郭新春,宁提纲,李晶,李超.基于偏芯结构的光纤弯曲传感器及其特性研究[J].光电子激光,2014,(8):1476~1480 |
基于偏芯结构的光纤弯曲传感器及其特性研究 |
Fiber-optic curvature sensor based on a core-offset structure |
投稿时间:2014-03-26 |
DOI: |
中文关键词: 偏芯熔接(COJ) 弯曲传感器 包层模 马赫-曾德尔(MZ)干涉仪 |
英文关键词:core-offset jointing (COF) curvature sensor cladding mode Mach-Zehnder (MZ ) interferometer |
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中文摘要: |
提出了一种基于偏芯熔接(COJ)结构的光纤弯曲传 感器。传感器利用COJ结构,将部分纤芯光耦合 到包层中形成包层模,在输出端与纤芯模进行耦合形成干涉,并通过探测输出光谱的 波长漂移对 曲率进行探测。理论和实验表明,本文结构的弯曲传感器具 有较好的弯曲灵敏度以及较好的线性响应曲线,对长为55.6mm的传 感器,其弯曲灵敏度为-6.9nm/m-1;传感器长度会影响传 感器的弯曲灵敏度,长度越长,弯曲灵敏度越大。 |
英文摘要: |
A fiber-optic curvature sensor based on a core-offset structure has been proposed and demonstrated in this paper.Here two core-offset jointing points have been inserted in the sens or.The first core-offset jointing point is used to excite the cladding modes and the second one is used as the in terference point.We fix the core-offset structure based curvature sensor by two fiber h olders which can be controlled precisely to control the bending curvature of the sensor.The fiber holder is a djusted for 20μm per time with the total adjusted distance of 200μm in this experiment.The experimental results s how that the curvature sensor is very sensitive to bending change and the transmission spectrum of the sensor wil l shift to blue wavelength with the increasing of the bending curvature.The measured curvature sensitivity is -6.9nm/m-1 with the sensor length of 55.6mm.In order to study the influence of the fiber length,we fabricated three sensors with different fiber lengths.The experimental results show that the curvature sensitivity can be influenced by the length of the sensor and the curvature sensitivity will be increased with the increasing of the length o f the sensor. |
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