1 July 2003 Temperature-compensated fiber-Bragg-grating-based magnetostrictive sensor for dc and ac currents
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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.
Kin S. Chiang, Ramesh Kancheti, Vipul Rastogi, "Temperature-compensated fiber-Bragg-grating-based magnetostrictive sensor for dc and ac currents," Optical Engineering 42(7), (1 July 2003). https://doi.org/10.1117/1.1576533

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