摘要
推导了布拉格光纤光栅传感器所测应变与实际结构应变的关系,得出了平均应变传递率并与实际试验结果进行比较.根据应变传递率确定了光纤的临界粘接长度,并推导了多层粘接时的应变传递情况,讨论了影响应变传递率的因素.结果表明,光纤光栅的粘贴长度必须大于临界粘贴长度,且光纤光栅传感器所测应变需要加以修正才能得到实际结构应变.
The relationship between the strains measured by a fiber Bragg grating sensor and the actual structural strains is deduced, then the average strain transfer rate computed by the formulation developed in this paper is compared with available experimental data. The critical adherence length of an optical fiber sensor is determined by a strain lag parameter, which contains both the effects of the geometry and the relative stiffness of the structural components. The analyses shows that the critical adherence length of a fiber sensing segment is the minimum length with which the fiber has to be tightly glued to a structure for adequate sensing. The strain transfer rate of an optical fiber sensor embedded in a multi-layered structure is developed in a similar way, and the factors that influence the efficiency of optical fiber sensor strain transferring are discussed. The analysis in this paper shows that the critical adherence length of fiber sensing segment could not be lower than a critical value and that the strains measured by fiber Bragg grating sensors should be modified to obtain the actual strains.
出处
《力学学报》
EI
CSCD
北大核心
2005年第4期435-441,共7页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(50408031
50438010)辽宁省科技基金(20032120
20042149)大连理工大学青年教师培养基金(893214)资助项目.~~
关键词
固体力学
应变传递
光纤光栅传感器
临界粘贴长度
solid mechanics, strain transfer, fiber Bragg grating sensors, critical adherence length