Innovative Optical Fiber Sensors for Civil Infrastructure Systems

9411387冯计划对用于监测民用基础设施系统的新型光纤传感器进行实验研究。 光学传感器采用振动线，其张力可以通过外力、应变或振动进行调制，并转换为线振动频率的变化。 通过经由光纤电缆发送到线和从线反射的光来检测线振动频率。 与其他现有的光纤传感器相比，这些传感器往往缺乏可靠性和鲁棒性，传感器具有两个显著的优点：一是传感头是振动线（而不是光纤），可以感测特定的物理量而不会受到杂项效应的干扰;另一个是线振动是一种很好理解的物理现象。 事实上，具有高水平的可靠性，它的频率是光学测量的，并通过光纤传输到记录和其他设备，没有衰减或失真。 这些优点应使传感器系统简单，可靠和鲁棒，因此更容易部署在民用基础设施的应用。

9411387 Feng Experimental research of new optical fiber sensors for monitoring civil infrastructure systems is planned. Optical sensors employ a vibrating wire whose tension can be modulated by external force, strain, or vibration and is translated into the change in the wire vibration frequency. The wire vibration frequency is detected by light sent to and reflected from the wire through an optical fiber cable. Compared to other existing optical fiber sensors which tend to suffer from the lack of reliability and robustness, the sensors have two significant advantages: one is that the sensing head is a vibrating wire (rather than an optical fiber), which can sense a specific physical quantity without interference from miscellaneous effects: the other is that the wire vibration is a well understood physical phenomenon. In fact, with a high level of reliability, its frequency is optically measured and transmitted to recording and other devices through the optical fiber without attenuation or distortion. These advantages should make the sensor system simple, reliable and robust, and hence more readily deployable in civil infrastructure applications.