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Optical Engineering

Fiber optic magnetostrictive transducers for magnetic field sensing
Author(s): Kyung-Shik Lee; Hyun Seo Kang; Moo Yuan Park
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Paper Abstract

A number of fiber optic magnetostrictive transducers were fabricated using various metallic glass ribbons made of Co70Fe10B20, Co76Fe4B20, Co80B20, Ni, Fe79B16Si5, and Fe40Ni38Mo4B18 and were characterized by a typical optical fiber Mach-Zehnder interferometer constructed by splicing the fiber transducers to the single-mode-fiber sensing arm. The ac magnetostrictive responses for the metallic glasses measured with the fiber optic sensing system show that the dc-bias field (Hp) for the maximum response with a Co70Fe10B20 ribbon is ~ 0.97 Oe, that with a Ni ribbon is 23 Oe, and with a Fe79B16Si5 ribbon is 5.7 Oe. A magnetostriction function describing the magnetostrictive response of the transducer was also empirically found. The measured effective magnetostrictive parameters and saturation magnetostrictions are 1.3 x 10-7/Oe2 to 7 x 10-7/Oe2 and -4.6 x 10-6 to 5.7 x 10-6, respectively. The optical fiber sensors exhibit minimum detectable fields Hmin of the order of between 10-5 Oe(rms)/√Hz and 10-7 Oe(rms)/√Hz above 1 kHz at their respective dc-bias fields Hp. The Hmin can be much further improved by reducing the level of noises that limit the phase resolution to ~ 10-4 rad/√Hz in the interferometer.

Paper Details

Date Published: 1 December 1995
PDF: 6 pages
Opt. Eng. 34(12) doi: 10.1117/12.215498
Published in: Optical Engineering Volume 34, Issue 12
Show Author Affiliations
Kyung-Shik Lee, Sung Kyun Kwan Univ. (South Korea)
Hyun Seo Kang, Sung Kyun Kwan Univ. (South Korea)
Moo Yuan Park, Sung Kyun Kwan Univ. (South Korea)

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