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利用光纤光栅(FBG)传感器对基体表面应变进行测量,通常利用胶粘剂将光纤光栅传感器粘贴在基体表面,使其与基体协调变形。但胶粘剂在不同表面的粘接性能不同,对应变测量所造成的影响也就存在差异。针对这一问题,本文通过实验,简化应变传递模型,对比FBG传感器粘贴在等强度梁以及标准树脂试件的应变测量结果。结果表明:胶粘剂在基体表面的剪切强度越大,表面粘贴式FBG传感器的应变传递系数也越大。
Fiber grating (FBG) sensors are used to measure the strain on the surface of the substrate. The fiber grating sensor is usually bonded to the surface of the substrate with an adhesive to coordinate deformation with the substrate. However, the adhesive on different surfaces of different adhesive properties, the impact of the strain measurement there are differences. In response to this problem, this paper simplifies the strain transfer model by experiment and compares the strain measurement results of FBG sensors attached to isosceles beams and standard resin specimens. The results show that the greater the shear strength of the adhesive on the surface of the substrate, the greater the strain transfer coefficient of the surface-mounted FBG sensor.