Abstract
In this paper, we present a simple fiber optic sensor for magnetic-field/electric current measurement based on broadband fluorescence in a Bi12SiO20 crystal. A simple polarimetric scheme in combination with a standard 105/125 μm multimode fiber, a 405 nm laser diode and a spectrometer to analyze the spectrum is used. The magnetic field induces phase changes measured by the spectral shifts of the wavelength modulated response. The sensitivity is found to be wavelength dependent. It increases from 0.138 nm/A at 540 nm to 0.224 nm/A at 715 nm and is inversely proportional to the Verdet constant. A minimum current of 0.4A can be detected with a dynamic range of up to 32 dB. A detailed polarization analysis is presented.
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