Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1998-07-17
2000-11-07
Patidar, Jay
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324 96, 324244, G01R 3300
Patent
active
061441961
ABSTRACT:
A magnetic measuring apparatus measures, at a high spatial resolution, a magnetic field generated by a current flowing in one of a plurality of highly packed parallel wires on a printed-circuit board. The magnetic measuring apparatus includes a magnetic field detector for detecting a magnetic field generated by a current flowing in one of a plurality of parallel wires, a measuring unit for measuring a magnetic field intensity based on an output signal from the magnetic field detector, an input unit for entering a pitch of the parallel wires and a spatial resolution characteristic of the magnetic field detector, a processor for calculating a height of the magnetic field detector from the one of the parallel wires based on the pitch of the parallel wires and the spatial resolution characteristic, and a scanning device for scanning the magnetic field detector into a position determined by the processor. The height of the magnetic field detector is adjusted such that a location where magnetic fields generated by a current flowing in one of the wires and a mirror-image current symmetrical with respect to a ground surface cancel each other is brought into agreement with the position of an adjacent wire, for thereby suppressing the effect of a magnetic field from the adjacent wire.
REFERENCES:
patent: 4324255 (1982-04-01), Barach et al.
Takashi Harada et al., "Time Domain Magnetic Field Waveform Measurement Near Printed Circuit Boards", T. IEE Japan, vol. 117-A, No. 5, 1997, pp. 523-530.
John D. Dyson, "Measurement of Near Fields of Antennas and Scatters", IEEE Transaction on Antennas and Propagation, vol. AP-21, No. 4, Jul. 1973, pp. 446-460.
NEC Corporation
Patidar Jay
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