20 December 2013 A hybrid demodulation method of fiber-optic Fabry-Perot pressure sensor
Author Affiliations +
Proceedings Volume 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 90441A (2013) https://doi.org/10.1117/12.2037668
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China
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.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Le Yu, Jianjun Lang, Yong Pan, Di Wu, Min Zhang, "A hybrid demodulation method of fiber-optic Fabry-Perot pressure sensor", Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 90441A (20 December 2013); doi: 10.1117/12.2037668; https://doi.org/10.1117/12.2037668
PROCEEDINGS
7 PAGES


SHARE
Back to Top