Examinando por Autor "Ferreira, L. A."
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Ítem Restringido Micromachined low-finesse Fabry-Perot interferometer for the measurement of low DC electrical currents(Institute of Electrical and Electronics Engineers, 2002-05-10) López Heredero, R.; Santos, J. L.; Fernández de Caleya, R. F.; Araújo, F. M.; Ferreira, L. A.; Guerrero, H.; Guerrero, H. [0000-0003-2922-3489]; López Heredero, R. [0000-0002-2197-8388]An optical fiber current sensor based on a permanent magnet fixed on the center of a micromachined Si membrane has been presented. The transducing operation principle is magneto-mechanical and has a linear response. A great improvement of the sensitivity of the microcavities was achieved by the use of a planar coil. Interrogation of the transducer has been carried out using a Fabry-Perot interferometer with an all-fiber detection system to avoid the influence of electromagnetic noise. The effectiveness of a fiber scheme based on the utilization of two fibre Bragg gratings to generate two quadrature phase-shifted interferometric signals has also been reported.
