Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1996-10-21
1998-08-11
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324174, 32420725, 324255, G01R 3304, G01P 342, G01P 3487, G01P 3489
Patent
active
057932085
ABSTRACT:
A magnetic sensor includes a magnetic core, an excitation coil, an oscillator and an excitation circuit, a detection coil, and a latch circuit. The excitation coil is wound on the magnetic core. The oscillator and the excitation circuit repeatedly supply a rectangular wave excitation current having a given polarity to the excitation coil. The detection coil is wound on the magnetic core on which the excitation coil has been wound. The detection coil generates an output signal having peaks of opposite polarities corresponding to magnitudes of a target measurement magnetic field in response to leading and trailing edges of the rectangular wave excitation current. The latch circuit receives an output signal having a predetermined polarity and generated by the detection coil, monitors a supply state of the excitation current obtained when a peak of the output signal having the predetermined polarity exceeds a predetermined threshold, and holds and outputs a signal corresponding to the supply state of the excitation current.
REFERENCES:
patent: 3568052 (1971-03-01), Anderson
patent: 4290018 (1981-09-01), Rhodes
patent: 4303886 (1981-12-01), Rhodes
patent: 4480226 (1984-10-01), Kuno et al.
patent: 4748408 (1988-05-01), Itakura
Allen Kenneth R.
Jeco Co., Ltd.
Strecker Gerard R.
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