5 May 2015 Magnetic field measurement using a fiber laser sensor in ring arrangement
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Abstract
In this work an optical fiber laser with loop configuration was developed for magnetic field measurement. The transducer element is an FBG written in a HiBi fiber whose wavelength is modified using a magnetostrictive material that applies deformation in the presence of the magnetic field. The laser has a bandwidth of 450 MHz and operates in single polarization. A shift of 258.5 pm was observed in the laser operating wavelength for a magnetic field of 17.85 mT. Moreover, a maximum sensitivity of 14.72 pm/mT in the linear regime operation was achieved when increasing the magnetic field. The system provides a narrow emission line that is dependent on the magnetic field magnitude enabling high resolution interferometric measurement schemes. The laser response to AC magnetic fields was also characterized using a passive interferometer with higher sensitivity in the range of 8.32 to 17.93 mTRMS.
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I. M. Nascimento, I. M. Nascimento, J. M. Baptista, J. M. Baptista, P. A. S. Jorge, P. A. S. Jorge, J. L. Cruz , J. L. Cruz , M. V. Andrés, M. V. Andrés, } "Magnetic field measurement using a fiber laser sensor in ring arrangement", Proc. SPIE 9506, Optical Sensors 2015, 95061M (5 May 2015); doi: 10.1117/12.2182644; https://doi.org/10.1117/12.2182644
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