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本文提出并展示了两种光纤超声传感系统,一种是基于菲索干涉仪的结构,另一种是类萨格奈克干涉仪的结构.当系统中光纤传感器采用长跨度光纤时,可实现结构整体内部是否有微裂纹所导致超声发射的情况监测.系统中的光纤传感器部分也可以选用一段短光纤或绕成一个光纤环,从而实现单点的局部探测.文中分析了作为传感的光纤与超声的相互作用.实验上,将1 m长的光纤作为一段直线传感器和绕成光纤环形点传感器分别埋入混凝土试件中,进行了10、25和50 kH超声测量实验.结果表明,这两种光纤传感器均具无损检测的应用潜力.尤其是长尺度光纤传感器更适合于监测大尺度混凝土建筑结构的由于内部微裂纹的发生及其发展情况,对于评估结构的健康状况具有十分重要的意义.
This paper presents and presents two kinds of optical fiber ultrasonic sensing systems, one is based on the structure of the Fizeau interferometer and the other is the structure of the Sagnac interferometer.When the optical fiber sensor in the system adopts long-span optical fiber, To achieve the whole structure of the internal microcracks caused by ultrasound emissions caused by monitoring the system part of the optical fiber sensor can also use a short fiber or wound into a fiber ring in order to achieve a single point of local detection.In this paper, as a sensing Optical fiber and ultrasonic interaction.In the experiment, 1 m long optical fiber as a straight line sensor and around the optical fiber ring point sensor were embedded in concrete specimens, 10, 25 and 50 kH ultrasonic measurements experiments.The results show that, Both of these fiber optic sensors have the potential for non-destructive testing, especially since long-range optical fiber sensors are more suitable for monitoring the occurrence and development of large-scale concrete structures due to internal microcracks and are important for evaluating the health of a structure significance.