Title :
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
fDate :
1/1/1994 12:00:00 AM
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;
Journal_Title :
Lightwave Technology, Journal of
