Rare-earth iron-compound (Terfenol)-based optical phase modulator/magnetometer for use in fiber optic smart-structure sensors

Venkatapura S. Sudarshanam; K. D. Kamdar; Richard O. Claus

doi:10.1117/12.147993

12 July 1993 Rare-earth iron-compound (Terfenol)-based optical phase modulator/magnetometer for use in fiber optic smart-structure sensors

Venkatapura S. Sudarshanam, K. D. Kamdar, Richard O. Claus

Author Affiliations +

Proceedings Volume 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation; (1993) https://doi.org/10.1117/12.147993
Event: 1993 North American Conference on Smart Structures and Materials, 1993, Albuquerque, NM, United States

Abstract

A new fiber optic magnetostrictive phase modulator/magnetometer utilizing the highly magnetostrictive rare-earth iron compound Tb_xDy_1-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/Hz^1/2 per meter of fiber interaction length. The projected minimum detectable magnetic field for 30 meters is thus seen to be 3 pT/Hz^1/2.

Citation Download Citation

Venkatapura S. Sudarshanam, K. D. Kamdar, and Richard O. Claus "Rare-earth iron-compound (Terfenol)-based optical phase modulator/magnetometer for use in fiber optic smart-structure sensors", Proc. SPIE 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation, (12 July 1993); https://doi.org/10.1117/12.147993

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