(2016ZD23015)。
