Compact fiber strain sensor fabricated by a CO2 laser

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 CO2 laser, which has polished periodic parallel inclined planes on a single mode fiber (SMF). Refr...

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Bibliographic Details
Published in:Optics letters 2020-08, Vol.45 (15), p.4156-4159
Main Authors: Wang, Senyu, Ma, Yiwei, Geng, Tao, Sun, Cuiting, Zhu, Hongjia, Li, Xiaoyang, Yi, Yang, Zhang, Shuo, Sun, Weimin, Yuan, Libo
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide lasers
Dynamic range
Gratings (spectra)
Inclined planes
Refractivity
Sensitivity enhancement
Strain measurement
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Summary: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 CO2 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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.391593