Feasibility study of employing mechanically induced long-period fibre grating as optical-based sensors
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Publication Details
Author list: Chinggungval T., Khun-in R., Jiraraksopakun Y., Bhatranand A.
Publisher: Taylor and Francis Group
Publication year: 2021
Journal acronym: J. Mod. Opt.
Volume number: 68
Issue number: 21
Start page: 1173
End page: 1180
Number of pages: 8
ISSN: 0950-0340
eISSN: 1362-3044
Languages: English-Great Britain (EN-GB)
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Abstract
The investigation of long-period fibre gratings formed by a 3D printer with several grating periods is presented here. The proposed grating device was pressed on to an optical fibre to observe the resonant wavelengths as a function of different groove periods. Results showed that devices with 700 and 800 nm grating period introduced resonant wavelengths of 1,487 and 1,570 nm with refractive index changes of 2.121 × 10−3 and 1.963 × 10−3, respectively. Once resonant wavelengths were known, an optical time domain reflectometer (OTDR) was employed to determine light behaviour, event positions, and losses. The OTDR trace revealed that the non-reflective event occurred at the grating perturbation position. Consequently, the wavelength-dependent-resonance was caused by the non-contra-directional coupling of light from the fibre core to fibre cladding and its attenuation was a cubic function of an applied force. The proposed approach, therefore, shows a great potential to be used for the sensing applications in the vulnerable environments. © 2021 King Mongkut's University of Technology Thonburi. Published by Informa UK Limited, trading as Taylor & Francis Group.
Keywords
Mechanically induced long-period fibre grating, optical sensors
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