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Proceedings Paper

Fiber-optic high-temperature sensing system and its field application
Author(s): Yizheng Zhu; Fabin Shen; Zhengyu Huang; Kristie L. Cooper; Gary R. Pickrell; Anbo Wang; John McDaniel; Tim Pedro
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Paper Abstract

This paper presents the development of a sapphire-based fiber-optic sensing system for temperature monitoring in harsh environment, including sensor and system design, implementation, laboratory tests and field demonstration. The sensor is built with single-crystal sapphire fiber and sapphire wafer. As the sensing element, the wafer constitutes an extrinsic Fabry-Perot interferometer (EFPI) by its two surfaces. Its optical thickness has significant thermal dependence and provides temperature information through white light interferometry. The sensors were tested to 1600°C with 0.2% full scale accuracy and 0.5°C resolution. They were further demonstrated in industrial environment. A complete sensing system was developed around the sensor for temperature monitoring in a coal gasifier at the Tampa Electric Company's Polk Power Station. It consists of three major components: 1) Sensors and their packaging which were installed in the coal gasifier, 2) Optical interrogation unit for detection and transmission of sensor signal, and 3) Processing and control unit for signal demodulation. The system continuously operated and delivered temperature readings for seven months.

Paper Details

Date Published: 5 October 2007
PDF: 8 pages
Proc. SPIE 6757, Sensors for Harsh Environments III, 675704 (5 October 2007); doi: 10.1117/12.732906
Show Author Affiliations
Yizheng Zhu, Virginia Polytechnic Institute and State Univ. (United States)
Fabin Shen, Microsoft Corp. (United States)
Zhengyu Huang, Sabeus, Inc. (United States)
Kristie L. Cooper, Virginia Polytechnic Institute and State Univ. (United States)
Gary R. Pickrell, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)
John McDaniel, TECO Energy (United States)
Tim Pedro, TECO Energy (United States)

Published in SPIE Proceedings Vol. 6757:
Sensors for Harsh Environments III
Hai Xiao; Anbo Wang, Editor(s)

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