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分布式光纤传感技术对大型混凝固结构,如大坝与桥梁,进行裂缝监测意义重大,其分布式检测能力对具有强随机性的大坝裂缝监测效果更显著。一种新型分布式光纤传感器埋入混凝土并与预期裂缝相交一定斜角,当裂缝出现引起光纤局部微弯,并诱发瑞利散射光产生衰减,用光时域反射技术实现分布式检测。将该种传感器用于四川石棉冶勒大坝裂缝监测,结果表明:该光纤传感器不仅对裂缝宽度、位移具有高分辨率(0.02mm)、大动态范围(4.8mm),而且有较高的定位分辨率(0.2m),为发展该类分布式光纤传感监测系统提供了较好的技术基础。
Distributed optical fiber sensing technology is of great significance to the monitoring of large-scale coagulated solid structures, such as dams and bridges, and its distributed detection capability is more effective for dam cracks monitoring with strong randomness. A new type of distributed optical fiber sensor is embedded in concrete and intersects with the expected crack at an oblique angle. When the crack occurs, the optical fiber is slightly bends and the Rayleigh scattering light is induced to decay. Distributed optical fiber time domain reflectometry is used for distributed detection. The results show that this sensor not only has high resolution (0.02mm) and large dynamic range (4.8mm) for crack width and displacement, but also has higher positioning Resolution (0.2m), for the development of such distributed optical fiber sensing monitoring system provides a good technical basis.