期刊
MEASUREMENT
卷 166, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2020.108197
关键词
Delaunay triangulation; Tilted fiber Bragg grating; FBG; Demodulation; Refractometer; Refractive index
资金
- Operationeel Programma Zuid-Nederland (Op-Zuid) Project as part of the Dutch Composite Maintenance Centre (DCMC)
- Europees Fonds voor Regionale Ontwikkeling (EFRO)
Reflective Tilted Fiber Bragg Grating (TFBG) sensors have intriguing sensing capabilities due to the resonance-peaks present in their transmitted spectrum. Previous works measured the external refractive index (ERI) in which the TFBG sensor is placed, by considering the wavelengths or the envelope of the cladding-modes resonances. In this paper, primarily, we demonstrate the effectiveness of an alternative global technique, based on Delaunay triangulation, to analyze the TFBG spectrum for refractometer purposes. Hence, we performed the correlation between the area subtended by the upper and lower cladding-modes peaks and the ERI. An investigation on the goodness-of-fit correlation functions is also presented for TFBG sensors written in standard- and thin-optical fibres and considering different values of the fundamental triangulation parameter alpha. (C) 2020 The Authors. Published by Elsevier Ltd.
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