Low power consumption fluxmeter for determining magnetic field s

Details Low power consumption fluxmeter for determining magnetic field s Low power consumption fluxmeter for determining magnetic field s

1993-03-30

1995-10-10

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

32420726, 324260, G01R 3302, G01B 714

Patent

active

054573831

ABSTRACT:
A reduced power consumption fluxmeter is provided which is capable of measuring the effect of continued exposure to an incident magnetic field. An incident magnetic field is measured on a sampled basis by a magnetic detecting element and integrated throughout the entire duration of continued exposure. A measurement time interval between successive measurements is calculated in accordance with the variation in magnitude between successive measurements. In one embodiment, the incident field is measured in three dimensions such that the fluxmeter is not sensitive to the direction of the incident field or the orientation of the fluxmeter. An analog-to-digital converting circuit is provided for converting detected values to digital values and the successive integrations are approximated by multiplying a calculated magnetic flux strength vector by the measuring time period. The integrated values are successively added and stored in a register. The integrated value is displayed by a display element. By varying the measuring time interval in accordance with the variation between successive measurements, the inventive fluxmeter conserves energy without losing any degree of precision.

REFERENCES:
patent: 4635207 (1987-01-01), Payne
patent: 4829250 (1989-05-01), Rotier
patent: 4851775 (1989-07-01), Kim et al.
patent: 5151649 (1992-09-01), Heroux
patent: 5168222 (1992-12-01), Volsin et al.

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