Comparison of local mode shift and cut-off wavelength shift for demodulation of tilted fibre bragg grating sensors
Artykuł w czasopiśmie
MNiSW
100
Lista 2024
| Status: | |
| Autorzy: | Cięszczyk Sławomir, Skorupski Krzysztof, Panas Patryk, Wawrzyk Martyna |
| Dyscypliny: | |
| Aby zobaczyć szczegóły należy się zalogować. | |
| Rok wydania: | 2025 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 3 |
| Wolumen/Tom: | 32 |
| Strony: | 1 - 14 |
| Impact Factor: | 1,1 |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | TAK |
| Licencja: | |
| Sposób udostępnienia: | Witryna wydawcy |
| Wersja tekstu: | Ostateczna wersja opublikowana |
| Czas opublikowania: | W momencie opublikowania |
| Data opublikowania w OA: | 28 listopada 2025 |
| Abstrakty: | angielski |
| Tilted fibre Bragg gratings (TFBGs) have a characteristic transmission spectrum in the form of a fine comb of cladding mode resonances. This spectrum changes significantly when the sensor is immersed in a substance with a specific refractive index (RI) value. Surrounding RI (SRI) values can be derived from the global shape of the entire cladding mode spectrum or the local shape of a single mode. In this article, we present comparisons of two types of TFBG spectra demodulation methods for SRI determination. The first approach to determining the SRI is based on the local wavelength shift of a single mode and a group of cladding modes. As a modification, a differential method of analysis of two modes and two groups of modes (spectral bands) was proposed. As a result, differential methods with better resolution and linearity were obtained compared to single-mode analysis. To determine the local shift, the centroid, fast phase correlation and cross-correlation methods were used. The global spectrum analysis method with cut-off wavelength determination was used as the other type of demodulation method. The cut-off wavelength shift was determined using the maximum derivative method of the smoothed absolute value of the derivative of the optical spectrum. The best resolution for SRI determination with the local method was 2.4 · 10−5 RIU, while for the global method it was 1.75 · 10−5 RIU for the SRI measurement range of 1.333 to 1.361 RIU. |
