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A fiber-optic magnetic sensor whose design is based on the Lorentzian force is presented. Optical phase sensitivities of 0.67 and 0.11 rad/(A/m) for AC and DC magnetic fields are obtained with a linearity of three decades using 100 mm of Al-coated sensor fiber. A configuration for multipoint AC field measurement with frequency-independent sensitivity is proposed. Electric current is measurable with a 2.6-rad/ mu A sensitivity.>
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H. Okamura (1990) studied this question.
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