Wang Senyu, Ma Yiwei, Geng Tao, Sun Cuiting, Zhu Hongjia, Li Xiaoyang, Yi Yang, Zhang Shuo, Sun Weimin, Yuan Libo
Opt Lett. 2020 Aug 1;45(15):4156-4159. doi: 10.1364/OL.391593.
In this Letter, a novel, to the best of our knowledge, parallel inclined planes long period fiber grating (PIP-LPFG) for strain measurement is proposed. This structure is fabricated by a high frequency laser, which has polished periodic parallel inclined planes on a single mode fiber (SMF). Refractive index modulation (RIM) over a large area on the surface of the SMF significantly shortens the total length of the grating, and the structure of parallel inclined planes efficiently enhance the strain sensitivity of PIP-LPFG. Experimental results show that this LPFG with a miniature length of 3.9 mm has a good repeatability and stability of strain response, which can reach to 116 pm/µε in the dynamic range of 0-425 µε. Meanwhile, the temperature sensitivity of PIP-LPFG is 54.7 pm/°C in the dynamic range of 30-170°C.
在本信函中，据我们所知，提出了一种用于应变测量的新型平行倾斜平面长周期光纤光栅（PIP-LPFG）。这种结构由高频激光制造，在单模光纤（SMF）上加工出周期性的平行倾斜平面。单模光纤表面大面积的折射率调制（RIM）显著缩短了光栅的总长度，并且平行倾斜平面结构有效地提高了PIP-LPFG的应变灵敏度。实验结果表明，这种长度仅为3.9 mm的微型长周期光纤光栅在应变响应方面具有良好的重复性和稳定性，在0 - 425 με的动态范围内，应变灵敏度可达116 pm/με。同时，在30 - 170°C的动态范围内，PIP-LPFG的温度灵敏度为54.7 pm/°C。
