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Journal of Micro/Nanolithography, MEMS, and MOEMS • Open Access

Optical fiber strain sensor based on sandwiched long-period fiber gratings with a surface bonding layer
Author(s): Chia-Chin Chiang; Chien-Hsing Li

Paper Abstract

An optical fiber strain sensor based on sandwiched long-period fiber gratings (OFSS-SLPFG) with a surface bonding layer is proposed. The proposed OFSS-SLPFG is an etched optical fiber that is sandwiched between two thick photoresists with a periodic structure. To prevent the glue effect in the surface bonding process, where glue flows into the SLPFG structure, reducing the coupling strength, a surface bonding layer (thickness: 16  μm) is used as the base layer on the bottom of the OFSS-SLPFG. The OFSS-SLPFG is, therefore, more effective for use as a strain sensor. When external strain loading is applied, the resonant dip loss of the OFSS-SLPFG is reflected linearly. A bending strain calibration experiment is demonstrated by the four-point bending test. The results show an average linearity (R2) of 0.980, with a sensitivity of 0.00788  dB/με. This phenomenon suggests that the OFSS-SLPFG can be utilized as a sensitive strain transducer.

Paper Details

Date Published: 3 November 2014
PDF: 5 pages
J. Micro/Nanolith. 13(4) 043008 doi: 10.1117/1.JMM.13.4.043008
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 13, Issue 4
Show Author Affiliations
Chia-Chin Chiang, National Kaohsiung Univ. of Applied Sciences (Taiwan)
Chien-Hsing Li, National Kaohsiung Univ. of Applied Sciences (Taiwan)


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