Demodulation of a tilted fibre Bragg grating transmission signal using α-shape modified Delaunay triangulation

被引：15
作者：
Fazzi, Luigi [1 ]
Groves, Roger M. [1 ]
机构：
[1] Delft Univ Technol, Fac Aerosp Engn, Struct Integr & Composites Grp, NL-2629 HS Delft, Netherlands
来源：
MEASUREMENT | 2020年 / 166卷
关键词：
Delaunay triangulation; Tilted fiber Bragg grating; FBG; Demodulation; Refractometer; Refractive index; CLADDING MODES; TEMPERATURE; SENSOR; STRAIN; SENSITIVITY;
D O I：
10.1016/j.measurement.2020.108197
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：13
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