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

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Abstract

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.

Original languageEnglish
Article number108197
Number of pages13
JournalMeasurement: Journal of the International Measurement Confederation
Volume166
DOIs
Publication statusPublished - 2020

Keywords

  • Delaunay triangulation
  • Demodulation
  • FBG
  • Refractive index
  • Refractometer
  • Tilted fiber Bragg grating

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