Magnetic Sensor
Mostrando 25-36 de 50 artigos, teses e dissertações.
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25. Optimization of the magnetic properties of materials for fluxgate sensors
A study was made of the variation of the magnetic properties of cobalt-based alloys using different compositions of CoFeSiB and CoFeSiBCr systems, which were produced by the melt-spinning technique and some of them subjected to a stress annealing treatment. A comparative study of core geometry and supporting material was also performed in order to obtain low
Materials Research. Publicado em: 2008-06
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26. Nonlinear H-infinity controller applied on electromagnetic suspension system: project and implementation on fixed-point DSP. / Controle H-infinito não-linear aplicado em sistema de levitação magnética: projeto e implementação em DSP de ponto-fixo.
Sistemas de levitação magnética são inerentemente não-lineares e, quando con- trolados digitalmente, normalmente, esbarram em limitações do hardware empregado. O objetivo desta tese é apresentar aspectos teóricos e práticos durante a aplicação da teoria de controle H1 não-linear em sistemas de levitação magnética. A primeira con- tribuição
Publicado em: 2008
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27. Airborne geophysical and geological data applied to the selection of groudwater potential areas in crystalline rocks of Ceara, Brazil / Dados aerogeofisicos e geologicos aplicados a seleção de areas favoraveis para agua subterranea no dominio cristalino do Ceara, Brasil
The location of water well in Northeast Brazil is usually based on the interpretation of structural lineaments in aerial-photographs and electromagnetic and electrical resistivity ground geophysics surveys. However, the success of these techniques is variable, and the small coverage area is another limitation. This Thesis favors a different approach, the use
Publicado em: 2008
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28. APLICAÇÃO DE MATERIAIS COM MAGNETOSTRICÇÃO GIGANTE EM SENSORES DE DESLOCAMENTO SEM CONTACTO / GIANT MAGNETOSTRICTIVE MATERIALS APPLIED TO CONTACTLESS DISPLACEMENT SENSORS
Magnetostriction is a property of ferromagnetic materials to deform in the presence of a magnetic field. Magnetostriction is an inherent property of magnetic materials, which is unchangeable with time. Materials exhibiting strains in the order of 10-3 are known as giant magnetostrictive materials (GMM).In this dissertation we study the application of these m
Publicado em: 2007
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29. Monitoramento permanente de motores de indução trifasicos / On-line monitoring of three-phase induction motors
A predictive maintenance program must include several techniques of monitoring of the electric motors conditions. Among these techniques, probably the two most classic ones are related to electric current and vibration analysis. Unfortunately, in both cases inherent drawbacks make difficult their use in loco on industry plants. As there is a large range of
Publicado em: 2007
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30. Alternative technique for biodiesel quality control using an optical fiber long-period grating sensor
We report the use of an optical fiber sensor to measure the soybean oil concentration in samples obtained from the mixture of pure biodiesel and commercial soybean oil. The operation of the device is based on the long-period grating sensitivity to the surrounding medium refractive index, which leads to measurable modifications in the grating transmission spe
Química Nova. Publicado em: 2007
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31. Ligas magnéticas NiFe e NiFeCo eletrodepositadas, voltadas para aplicações em micro-sensores magnéticos tipo fluxgate planar / Electrodeposited NiFe and NiFeCo films for planar fluxgate sensors
This work presents the results about the fabrication and characterization of thin films of NiFe and NiFeCo alloys. The attempts to construct the planar fluxgate are also presented. Galvanostatic electrodeposition using an electrolytic solution containing Ni and Fe was used: NiSO4 (0,7 mol/l); NiCl2 (0,02 mol/l); FeSO4 (0,03 mol/l); H3BO3 (0,4 mol/l) and C7H5
Publicado em: 2007
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32. Polimetalates porphyrins with ruthenium phosphinics complex to application in homogeny catalyze, Non Linear Optic and Langmuir-Blodgett film preparation / Porfirinas polimetaladas com complexos periféricos de rutênio com aplicações em catálise homogênea, óptica não linear e montagem de filmes de Langmuir-Blodgett
A novel metaloporphyrin with ruthenium complexes, {H2-TPyP[RuCl(dppb)(Xbipy)] 4}(PF6)4 and {M-TPyP[RuCl(dppb)(X-bipy)]4}(PF6)4, (where M = Mn(III), Co(II) and Zn(II), X = Me- MeO- and Cl-) has been synthesized and structurally characterized by 31P{1H} magnetic resonance, UV-Vis and IR spectroscopy, cyclic voltammetry and CHN. The catalytic activity of {Mn-TP
Publicado em: 2007
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33. Investigação de ruido e sensibilidade em MAGFETs e avaliação do seu emprego no controle de emissão eletromagnetica em circuitos integrados de potencia / Investigation of noise and sensintivity in MAGFETs and its aplicationin the control of electromagnetic emissions in power integrated circuits
This work deals with the electromagnetic compatibility (EMI) issues aimed to power integrated circuits, typically DC-DC converters. An EMI controlling approach based on magnetic near field measurements using CMOS split-drain transistors (MAGFETS) as magnetic sensors is investigated. Monolithic applications can be envisaged comprising the power circuit and th
Publicado em: 2005
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34. DEVELOPMENT AND CHARACTERIZATION OF A FIELD MAGNETIC TRANSDUCER BASED ON GIANT MAGNETOIMPEDANCE EFFECT / DESENVOLVIMENTO E CARACTERIZAÇÃO DE UM TRANSDUTOR MAGNÉTICO BASEADO NO EFEITO DA MAGNETOIMPEDÂNCIA GIGANTE
In this dissertation, it is proposed the design of a magnetic field to voltage transducer based on the Giant Magnetoimpedance phenomenon (GMI), characterized by an innovative geometric configuration. In order to attain the best near-field sensibility and far-field immunity, the transducer`s sensitive element and electronic circuit were planned and implemente
Publicado em: 2005
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35. Interpretação de dados de sensores remotos e dados aerogeofisicos como ferramenta na analise estrutural da area centro-oeste do sistema transcorrente Carajas (PA) / Remote sensing and aero-geophysical datas interpretation as a tool for structural analysis of the central-western region of the Carajas Strike-Slip System
The central-western region of the Carajás Strike-Slip Fault System comprises several mineral deposits currently under exploitation by the Vale do Rio Doce Mining Company. The geological and structural understanding of this region favors prospective initiatives within the Carajás Mineral Province. Remote sensing imagery, such as JERS-1/SAR, R-99B/SAR and La
Publicado em: 2005
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36. Desenvolvimento de um medidor de fase para um sistema de biotelemetria passiva / Development of a phase meter for a passive biotelemetry system
This work describes the development of a phase measurement equipment for use in a passive biotelemetric system, whose system and measurement technique were developed before in the Biotelemetry Laboratory of the UTFPR. Based on a new technique and phase measurement system developed in this work it was possible to implement an equipment to measure the input ph
Publicado em: 2005