光学
芯(光纤)
材料科学
光纤传感器
折射率
光纤
光强度
灵敏度(控制系统)
强度(物理)
波长
渐变折射率纤维
弯曲分子几何
单模光纤
梁(结构)
物理
工程类
复合材料
电子工程
作者
Guolu Yin,Fengchan Zhang,Bo Xu,Jun He,Yiping Wang
出处
期刊:Optics Express
[The Optical Society]
日期:2020-05-01
卷期号:28 (10): 14850-14850
被引量:15
摘要
A new optical fiber bend sensor is proposed and demonstrated based on a sandwich structure created by splicing a segment of twin core fiber (TCF) between two segments of single mode fibers (SMFs). One core of the TCF is aligned with the cores of two segments of SMFs. An incident beam is directed into the TCF by the lead-in SMF. Light couples back and forth between two cores. The bend sensing performance of the sensor is investigated by intensity-modulated method. The intensity of the operation wavelength is modulated by the change of refractive index and geometrical deformation in the bent TCF. Experimental results show such a bend sensor achieves sensitivity of +0.671 /m −1 and resolution of 0.003 m −1 in the range of 0 to 1.25 m −1 . In addition, the sensitivity and bend measurement range can be flexibly adjusted through selection of the length of TCF and sensing configuration. As such, the proposed sensor can be further developed for large or small bend ranges measurement.
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