Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1990-01-18
1992-07-28
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324174, 32420721, 324236, 331 65, G01R 3306, G01P 3487, G01P 3488
Patent
active
051343711
ABSTRACT:
A magnetic detection device including at least one oscillator circuit having a magnetoresistance element which converts a change of magnetism detected into a digital signal and a comparator for comparing the digitalized oscillating frequency of the oscillator circuit with another digitalized oscillating frequency generated from another oscillating circuit by taking a ratio thereof or by detecting a phase difference between the pulse signals. Utilizing the magnetic detection device, the amount of change of magnetism can be stably detected with a high accuracy within a wide range of ambient usage temperatures.
Also, a physical quantity detection device including the magnetic detection device which can detect any physical quantity with a high accuracy.
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Hattori Tadashi
Hoshino Kouichi
Matsumoto Muneaki
Nakamura Katsumi
Ohsawa Masanori
Nippon Soken Inc.
Nippondenso Co. Ltd.
Strecker Gerard R.
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