摘要
目的研究自行开发的管式FBG应变传感器自身的应变传递率影响因素及相应的应变传递误差规律,为FBG应变传感器的设计与开发提供参考.方法采用有限元方法对封装的光纤光栅传感器进行应变传递分析.结果参考光纤、保护层、黏结层和封装材料之间的内部应变传递率和封装后的应变传感器外部保护层与基体材料之间的外部应变传递率是影响光纤光栅(FBG)应变传感器的应变灵敏度系数的两个决定因素.当封装钢管的直径和壁厚一致(胶层厚度一致)的情况下,胶黏剂的弹性模量越大,光纤的平均应变越小,变化非常明显,胶黏剂弹性模量分别为1.0×102MPa和2.0×103MPa时,钢管应变最大相差263μm.结论封装长度越长、胶粘剂的弹性模量越大,应变传递率越大.
For a self-made tube-packaged FBG （fiber Bragg grating） strain sensor, the influencing factors of strain transfer ratio and the corresponding error transfer law with finite element method are studied, From the numerical analysis result, comparing to the interior strain transfer ratio among fiber, coating, adhesive layer and encapsulation, the exterior strain transfer ratio between outer protecting layer and host material are the determinant factors of strain sensitivity coefficient. Also some influencing rules of critical adherence length, Young＇s modulus and epoxy adhesive layer thickness are obtained. Thus, advice and references are provided for design and exploitation of FBG strain sensor.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2007年第6期881-885,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(50408031)
中国博士后科学基金项目(20070410349)
建设部科技项目(2007-K3-15)
辽宁省教育厅项目(20060711)
关键词
光纤光栅
应变传感器
应变传递率
影响因素
fiber Bragg grating
strain sensor
strain transfer ratio
influencing factor
