Fiber-optic dual-technique sensor for simultaneous measurement of strain and temperature

Author

Vengsarkar, Ashish M. ; Michie, W. Craig ; Jankovic, Ljilja ; Culshaw, Brian ; Claus, Richard O.

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

12

Issue

1

fYear

1994

fDate

1/1/1994 12:00:00 AM

Firstpage

170

Lastpage

177

Abstract

Polarimetric and two-mode differential interferometric schemes incorporated in an elliptical-core fiber are able to resolve strain and temperature simultaneously with resolutions of 10 μm/m and 5°C, respectively. A technique, based on the evaluation of the condition number of a matrix, is shown to be useful in evaluating comparative merits of multiparameter sensing schemes. The determinant of the beat length matrix is expressed in terms of mode propagation constants, and a method for designing specialized fibers suitable for simultaneous measurement of strain and temperature is proposed. Experimental results for four fibers are presented and cross-sensitivity issues are discussed

Keywords

fibre optic sensors; light interferometers; light interferometry; polarimeters; polarimetry; strain measurement; temperature measurement; beat length matrix; condition number; cross-sensitivity; elliptical-core fiber; fiber-optic dual-technique sensor; matrix; mode propagation constants; multiparameter sensing; polarimetric scheme; simultaneous measurement; strain measurement; temperature measurement; two-mode differential interferometric scheme; Capacitive sensors; Magnetic field induced strain; Magnetic sensors; Optical fiber polarization; Optical fiber sensors; Optical fiber theory; Sensor phenomena and characterization; Strain measurement; Temperature measurement; Temperature sensors;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.265750

Filename

265750