Method and Theory for a Multi-Gauge Distributed Fiber Optic Crack Sensor
Method and Theory for a Multi-Gauge Distributed Fiber Optic Crack Sensor
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DOI：
10.1177/1045389x9901000402
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发表时间：
1999-02
影响因子：
2.7
通讯作者：
X. Gu;Zhongyu Chen;F. Ansari
中科院分区：
文献类型：
--
作者：
X. Gu;Zhongyu Chen;F. Ansari
研制了一种用于复合材料裂纹检测和裂纹宽度测量的分布式传感器。该传感器由一条线上的许多单独的部分组成，根据结构和材料要求设计测量长度。相邻段间界面处回波损耗测量为裂缝检测和测量提供了依据。采用光时域反射计（OTDR）对传感器信号进行检测。将准分布式传感器嵌入钢筋混凝土梁中，评估其裂缝检测能力。试验包括单调载荷和疲劳载荷。传感器被嵌入混凝土梁的受拉区，以便于传感器响应与视觉裂缝观测的比较。给出并讨论了该方法在裂纹检测能力和分辨率方面的实验结果。
A distributed sensor is developed for detection of cracks and measurement of crack widths in composite materials. The sensor consists of a number of individual segments on one line with gauge lengths designed according to the structural and materials requirements. Return loss measurements at the interfaces between adjoining segments provide the basis for crack detection and measurement. An optical time domain reflectometer (OTDR) is employed for interrogation of the sensor signal. The quasi-distributed sensors were embedded in reinforced concrete beams in order to evaluate their crack detection capability. Experiments involved both monotonic as well as fatigue loading. The sensors were embedded in the tension zone of the concrete beams in order to facilitate comparison of sensor response with visual crack observations. Experimental results in terms of crack detection capability and resolution are presented and discussed.