Probe temperature sensor using elliptical-core dual-mode fiber

George Z. Wang; Anbo Wang; Kent A. Murphy; Sridhar Gollapudi; Richard O. Claus

doi:10.1117/12.141252

5 March 1993 Probe temperature sensor using elliptical-core dual-mode fiber

George Z. Wang, Anbo Wang, Kent A. Murphy, Sridhar Gollapudi, Richard O. Claus

Proceedings Volume 1795, Fiber Optic and Laser Sensors X; (1993) https://doi.org/10.1117/12.141252
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

A probe temperature sensor is constructed by attaching a long single mode fiber to a short (a few millimeters) dual mode elliptical core (e-core) fiber with an offset at the interface. The other endface of the e-core fiber is carefully polished to increase the reflectivity. The LP₀₁ and LP₁₁^even modes are excited in the e-core fiber which establishes a spatial two-lobe intensity pattern within the fiber. A temperature variation on the e-core fiber oscillates these two-lobe intensity pattern which gives rise to an intensity variation of the reflected light in the single mode fiber. A resolution of 0.5 degree(s)C has been achieved over the range of 25 degree(s)C to 122 degree(s)C. By adjusting the length of the dual mode e-core fiber, the output of this sensor can be linearized.

Citation Download Citation

George Z. Wang, Anbo Wang, Kent A. Murphy, Sridhar Gollapudi, and Richard O. Claus "Probe temperature sensor using elliptical-core dual-mode fiber", Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); https://doi.org/10.1117/12.141252

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