FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment
FBG sensors are used in many scientific and industrial fields for assessing the structural integrity of mechanical components and in very high (above 600 °C) or very low (cryogenic) temperature applications. The main concerns with the use of such sensors in applications involving extreme temperature...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/19/7255 |
| _version_ | 1797476949518450688 |
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| author | Carla Lupi Cristian Vendittozzi Erwin Ciro Ferdinando Felli |
| author_facet | Carla Lupi Cristian Vendittozzi Erwin Ciro Ferdinando Felli |
| author_sort | Carla Lupi |
| collection | DOAJ |
| description | FBG sensors are used in many scientific and industrial fields for assessing the structural integrity of mechanical components and in very high (above 600 °C) or very low (cryogenic) temperature applications. The main concerns with the use of such sensors in applications involving extreme temperatures are related partly to the instability of the reflected spectrum, which tends to dissolve into the noise floor, and partly to the degradation of the mechanical properties of the optical fiber, which tends to worsen the inherent brittleness. All of this raises the need for a robust nickel protective coating to ensure the grating’s integrity in high-temperature environments. In addition, the inherent brittleness of fiber-optic gratings leaves one to wonder whether it is possible to recover a broken, seemingly unusable sensor. In this way, a single-peak commercial FBG was intentionally broken in the middle of the grating length and re-spliced, inducing a strongly asymmetric chirped-like spectrum; then, a nickel coating was electrodeposited on its surface. The most important outcome achieved by this work is the regeneration of a highly distorted reflected spectrum through three thermal cycles performed from room temperature up to 500, 750, and 800 °C, respectively. After reaching a temperature of at least 700 °C, the spectrum, which has been drastically altered by splicing, becomes stable and restores its single peak shape. A further stabilization cycle carried out at 800 °C for 80 min led to an estimation of the stabilizing time of the new single-peak reflected spectrum. |
| first_indexed | 2024-03-09T21:11:02Z |
| format | Article |
| id | doaj.art-553ff6eb62e94e9fa0707ea7dcb7454b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T21:11:02Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-553ff6eb62e94e9fa0707ea7dcb7454b2023-11-23T21:46:05ZengMDPI AGSensors1424-82202022-09-012219725510.3390/s22197255FBG Spectrum Regeneration by Ni-Coating and High-Temperature TreatmentCarla Lupi0Cristian Vendittozzi1Erwin Ciro2Ferdinando Felli3Dipartimento Ingegneria Chimica Materiali Ambiente, Sapienza Rome University, Via Eudossiana 18, 00184 Roma, ItalyCampus FGA-UnB, Universidade de Brasília, Brasília 72444-240, DF, BrazilDipartimento Ingegneria Chimica Materiali Ambiente, Sapienza Rome University, Via Eudossiana 18, 00184 Roma, ItalyDipartimento Ingegneria Chimica Materiali Ambiente, Sapienza Rome University, Via Eudossiana 18, 00184 Roma, ItalyFBG sensors are used in many scientific and industrial fields for assessing the structural integrity of mechanical components and in very high (above 600 °C) or very low (cryogenic) temperature applications. The main concerns with the use of such sensors in applications involving extreme temperatures are related partly to the instability of the reflected spectrum, which tends to dissolve into the noise floor, and partly to the degradation of the mechanical properties of the optical fiber, which tends to worsen the inherent brittleness. All of this raises the need for a robust nickel protective coating to ensure the grating’s integrity in high-temperature environments. In addition, the inherent brittleness of fiber-optic gratings leaves one to wonder whether it is possible to recover a broken, seemingly unusable sensor. In this way, a single-peak commercial FBG was intentionally broken in the middle of the grating length and re-spliced, inducing a strongly asymmetric chirped-like spectrum; then, a nickel coating was electrodeposited on its surface. The most important outcome achieved by this work is the regeneration of a highly distorted reflected spectrum through three thermal cycles performed from room temperature up to 500, 750, and 800 °C, respectively. After reaching a temperature of at least 700 °C, the spectrum, which has been drastically altered by splicing, becomes stable and restores its single peak shape. A further stabilization cycle carried out at 800 °C for 80 min led to an estimation of the stabilizing time of the new single-peak reflected spectrum.https://www.mdpi.com/1424-8220/22/19/7255Fiber Bragg Gratingnickel coatingelectrodepositionhigh-temperature applicationschirped gratingspectrum regeneration |
| spellingShingle | Carla Lupi Cristian Vendittozzi Erwin Ciro Ferdinando Felli FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment Sensors Fiber Bragg Grating nickel coating electrodeposition high-temperature applications chirped grating spectrum regeneration |
| title | FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment |
| title_full | FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment |
| title_fullStr | FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment |
| title_full_unstemmed | FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment |
| title_short | FBG Spectrum Regeneration by Ni-Coating and High-Temperature Treatment |
| title_sort | fbg spectrum regeneration by ni coating and high temperature treatment |
| topic | Fiber Bragg Grating nickel coating electrodeposition high-temperature applications chirped grating spectrum regeneration |
| url | https://www.mdpi.com/1424-8220/22/19/7255 |
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