A hybrid demodulation method of fiber-optic Fabry-Perot pressure sensor

Le Yu; Jianjun Lang; Yong Pan; Di Wu; Min Zhang

doi:10.1117/12.2037668

20 December 2013 A hybrid demodulation method of fiber-optic Fabry-Perot pressure sensor

Le Yu, Jianjun Lang, Yong Pan, Di Wu, Min Zhang

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.

Citation Download Citation

Le Yu, Jianjun Lang, Yong Pan, Di Wu, and 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); https://doi.org/10.1117/12.2037668

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available