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Plastic Optical Fiber Displacement Sensor for Cracks Monitoring

机译：用于裂缝监测的塑料光纤位移传感器

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摘要

In the following we present a low-cost optical system for cracks evolution monitoring. The transducer principle is based on the variation of light transmitted between two facing fibers with their axial distance, exploiting the unique light-collecting capabilities of large-core polymer optical fibers. The characterization shows that the working range of the transducer is up to 3.5cm, with a resolution of 10μm and a repeatability of 5μm. With our current custom-developed control unit, up to four transducers can be arranged to provide a multi-axial displacement sensor or to simultaneously monitor four points for distributed sensing. A closed-loop light modulation/detection scheme is implemented to reduce the environmental noise sensitivity. The control unit is interfaced to a PC via USB port or via GSM/GPRS modem to automatically send periodical reports of the measurements and to issue warnings in case of displacements above a given threshold. Extensive tests in an environmental chamber have been carried out in order to extract calibration curves and to compensate for day-night and summer-winter temperature fluctuations.
机译：在下文中，我们提出了一种用于裂缝监测的低成本光学系统。换能器原理基于两根相向光纤之间传输的光随其轴向距离的变化，并利用了大芯聚合物光纤的独特集光能力。表征表明，传感器的工作范围可达3.5cm，分辨率为10μm，重复性为5μm。使用我们当前定制开发的控制单元，最多可以布置四个传感器，以提供多轴位移传感器或同时监视四个点以进行分布式传感。实施闭环光调制/检测方案以降低环境噪声灵敏度。控制单元通过USB端口或GSM / GPRS调制解调器连接到PC，以自动发送定期的测量报告，并在位移超过给定阈值的情况下发出警告。为了提取校准曲线并补偿白天和夏季冬季的温度波动，已经在环境室内进行了广泛的测试。

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