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Proceedings Paper

Rare-earth iron-compound (Terfenol)-based optical phase modulator/magnetometer for use in fiber optic smart-structure sensors
Author(s): Venkatapura S. Sudarshanam; K. D. Kamdar; Richard O. Claus
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Paper Abstract

A new fiber optic magnetostrictive phase modulator/magnetometer utilizing the highly magnetostrictive rare-earth iron compound TbxDy1-xFe2 is demonstrated to have a high sensitivity, dynamic range, minimum field detectability, and a better structural suitability than metallic glasses. The experimental linear phase shifting coefficient was 1.102 rad/Vp-m with the corresponding phase shift normalized to the magnetic field of 0.306 rad/G- m. A minimum detectable phase shift of better than 1 (mu) rad was obtained, which corresponds to 2 (mu) G/m for a 4 Hz bandwidth and 1 (mu) G/Hz1/2 per meter of fiber interaction length. The projected minimum detectable magnetic field for 30 meters is thus seen to be 3 pT/Hz1/2.

Paper Details

Date Published: 12 July 1993
PDF: 7 pages
Proc. SPIE 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation, (12 July 1993); doi: 10.1117/12.147993
Show Author Affiliations
Venkatapura S. Sudarshanam, Virginia Polytechnic Institute and State Univ. (United States)
K. D. Kamdar, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 1918:
Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation
Richard O. Claus, Editor(s)

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