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为探讨分布式光纤传感器探测混凝土构件的应力、应变以及内部裂缝分布的效果,对2m标准试验梁进行试验.运用光纤内布里渊散射光频率与应变呈线性关系的原理,用埋入式光纤形成传感器.配置了分布式光纤传感器的混凝土试验梁,置于万能拉压试验机做力学试验.采用光纤解析仪泵浦激光,注入探测光,检测散射光,自动分析采样数据.用传统的应变片做对比研究.试验检验了两种光纤传感器,分别为GFRP光纤智能筋和裸光纤.研究结果表明:两种光纤都能有效测量混凝土应变并感知裂缝,裸光纤比智能筋更加灵敏.
In order to investigate the effects of distributed optical fiber sensors on the stress and strain and the distribution of internal cracks in concrete members, a 2m standard test beam was tested.Using the principle of linear relationship between the optical frequency and strain of the fiber's internal Brillouin scattering, Forming a sensor.Concrete test beam with distributed optical fiber sensor is placed in universal tensile testing machine to do the mechanical test.The optical fiber analyzer pump laser, injecting probe light, detecting scattered light, analyzing the sample data automatically.Using the traditional strain Two kinds of optical fiber sensors were tested, which are GFRP optical fiber and naked optical fiber respectively.The results show that both optical fibers can effectively measure the concrete strain and perceive cracks, and the bare optical fiber is more sensitive than smart bars.