NDLI: High resolution fiber laser sensor for hydrostatic pressure

Content Provider	IEEE Xplore Digital Library
Author	Frank, A. Haroud, K. Rochat, E. Bohnert, K. Brandle, H.
Copyright Year	2002
Description	Author affiliation: ABB Corporate Res., Baden-Dattwil, Switzerland (Frank, A.; Haroud, K.; Rochat, E.; Bohnert, K.; Brandle, H.)
Abstract	Polarimetric fiber laser sensors are attractive due to their frequency encoded output, which does not require any referencing, and their potential for high resolution. Both Fabry-Perot and distributed feedback fiber (DFB) laser sensors have been investigated for the measurement of strain, uniaxial pressure and magnetic fields (H.K. Kim et al, 1993; G.A. Ball et al, 1993; H.K. Kim et al, 1995; J.T. Kringlebton et al, 1996; S.-Y. Huang et al, 1990). In this paper, a Fabry-Perot type fiber laser sensor for fluid pressure is reported. The pressure acts directly on an elliptical core sensing fiber (S.-Y. Huang et al, 1990; W.J. Bock and W. Urbanczyk, 1996) doped with erbium. As a result, no mechanical transducer is required, which makes possible a sensor with very small diameter. Fiber Bragg gratings (FBG) are used as reflectors for the laser. Configurations with the gratings written into circular core fibers, as well as into the doped elliptical core fibers, are analyzed. It is shown that the dispersion of the highly birefringent gratings can be employed to significantly improve the sensor resolution into the range of a few 10/sup -6/ of the full scale signal. Possible applications of the sensor include pressure monitoring in oil wells and other hostile environments.
Starting Page	359
Ending Page	362
File Size	310466
Page Count	4
File Format	PDF
ISBN	0780372891
DOI	10.1109/OFS.2002.1000580
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber sensors Fiber lasers Erbium-doped fiber lasers Magnetic sensors Laser feedback Distributed feedback devices Fabry-Perot Magnetic field measurement Strain measurement Magnetic field induced strain
Content Type	Text
Resource Type	Article

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