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Martin A M Gijs - One of the best experts on this subject based on the ideXlab platform.

  • printed circuit board integrated fluxgate sensor
    Sensors and Actuators A-physical, 2000
    Co-Authors: O Dezuari, S E Gilbert, E Belloy, Martin A M Gijs
    Abstract:

    We have developed a cheap and simple trilayer printed circuit board (PCB)-based technology, adapted for the fabrication of fluxgate Magnetic sensors. The two outer layers of the PCB stack comprise the electrical windings of the fluxgate, while the inner layer is made of patterned amorphous Magnetic core with extremely high Relative Magnetic Permeability (µr100,000). The output voltage and the sensitivity of the fluxgate devices have been studied as a function of the external field and of the geometry of the Magnetic core. We have found a Relatively high sensitivity of 18 V/T at an excitation current frequency of 10 kHz. The results obtained clearly show the potential of this miniaturised fluxgate device for application as a Magnetic field sensor. Keywords: Fluxgate sensor; Sensitivity; High Permeability; Compass; Vitrovac®; Printed circuit board (PCB)

  • High inductance planar transformers
    Sensors and Actuators A-physical, 2000
    Co-Authors: O Dezuari, S E Gilbert, E Belloy, Martin A M Gijs
    Abstract:

    We have developed a new printed circuit board PCB technology adapted for the fabrication of ultra-flat microtransformers. The two outer layers of the PCB stack comprise the electrical windings of the inductive devices, while the inner layer is made of a micro-patterned . amorphous Magnetic ribbon with extremely high Relative Magnetic Permeability m f 100,000 . The electrical properties of the toroidal r microtransformers have been studied as a function of frequency. Inductances were found to be as much as 30 mH at 1 kHz, a Relatively high value compared to microtransformers of similar size. Despite a Relatively high leakage flux, the voltage transformation efficiency is measured at 89%. The high performance of these devices is primarily due to the use of the high Permeability Magnetic core. q 2000 Elsevier Science S.A. All rights reserved.

Min Wang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Research on Non-Magnetic Steel 30Mn27Al4V
    Advanced Materials Research, 2012
    Co-Authors: Chang-sheng Li, Xin Fang Xu, Biao Ma, Min Wang
    Abstract:

    Non-Magnetic steels are required in energy and transportation fields such as superconducting energy storage equipment, Magnetic liquid power generation equipment, superconducting generators, superconducting power transmission and ship electroMagnetic propulsion. Experimental research on steel making, hot rolling, solution and aging for non-Magnetic steel 30Mn27Al4V was carried out in the laboratory. The microstructure evolution was observed and the mechanical property and Relative Magnetic Permeability were tested after heat treatment. The effects of fine particles such as VC, VN and V(CN) dispersively distributed in austenite matrix on precipitation, grain refinement and austenitic nucleation were analyzed. The microstructure of the tested steel is austenite. The grain size is 24~28μm. At room temperature, the yield strength and tension strength are 556 MPa and 701 MPa, elongation after fracture of the steel is 47%, the yield ratio is 0.79, strength and ductility product is 32.9 GPa%. After solution and aging treatment, the steel shows a yield strength of 325~371 MPa, tension strength of 550~645 MPa, elongation of 58~78 %, a yield ratio of 0.54~0.60, strength and ductility product of 36.3~46.3 GPa%. The Relative Magnetic Permeability is below 1.005. The results indicate that the tested steel exhibits good mechanical property and non-magnetism. It has no elements of Ni and Cr, so it just needs simple process flow and lower production cost. The numerous applications of the steel in industry can create great economic benefits.

