TY - JOUR
T1 - Demodulation of a tilted fibre Bragg grating transmission signal using α-shape modified Delaunay triangulation
AU - Fazzi, Luigi
AU - Groves, Roger M.
PY - 2020
Y1 - 2020
N2 - 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 α.
AB - 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 α.
KW - Delaunay triangulation
KW - Demodulation
KW - FBG
KW - Refractive index
KW - Refractometer
KW - Tilted fiber Bragg grating
UR - http://www.scopus.com/inward/record.url?scp=85088119605&partnerID=8YFLogxK
U2 - 10.1016/j.measurement.2020.108197
DO - 10.1016/j.measurement.2020.108197
M3 - Article
SN - 0263-2241
VL - 166
JO - Measurement: Journal of the International Measurement Confederation
JF - Measurement: Journal of the International Measurement Confederation
M1 - 108197
ER -