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Optical Engineering

Temperature-compensated fiber-Bragg-grating-based magnetostrictive sensor for dc and ac currents
Author(s): Kin S. Chiang; Ramesh Kancheti; Vipul Rastogi
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Paper Abstract

A compact and inexpensive optical fiber sensor for the measurement of dc and ac currents is demonstrated. The sensor consists of a fiber Bragg grating bonded on two joined pieces of metal alloys, one being Terfenol-D and the other MONEL 400. Because Terfenol-D has much stronger magnetostriction, a magnetic field applied along the two alloy bars stretches the two portions of the grating in different proportions and, thus, results in a split in the reflection spectrum of the grating, which can be measured with a simple technique using a single photodetector. On the other hand, because Terfenol-D and MONEL 400 have almost identical thermal expansion coefficients, a change in temperature does not cause the reflected spectrum of the grating to split and, therefore, does not affect the magnetic field measurement.

Paper Details

Date Published: 1 July 2003
PDF: 4 pages
Opt. Eng. 42(7) doi: 10.1117/1.1576533
Published in: Optical Engineering Volume 42, Issue 7
Show Author Affiliations
Kin S. Chiang, City Univ. of Hong Kong (Hong Kong)
Ramesh Kancheti, City Univ. of Hong Kong (China)
Vipul Rastogi, City Univ. of Hong Kong (China)

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