Magnetostrictive transducers for optical fiber magnetic field sensors

Kyung-Shik Lee; Yu Sheop Lee; Su Jeong Suh

doi:10.1117/12.191864

1 November 1994 Magnetostrictive transducers for optical fiber magnetic field sensors

Kyung-Shik Lee, Yu Sheop Lee, Su Jeong Suh

Proceedings Volume 2292, Fiber Optic and Laser Sensors XII; (1994) https://doi.org/10.1117/12.191864
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Various metallic glass ribbons made of Co₇₀Fe₁₀B₂₀, Co₇₆Fe₄B₂₀, Co₈₀B₂₀ and Ni are developed using the melt-spinning technique and their magnetic properties, affecting the performance of a typical interferometric optical fiber magnetic field sensor, are tested. By bonding the metallic ribbons to a single mode fiber arm, a typical interferometric fiber optic magnetic field sensing system is constructed. The ac magnetostrictive responses for the metallic glasses measured with the fiber optic sensing system show that the dc bias field for the maximum response with a Co₇₀Fe₁₀B₂₀ ribbon is approximately 0.97 Oe and that with a Ni ribbon is 23 Oe. The Co₇₀Fe₁₀B₂₀- and Ni-transducer exhibit maximum magnetostriction near 0.5 kHz while the Co₇₆Fe₄B₂₀ transducer demonstrates peak response at 0.9 kHz AND 12 kHz. The measured effective magnetostrictive parameters and saturation magnetostrictions are 2 X 10^-7/Oe² approximately 3 X 10^-7/Oe² and -4.6 X 10^-6 approximately 5.7 X 10^-6, respectively. Typical optical fiber sensors exhibit minimum detectable fields of the order of approximately 10^-5 Oe(rms)/(root)Hz.

Citation Download Citation

Kyung-Shik Lee, Yu Sheop Lee, and Su Jeong Suh "Magnetostrictive transducers for optical fiber magnetic field sensors", Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); https://doi.org/10.1117/12.191864

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