Highly sensitive curvature sensor based on long period fiber grating with alternately splicing multiple single/multimode structure

作者：Hu, Qihao; Zhang, Shuo; Yang, Wenlei^*; Geng, Tao^*; Sun, Weimin; Sun, Cuiting; Jin, Xiren; Yuan, Libo

来源：Optical Fiber Technology, 2017, 37: 69-73.

DOI：10.1016/j.yofte.2017.07.005

• Long period fiber grating
• Curvature
• Splicing
• Optical fiber sensor

A highly sensitive curvature sensor made of a novel long period fiber grating (LPFG) is presented and experimentally demonstrated. It is constructed by splicing multiple single mode fibers (SMFs) and multi-mode fibers (MMFs) alternately (MS/MA). The measurement result shows that it has a high sensitivity of -22.4 nm/m(-1) in the range from 0.223 m(-1) to 4.358 m(-1). It can measure curvature on all direction due to the symmetric structure. The proposed sensor was also insensitive to the temperature, whose temperature sensitivity was around -0.015 nm/degrees C in the range from 40 degrees C to 200 degrees C. The advantages of high curvature sensitivity and low temperature sensitivity make it has a great potential to measure curvature in practical application with high resolutions.

• 出版日期2017-9
• 单位哈尔滨工程大学