Fiber Segment Interferometry for Dynamic Strain Measurements
Fiber Segment Interferometry for Dynamic Strain Measurements
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DOI：
10.1109/jlt.2016.2530940
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发表时间：
2016-10-01
影响因子：
4.7
通讯作者：
Tatam, Ralph P.
中科院分区：
文献类型：
--
作者：
Kissinger, Thomas;Correia, Ricardo;Tatam, Ralph P.
使用一种新的距离分辨干涉信号处理技术的基础上的正弦光学频率调制的成本效益的激光二极管，光纤传感方法称为光纤段干涉（FSI）的描述。在FSI中，一系列长标距光纤应变传感器由相同的光纤内部分反射器分开。针对结构健康监测的动态应变分析和超声检测，这种方法允许沿沿着光纤段进行集成应变测量，消除了传感间隙和对局部光纤传感器发现的不均匀性的敏感性。在本文中，六个光纤段，每个长度为12.5厘米，复用，演示。传感器阵列可以以98 kHz的数据速率进行询问，实现动态应变噪声水平
Using a novel range-resolved interferometric signal processing technique based on the sinusoidal optical frequency modulation of a cost-effective laser diode, a fiber sensing approach termed fiber segment interferometry (FSI) is described. In FSI, a chain of long-gauge length fiber optic strain sensors are separated by identical in-fiber partial reflectors. Targeted at dynamic strain analysis and ultrasound detection for structural health monitoring, this approach allows integrated strain measurements along fiber segments, removing the sensing gaps and sensitivity to inhomogeneities found with localized fiber sensors. In this paper, the multiplexing of six fiber segments, each of length 12.5 cm, is demonstrated. The sensor array can be interrogated at 98 kHz data rate, achieving dynamic strain noise levels