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Proceedings Paper

A hybrid demodulation method of fiber-optic Fabry-Perot pressure sensor
Author(s): Le Yu; Jianjun Lang; Yong Pan; Di Wu; Min Zhang
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Paper Abstract

The fiber-optic Fabry-Perot pressure sensors have been widely applied to measure pressure in oilfield. For multi-well it will take a long time (dozens of seconds) to demodulate downhole pressure values of all wells by using only one demodulation system and it will cost a lot when every well is equipped with one system, which heavily limits the sensor applied in oilfield. In present paper, a new hybrid demodulation method, combining the windowed nonequispaced discrete Fourier Transform (nDFT) method with segment search minimum mean square error estimation (MMSE) method, was developed, by which the demodulation time can be reduced to 200ms, i.e., measuring 10 channels/wells was less than 2s. Besides, experimental results showed the demodulation cavity length of the fiber-optic Fabry-Perot sensor has a maximum error of 0.5 nm and consequently pressure measurement accuracy can reach 0.4% F.S.

Paper Details

Date Published: 20 December 2013
PDF: 7 pages
Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 90441A (20 December 2013); doi: 10.1117/12.2037668
Show Author Affiliations
Le Yu, Tsinghua Univ. (China)
Jianjun Lang, PetroChina Xinjiang Oilfield Co. (China)
Yong Pan, PetroChina Xinjiang Oilfield Co. (China)
Di Wu, Ningbo Nuoke Electronic Technology Development Co., Ltd. (China)
Min Zhang, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 9044:
2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Brian Culshaw; Xuping Zhang; Anbo Wang, Editor(s)

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