Highly Sensitive Temperature Sensor Based on a UV Glue-Filled Fabry–Perot Interferometer Utilizing the Vernier Effect

Chengwen Qiang; Chu Chu; Yuhan Wang; Xinghua Yang; Xinyu Yang; Yuting Hou; Xingyue Wen; Pingping Teng; Bo Zhang; Sivagunalan Sivanathan; Adam Jones; Kang Li

doi:10.3390/photonics12030256

Highly Sensitive Temperature Sensor Based on a UV Glue-Filled Fabry–Perot Interferometer Utilizing the Vernier Effect

Chengwen Qiang, Chu Chu, Yuhan Wang, Xinghua Yang^*, Xinyu Yang, Yuting Hou, Xingyue Wen, Pingping Teng^*, Bo Zhang, Sivagunalan Sivanathan, Adam Jones, Kang Li

^*Corresponding author for this work

Faculty of Computing, Engineering and Science

Research output: Contribution to journal › Article › peer-review

Abstract

A parallel Fabry–Perot interferometer (FPI) optical fiber sensor, enhanced with UV glue, was proposed for environmental temperature detection. The UV glue is applied to the fiber’s sensing region using a coating method, forming an FP cavity through misalignment welding, allowing the FP to function as a temperature sensor. In parallel, a reference FPI with a similar free spectral range (FSR) is connected, generating a Vernier effect that amplifies small changes in the refractive index (RI) of the sensing region. The study demonstrates that UV glue enhances the temperature-sensing capabilities of the FP, and when combined with the Vernier effect, it significantly improves the sensitivity of a single interferometric sensor. The temperature sensitivity of the parallel-connected FPI is −2.80219 nm/°C, which is 7.768 times greater than that of a single FPI (−0.36075 nm/°C). The sensor shows high sensitivity, stability, and reversibility, making it promising for temperature-monitoring applications in various fields, including everyday use, industrial production, and the advancement of optical fiber temperature-sensing technologies.

Original language	English
Article number	256
Number of pages	14
Journal	Photonics
Volume	12
Issue number	3
DOIs	https://doi.org/10.3390/photonics12030256
Publication status	Published - 13 Mar 2025

Keywords

Fabry–Perot interferometer
optical fiber sensor
temperature sensor
UV glue
Vernier effect

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10.3390/photonics12030256Licence: CC BY

Version of Record with a CC BY LicenceFinal published version, 5.87 MBLicence: CC BY

Cite this

@article{fd69f7fac4f749da844058349c962834,

title = "Highly Sensitive Temperature Sensor Based on a UV Glue-Filled Fabry–Perot Interferometer Utilizing the Vernier Effect",

abstract = "A parallel Fabry–Perot interferometer (FPI) optical fiber sensor, enhanced with UV glue, was proposed for environmental temperature detection. The UV glue is applied to the fiber{\textquoteright}s sensing region using a coating method, forming an FP cavity through misalignment welding, allowing the FP to function as a temperature sensor. In parallel, a reference FPI with a similar free spectral range (FSR) is connected, generating a Vernier effect that amplifies small changes in the refractive index (RI) of the sensing region. The study demonstrates that UV glue enhances the temperature-sensing capabilities of the FP, and when combined with the Vernier effect, it significantly improves the sensitivity of a single interferometric sensor. The temperature sensitivity of the parallel-connected FPI is −2.80219 nm/°C, which is 7.768 times greater than that of a single FPI (−0.36075 nm/°C). The sensor shows high sensitivity, stability, and reversibility, making it promising for temperature-monitoring applications in various fields, including everyday use, industrial production, and the advancement of optical fiber temperature-sensing technologies.",

keywords = "Fabry–Perot interferometer, optical fiber sensor, temperature sensor, UV glue, Vernier effect",

author = "Chengwen Qiang and Chu Chu and Yuhan Wang and Xinghua Yang and Xinyu Yang and Yuting Hou and Xingyue Wen and Pingping Teng and Bo Zhang and Sivagunalan Sivanathan and Adam Jones and Kang Li",

note = "Publisher Copyright: {\textcopyright} 2025 by the authors.",

year = "2025",

month = mar,

day = "13",

doi = "10.3390/photonics12030256",

language = "English",

volume = "12",

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T1 - Highly Sensitive Temperature Sensor Based on a UV Glue-Filled Fabry–Perot Interferometer Utilizing the Vernier Effect

AU - Qiang, Chengwen

AU - Chu, Chu

AU - Wang, Yuhan

AU - Yang, Xinghua

AU - Yang, Xinyu

AU - Hou, Yuting

AU - Wen, Xingyue

AU - Teng, Pingping

AU - Zhang, Bo

AU - Sivanathan, Sivagunalan

AU - Jones, Adam

AU - Li, Kang

PY - 2025/3/13

Y1 - 2025/3/13

N2 - A parallel Fabry–Perot interferometer (FPI) optical fiber sensor, enhanced with UV glue, was proposed for environmental temperature detection. The UV glue is applied to the fiber’s sensing region using a coating method, forming an FP cavity through misalignment welding, allowing the FP to function as a temperature sensor. In parallel, a reference FPI with a similar free spectral range (FSR) is connected, generating a Vernier effect that amplifies small changes in the refractive index (RI) of the sensing region. The study demonstrates that UV glue enhances the temperature-sensing capabilities of the FP, and when combined with the Vernier effect, it significantly improves the sensitivity of a single interferometric sensor. The temperature sensitivity of the parallel-connected FPI is −2.80219 nm/°C, which is 7.768 times greater than that of a single FPI (−0.36075 nm/°C). The sensor shows high sensitivity, stability, and reversibility, making it promising for temperature-monitoring applications in various fields, including everyday use, industrial production, and the advancement of optical fiber temperature-sensing technologies.

AB - A parallel Fabry–Perot interferometer (FPI) optical fiber sensor, enhanced with UV glue, was proposed for environmental temperature detection. The UV glue is applied to the fiber’s sensing region using a coating method, forming an FP cavity through misalignment welding, allowing the FP to function as a temperature sensor. In parallel, a reference FPI with a similar free spectral range (FSR) is connected, generating a Vernier effect that amplifies small changes in the refractive index (RI) of the sensing region. The study demonstrates that UV glue enhances the temperature-sensing capabilities of the FP, and when combined with the Vernier effect, it significantly improves the sensitivity of a single interferometric sensor. The temperature sensitivity of the parallel-connected FPI is −2.80219 nm/°C, which is 7.768 times greater than that of a single FPI (−0.36075 nm/°C). The sensor shows high sensitivity, stability, and reversibility, making it promising for temperature-monitoring applications in various fields, including everyday use, industrial production, and the advancement of optical fiber temperature-sensing technologies.

KW - Fabry–Perot interferometer

KW - optical fiber sensor

KW - temperature sensor

KW - UV glue

KW - Vernier effect

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