Optical fibers coated by magnetostrictive ceramic films were tested with a Mach-Zehnder interferometer in an open-loop mode. The sensors exhibited excellent linearity and good sensitivity. The response of ceramic-jacketed fibers was not affected by small de fluctuations that are due to the linear behavior of tested ceramic coatings in low magnetic fields. Tested ceramic materials included magnetite, gamma-Fe2O3, nickel ferrite, and cobalt-doped nickel ferrite (NCF2) jackets. The latter showed the best performance. A minimum detectable field of 3.2 x 10(-3) A/m for optical fiber jacketed with 2-mu m-thick and 1-m-long NCF2 material has been achieved. The capability of detecting magnetic fields as low as 2.6 x 10(-7) A/m with a 10-mu m-thick cobalt-doped nickel ferrite jacket is proposed. (C) 1996 Optical Society of America [References: 15]
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机译：用Mach-Zehnder干涉仪在开环模式下测试涂有磁致伸缩陶瓷膜的光纤。传感器具有出色的线性度和良好的灵敏度。夹套陶瓷纤维的响应不受小的起伏影响，起伏不大是由于在低磁场下测试的陶瓷涂层的线性行为引起的。经过测试的陶瓷材料包括磁铁矿，γ-Fe2O3，镍铁氧体和钴掺杂镍铁氧体（NCF2）护套。后者表现出最好的性能。对于2微米厚和1微米长的NCF2材料护套的光纤，其最小可检测场为3.2 x 10（-3）A / m。提出了使用10μm厚的钴掺杂镍铁氧体外套检测低至2.6 x 10（-7）A / m的磁场的能力。 （C）1996年美国眼镜学会[参考：15]
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