Quasi-Distributed Temperature Sensing Using Type-II Fiber Bragg Gratings in Sapphire Optical Fiber to Temperatures up to 1300°C

Brandon A. Wilson; Thomas E. Blue

doi:10.1109/JSEN.2018.2865910

Quasi-Distributed Temperature Sensing Using Type-II Fiber Bragg Gratings in Sapphire Optical Fiber to Temperatures up to 1300°C

Brandon A. Wilson, Thomas E. Blue

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

26 Scopus citations

Abstract

A sapphire optical fiber, with an internal cladding and an array of type-II Bragg gratings inscribed into it, was tested to temperatures up to 1300°C. The sapphire fiber was interrogated with an optical frequency domain reflectometer, using the Bragg gratings in the fiber as simply 'enhanced Rayleigh scatter.' The sapphire fiber was able to produce consistent temperature measurements up to 1300°C. Above 1000°C, small oscillations appeared in the measured temperature, which we believe were a consequence of vibrational strains on the fiber that were due to air currents within the furnace. A calibration was added to the optical frequency domain reflectometer that assumed a linear relationship between the fiber temperature and fiber length. We used this calibration to correlate phase shifts that were measured using the optical frequency domain reflectometer to temperatures that were measured using a B-type thermocouple. This calibration could be improved to increase the accuracy of the temperature measurements.

Original language	English
Article number	8438888
Pages (from-to)	8345-8351
Number of pages	7
Journal	IEEE Sensors Journal
Volume	18
Issue number	20
DOIs	https://doi.org/10.1109/JSEN.2018.2865910
State	Published - Oct 15 2018
Externally published	Yes

Funding

Manuscript received July 13, 2018; accepted August 6, 2018. Date of publication August 17, 2018; date of current version September 25, 2018. This work was supported by the Department of Energy Office of Nuclear Energy’s Nuclear Energy University Program under Grant NEUP 12-3456. The associate editor coordinating the review of this paper and approving it for publication was Prof. Agostino Iadicicco. (Corresponding author: Brandon A. Wilson.) The authors are with the Mechanical and Aerospace Engineering Department, Ohio State University, Columbus, OH 43210 USA (e-mail: [email protected]; [email protected]). Digital Object Identifier 10.1109/JSEN.2018.2865910

Funders	Funder number
Office of Nuclear Energy	NEUP 12-3456

Keywords

Sapphire optical fiber
fiber Bragg gratings
high temperature
optical frequency domain reflectometry

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10.1109/JSEN.2018.2865910

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title = "Quasi-Distributed Temperature Sensing Using Type-II Fiber Bragg Gratings in Sapphire Optical Fiber to Temperatures up to 1300°C",

abstract = "A sapphire optical fiber, with an internal cladding and an array of type-II Bragg gratings inscribed into it, was tested to temperatures up to 1300°C. The sapphire fiber was interrogated with an optical frequency domain reflectometer, using the Bragg gratings in the fiber as simply 'enhanced Rayleigh scatter.' The sapphire fiber was able to produce consistent temperature measurements up to 1300°C. Above 1000°C, small oscillations appeared in the measured temperature, which we believe were a consequence of vibrational strains on the fiber that were due to air currents within the furnace. A calibration was added to the optical frequency domain reflectometer that assumed a linear relationship between the fiber temperature and fiber length. We used this calibration to correlate phase shifts that were measured using the optical frequency domain reflectometer to temperatures that were measured using a B-type thermocouple. This calibration could be improved to increase the accuracy of the temperature measurements.",

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AB - A sapphire optical fiber, with an internal cladding and an array of type-II Bragg gratings inscribed into it, was tested to temperatures up to 1300°C. The sapphire fiber was interrogated with an optical frequency domain reflectometer, using the Bragg gratings in the fiber as simply 'enhanced Rayleigh scatter.' The sapphire fiber was able to produce consistent temperature measurements up to 1300°C. Above 1000°C, small oscillations appeared in the measured temperature, which we believe were a consequence of vibrational strains on the fiber that were due to air currents within the furnace. A calibration was added to the optical frequency domain reflectometer that assumed a linear relationship between the fiber temperature and fiber length. We used this calibration to correlate phase shifts that were measured using the optical frequency domain reflectometer to temperatures that were measured using a B-type thermocouple. This calibration could be improved to increase the accuracy of the temperature measurements.

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Quasi-Distributed Temperature Sensing Using Type-II Fiber Bragg Gratings in Sapphire Optical Fiber to Temperatures up to 1300°C

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