Dynamic Fiber-Optic Shape Sensing Using Fiber Segment Interferometry
Dynamic Fiber-Optic Shape Sensing Using Fiber Segment Interferometry
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DOI：
10.1109/jlt.2017.2750759
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发表时间：
2018-02-15
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;Chehura, Edmond;Tatam, Ralph P.
动态光纤形状感测，通常也被称为曲率或弯曲感测，使用光纤段干涉法，其中由宽带布拉格光栅反射器分离的光纤段链，使用范围分辨干涉法进行询问。在本文中，使用光纤段的干涉曲率传感理论的详细开发，包括技术来推断从测量的差分应变数据和传感器的方向校准的方法的横向位移。进行概念验证实验，其中四个光纤串，每个光纤串包含四个光纤段，每个光纤段的标距长度为20 cm，被连接到柔性支撑结构的相对侧，并且所得到的差分应变测量值被用于确定0.8 m悬臂测试对象在两个维度上的横向位移。在21 kHz带宽上以40 nm.Hz（-0.5）噪声水平进行的动态尖端位移测量表明，这种方法适用于高灵敏度和高成本效益的光纤横向位移或振动测量。
Dynamic fiber-optic shape sensing, often also referred to as curvature or bend sensing, is demonstrated using fiber segment interferometry, where chains of fiber segments, separated by broadband Bragg grating reflectors, are interrogated using range-resolved interferometry. In this paper, the theory of interferometric curvature sensing using fiber segments is developed in detail, including techniques to infer lateral displacements from the measured differential strain data and methods for directional calibration of the sensor. A proof-of-concept experiment is performed, where four fiber strings, each containing four fiber segments of gauge length 20 cm each, are attached to the opposing sides of a flexible support structure and the resulting differential strain measurements are used to determine the lateral displacements of a 0.8 m cantilever test object in two dimensions. Dynamic tip displacement measurements at 40 nm.Hz(-0.5) noise levels over a 21 kHz bandwidth demonstrate the suitability of this approach for highly sensitive and cost-effective fiber-optic lateral displacement or vibration measurements.