Commercial boiler test for distributed temperature sensor based on wavelength-multiplexed sapphire fiber bragg gratings

Shuo Yang; Daniel Homa; Hanna Heyl; Logan Theis; John Beach; Billy Dudding; Glen Acord; Dwyn Taylor; Gary Pickrell; Anbo Wang

doi:10.1117/12.2518315

14 May 2019 Commercial boiler test for distributed temperature sensor based on wavelength-multiplexed sapphire fiber bragg gratings

Shuo Yang, Daniel Homa, Hanna Heyl, Logan Theis, John Beach, Billy Dudding, Glen Acord, Dwyn Taylor, Gary Pickrell, Anbo Wang

Author Affiliations +

Proceedings Volume 11000, Fiber Optic Sensors and Applications XVI; 1100002 (2019) https://doi.org/10.1117/12.2518315
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

A distributed sensor based on wavelength-multiplexed sapphire fiber Bragg gratings (FBGs) was designed and fabricated for temperature measurements in commercial boilers under field conditions. Three cascaded FBGs with Bragg wavelengths ranging from 1540 nm to 1570 nm were inscribed in a commercial air-clad single-crystal sapphire fiber, which were packaged inside high purity alumina sheath tubes. The packaged sensor was deployed in a commercial boiler through an existing view port during operation. The tests were performed in a coal-fired boiler, whose temperature varied based on power demands in the local area. The reflected signal from the sensor was simultaneously recorded by an onsite optical interrogation system and converted into temperature information, which was monitored remotely in real time through the Virginia Tech network. The performance of the sensor was consistent during the entire test duration of 42 days, over the course of which it measured temperatures up to 700°C, showing the survivability of the sensing system in a field environment. The system has a demonstrated temperature measurement range from 25°C to 1200°C.

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Shuo Yang, Daniel Homa, Hanna Heyl, Logan Theis, John Beach, Billy Dudding, Glen Acord, Dwyn Taylor, Gary Pickrell, and Anbo Wang "Commercial boiler test for distributed temperature sensor based on wavelength-multiplexed sapphire fiber bragg gratings", Proc. SPIE 11000, Fiber Optic Sensors and Applications XVI, 1100002 (14 May 2019); https://doi.org/10.1117/12.2518315

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