  • Experimental Research on Non-Magnetic Steel 30Mn27Al4V
    Advanced Materials Research, 2012
    Co-Authors: Chang-sheng Li, Xin Fang Xu, Biao Ma, Min Wang
    Abstract:

    Non-Magnetic steels are required in energy and transportation fields such as superconducting energy storage equipment, Magnetic liquid power generation equipment, superconducting generators, superconducting power transmission and ship electroMagnetic propulsion. Experimental research on steel making, hot rolling, solution and aging for non-Magnetic steel 30Mn27Al4V was carried out in the laboratory. The microstructure evolution was observed and the mechanical property and Relative Magnetic Permeability were tested after heat treatment. The effects of fine particles such as VC, VN and V(CN) dispersively distributed in austenite matrix on precipitation, grain refinement and austenitic nucleation were analyzed. The microstructure of the tested steel is austenite. The grain size is 24~28μm. At room temperature, the yield strength and tension strength are 556 MPa and 701 MPa, elongation after fracture of the steel is 47%, the yield ratio is 0.79, strength and ductility product is 32.9 GPa%. After solution and aging treatment, the steel shows a yield strength of 325~371 MPa, tension strength of 550~645 MPa, elongation of 58~78 %, a yield ratio of 0.54~0.60, strength and ductility product of 36.3~46.3 GPa%. The Relative Magnetic Permeability is below 1.005. The results indicate that the tested steel exhibits good mechanical property and non-magnetism. It has no elements of Ni and Cr, so it just needs simple process flow and lower production cost. The numerous applications of the steel in industry can create great economic benefits.

C.i. Ager - One of the best experts on this subject based on the ideXlab platform.

  • Low Permeability reference standards with improved high Magnetic field strength performance
    IEE Proceedings - Science Measurement and Technology, 1998
    Co-Authors: M.j. Hall, S A C Harmon, A.e. Drake, C.i. Ager
    Abstract:

    Commercial instruments for determining the Relative Magnetic Permeability of weakly Magnetic materials require traceable calibration. This is achieved using reference standards of known Permeability. These materials suffer to some extent from the fact that their Relative Magnetic Permeability varies with the applied Magnetic field strength. When used to calibrate instruments, this can introduce significant errors. The authors report on the development of a material which improves this situation. By uniformly dispersing iron particles in an acrylic matrix their self demagnetising properties are substantially retained and, consequently, the Permeability changes due to applied field are significantly smaller than for conventional materials. Furthermore, because the amount of iron added can be varied, the Permeability can be tailored to the required value. This allows commercial instruments to be calibrated at various points of their ranges or at a particular value of interest. Using this technique it was possible to make reference materials with permeabilities in the range 1.005 to 1.100.

  • Report on the development of low Magnetic Permeability reference materials.
    1993
    Co-Authors: A.e. Drake, C.i. Ager
    Abstract:

    A study has been carried out to select suitable reference materials for the calibration of Magnetic Permeability measuring instruments over their normal working range of Relative Magnetic Permeability of 1.0025 to 1.4. With the exception of some of the rare earth elements, the Permeability of the elements is below the lower limit of this range. It was necessary, therefore, to investigate metallic alloys and composites. As a result, three Magnetic alloys were selected on grounds of their stability and uniformity of composition.

  • Reference materials for calibrating Magnetic Permeability measuring equipment
    IEEE Transactions on Magnetics, 1990
    Co-Authors: A.e. Drake, C.i. Ager
    Abstract:

    The measurement and comparison of the Relative Magnetic Permeability of weakly Magnetic materials at different field strengths by an absolute method and by commercial instrumentation have been undertaken in order to provide reference materials for the calibration of these instruments. The absolute measurement method is described, the main types of commercial instruments are reviewed, and a variety of metals and alloys are examined for possible use as reference standards. The measurements are described, and typical results for Permeability measurements using commercial instruments and the absolute method are given. The problems that the users of Permeability measuring equipment encounter both in their calibration and in their operation are highlighted. >

  • Low Permeability reference standards with improved high Magnetic field strength performance
    1998 Conference on Precision Electromagnetic Measurements Digest (Cat. No.98CH36254), 1
    Co-Authors: M.j. Hall, S A C Harmon, A.e. Drake, C.i. Ager
    Abstract:

    Commercial instruments for determining the Relative Magnetic Permeability of weakly Magnetic materials require traceable calibration. This is achieved using reference standards of known Permeability. These materials suffer to some extent from the fact that their Relative Magnetic Permeability varies with the applied Magnetic field strength. When used to calibrate instruments, this can introduce significant errors. We will report the development of a material which improves this situation. By uniformly dispersing iron particles in an acrylic matrix their self demagnetized properties are substantially retained and consequently the Permeability changes with applied field are significantly smaller than for conventional materials.

