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Proceedings Paper

Two-mode elliptical-core fiber sensors for measurement of strain and temperature
Author(s): Anbo Wang
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Paper Abstract

We propose two temperature-compensated strain sensing methods that combine the properties of a two-mode, elliptical-core (e-core) fiber sensor and (i) a bimetallic strip, or, (ii) refractive-index changes in a liquid-filled hollow-core fiber. The output from a conventional two-mode, e-core fiber sensor is (i) projected upon a multimode fiber attached to a bimetallic strip, or, (ii) projected from an angular endface on a multimode fiber. The multimode fiber acts as a spatial filter and picks up part of the two-lobe pattern incident upon its core. A measurement of the differential phase variation gives an indication of the strain. The modulation depth of the output signal is shown to be a faithful indication of the temperature in both cases. Strain sensitivities typical of two-mode fiber sensors (0.033°phase shift per tstrain-cm, minimum detectable strains of 0.17 μm/m for one meter sensing length) have been obtained with a temperature compensation accuracy of ±1°C over a 75°C range.

Paper Details

Date Published: 1 December 1991
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Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991); doi: 10.1117/12.2321928
Show Author Affiliations
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 1584:
Fiber Optic and Laser Sensors IX
Ramon P. DePaula; Eric Udd, Editor(s)

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