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Proceedings Paper

Minimization of temperature cross-sensitivity of EFPI pressure sensor for oil and gas exploration and production applications in well bores
Author(s): Han-Sun Choi; Andy Cantrelle; Clark Bergeron; Paul Tubel
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Paper Abstract

Extrinsic Fabry-Perot Interferometer, EFPI, is a versatile device for many fiber optic sensing applications including one in harsh environments such as oil and gas wells. Due to its unique structure, the EFPI could be designed to have an extremely small temperature cross-sensitivity (TCS), by matching the coefficients of thermal expansion (CTE's) of the outer gage capillary tube and the inner fibers. Even though it is relatively easy to get a matching condition at the atmospheric pressure, it is not a good design because the CTE of the capillary tubing is expected to change under high pressure conditions. In this paper, the method and the experimental results for the study to minimize the temperature cross-sensitivity (TCS) of the EFPI pressure sensor are presented. Test results have confirmed that the CTE of the capillary tube slightly increases under high pressure, changing the original TCS at the atmospheric pressure. By manipulating the design of the sensor to have a higher negative slope of TCS for the air-gap (dG/dT) at the atmospheric pressure, the zero TCS point can be deliberately shifted to any point of interest within the pressure range.

Paper Details

Date Published: 14 December 2004
PDF: 8 pages
Proc. SPIE 5589, Fiber Optic Sensor Technology and Applications III, (14 December 2004); doi: 10.1117/12.580027
Show Author Affiliations
Han-Sun Choi, Tubel Technologies, Inc. (United States)
Andy Cantrelle, Tubel Technologies, Inc. (United States)
Clark Bergeron, Tubel Technologies, Inc. (United States)
Paul Tubel, Tubel Technologies, Inc. (United States)

Published in SPIE Proceedings Vol. 5589:
Fiber Optic Sensor Technology and Applications III
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

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