| Téléchargement | - Voir la version finale : Accurate measurements of a wavelength drift in high-temperature silica-fiber Bragg gratings (PDF, 855 Kio)
|
|---|
| DOI | Trouver le DOI : https://doi.org/10.3390/metrology1010001 |
|---|
| Auteur | Rechercher : Dedyulin, Sergey1Identifiant ORCID : https://orcid.org/0000-0003-3525-2980; Rechercher : Timakova, Elena1; Rechercher : Grobnic, Dan2; Rechercher : Hnatovsky, Cyril2; Rechercher : Todd, Andrew D. W.1; Rechercher : Mihailov, Stephen J.2Identifiant ORCID : https://orcid.org/0000-0002-6144-0937 |
|---|
| Affiliation | - Conseil national de recherches Canada. Centre de recherche en métrologie
- Conseil national de recherches Canada. Technologies de sécurité et de rupture
|
|---|
| Format | Texte, Article |
|---|
| Sujet | fiber Bragg grating; wavelength drift; pressure-controlled heat pipe |
|---|
| Résumé | Fiber Bragg gratings (FBG) are extensively used to perform high-temperature measurements in harsh environments, however the drift of the characteristic Bragg wavelength affects their long-term stability resulting in an erroneous temperature measurement. Herein we report the most precise and accurate measurements of wavelength drifts available up to date on high-temperature FBGs. The measurements were performed with a set of packaged π-phase-shifted FBGs for high wavelength resolution, in caesium and sodium pressure-controlled heat pipes for stable temperature environment and with a tunable laser for stable wavelength measurements with a 0.1 pm resolution. Using this dataset we outline the experimental caveats that can lead to inconsistent results and confusion in measuring wavelength drifts, namely: influence of packaging; interchangeability of FBGs produced under identical conditions; birefringence of π-phase-shifted FBGs; initial transient behaviour of FBGs at constant temperature and dependence on the previous thermal history of FBGs. In addition, we observe that the wavelength stability of π-phase-shifted gratings at lower temperature is significantly improved upon by annealing at higher temperature. The lowest value of the wavelength drift we obtain is +0.014 pm·h⁻¹ at 600 °C (corresponding to +0.001 °C·h⁻¹) after annealing for 400 h at 1000 °C, the longest annealing time we have tried. The annealing time required to achieve the small drift rate is FBG-specific. |
|---|
| Date de publication | 2021-04-14 |
|---|
| Maison d’édition | MDPI |
|---|
| Licence | |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 5818ae3c-7d6e-4276-b142-0eee282e1881 |
|---|
| Enregistrement créé | 2021-04-26 |
|---|
| Enregistrement modifié | 2021-04-26 |
|---|
