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埋入式封装的光纤光栅传感器应变传递分析
引用本文:李东升,李宏男.埋入式封装的光纤光栅传感器应变传递分析[J].力学学报,2005,37(4):435-441.
作者姓名:李东升  李宏男
作者单位:大连理工大学土木水利学院海岸和近海工程国家重点实验室,116023
基金项目:国家自然科学基金(50408031,50438010),辽宁省科技基金(20032120,20042149)和大连理工大学青年教师培养基金(893214)资助项目.
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.

关 键 词:固体力学  应变传递  光纤光栅传感器  临界粘贴长度  
文章编号:0459-1879(2005)04-0435-07
收稿时间:2004-04-25
修稿时间:2005-01-27

Strain transferring analysis of embedded fiber bragg grating sensors
Li Dongsheng,Li Hongnan.Strain transferring analysis of embedded fiber bragg grating sensors[J].chinese journal of theoretical and applied mechanics,2005,37(4):435-441.
Authors:Li Dongsheng  Li Hongnan
Abstract: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.
Keywords:solid mechanics  strain transfer  fiber Bragg grating sensors  critical adherence length
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