Minimization of temperature cross-sensitivity of EFPI pressure sensor for oil and gas exploration and production applications in well bores

Han-Sun Choi; Andy Cantrelle; Clark Bergeron; Paul Tubel

doi:10.1117/12.580027

14 December 2004 Minimization of temperature cross-sensitivity of EFPI pressure sensor for oil and gas exploration and production applications in well bores

Han-Sun Choi, Andy Cantrelle, Clark Bergeron, Paul Tubel

Author Affiliations +

Proceedings Volume 5589, Fiber Optic Sensor Technology and Applications III; (2004) https://doi.org/10.1117/12.580027
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

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.

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Han-Sun Choi, Andy Cantrelle, Clark Bergeron, and Paul Tubel "Minimization of temperature cross-sensitivity of EFPI pressure sensor for oil and gas exploration and production applications in well bores", Proc. SPIE 5589, Fiber Optic Sensor Technology and Applications III, (14 December 2004); https://doi.org/10.1117/12.580027

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