Magnetic field measurement using a fiber laser sensor in ring arrangement

I. M. Nascimento; J. M. Baptista; P. A. S. Jorge; J. L. Cruz; M. V. Andrés

doi:10.1117/12.2182644

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5 May 2015 Magnetic field measurement using a fiber laser sensor in ring arrangement

I. M. Nascimento, J. M. Baptista, P. A. S. Jorge, J. L. Cruz , M. V. Andrés

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Proceedings Volume 9506, Optical Sensors 2015; 95061M (2015) https://doi.org/10.1117/12.2182644
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

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 mT_RMS.

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I. M. Nascimento, J. M. Baptista, P. A. S. Jorge, J. L. Cruz , and M. V. Andrés "Magnetic field measurement using a fiber laser sensor in ring arrangement", Proc. SPIE 9506, Optical Sensors 2015, 95061M (5 May 2015); https://doi.org/10.1117/12.2182644

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