O Dezuari - One of the best experts on this subject based on the ideXlab platform.

  • printed circuit board integrated fluxgate sensor
    Sensors and Actuators A-physical, 2000
    Co-Authors: O Dezuari, S E Gilbert, E Belloy, Martin A M Gijs
    Abstract:

    We have developed a cheap and simple trilayer printed circuit board (PCB)-based technology, adapted for the fabrication of fluxgate Magnetic sensors. The two outer layers of the PCB stack comprise the electrical windings of the fluxgate, while the inner layer is made of patterned amorphous Magnetic core with extremely high Relative Magnetic Permeability (µr100,000). The output voltage and the sensitivity of the fluxgate devices have been studied as a function of the external field and of the geometry of the Magnetic core. We have found a Relatively high sensitivity of 18 V/T at an excitation current frequency of 10 kHz. The results obtained clearly show the potential of this miniaturised fluxgate device for application as a Magnetic field sensor. Keywords: Fluxgate sensor; Sensitivity; High Permeability; Compass; Vitrovac®; Printed circuit board (PCB)

  • High inductance planar transformers
    Sensors and Actuators A-physical, 2000
    Co-Authors: O Dezuari, S E Gilbert, E Belloy, Martin A M Gijs
    Abstract:

    We have developed a new printed circuit board PCB technology adapted for the fabrication of ultra-flat microtransformers. The two outer layers of the PCB stack comprise the electrical windings of the inductive devices, while the inner layer is made of a micro-patterned . amorphous Magnetic ribbon with extremely high Relative Magnetic Permeability m f 100,000 . The electrical properties of the toroidal r microtransformers have been studied as a function of frequency. Inductances were found to be as much as 30 mH at 1 kHz, a Relatively high value compared to microtransformers of similar size. Despite a Relatively high leakage flux, the voltage transformation efficiency is measured at 89%. The high performance of these devices is primarily due to the use of the high Permeability Magnetic core. q 2000 Elsevier Science S.A. All rights reserved.

Rémi Vaillancourt - One of the best experts on this subject based on the ideXlab platform.

  • Series solution of an eddy-current problem for a sphere with varying conductivity and Permeability profiles
    IEEE Transactions on Magnetics, 1999
    Co-Authors: Andrei A. Kolyshkin, Rémi Vaillancourt
    Abstract:

    Two-parameter families of analytical solutions are found for a single-turn coil symmetrically located above a two-layer sphere. Several cases are considered where the conductivity and Relative Magnetic Permeability of the outer spherical layer are functions of the distance /spl rho/ from the sphere's center. The change in impedance of the coil is obtained in terms of a series containing Bessel functions. Computational impedance results are presented for different values of the parameters of the problem and the exact conductivity and Permeability profiles are given diagrammatically for comparison with the impedance results.

  • Analytical solutions to eddy-current testing problems for a layered medium with varying properties
    IEEE Transactions on Magnetics, 1997
    Co-Authors: Andrei A. Kolyshkin, Rémi Vaillancourt
    Abstract:

    A one-parameter family of analytical solutions is found for the case where a single-turn coil is located above a two-layer conducting medium. The conductivity /spl sigma/ and the Relative Magnetic Permeability /spl mu/ of the upper conducting layer are constants, while for the lower conducting half-space, these are of the form /spl sigma/(z)=Az/sup b/ and /spl mu/(z)=Bz/sup a/, where A and B are constants and a+b=-2 or a+b=0. The change in impedance is computed, and the results of numerical simulation are presented.

  • Impedance of a single-turn coil due to a double-layered sphere with varying properties
    IEEE Transactions on Magnetics, 1995
    Co-Authors: Andrei A. Kolyshkin, Rémi Vaillancourt
    Abstract:

    This paper presents an analytical solution for the change in impedance in a coil due to the presence of a conducting double-layered sphere symmetrically situated with respect to the coil. In the case where the Relative Magnetic Permeability, /spl mu/(r)=r/sup /spl alpha//, of the outer sphere is a function of the distance r from the center of the sphere, where a is an arbitrary real number, the solution is expressed in the form of a series containing Bessel functions and can be used to compute the change of impedance. Numerical results for the case /spl alpha/=-2 are presented. >