Magnetic noise rejection apparatus and magnetic field measurement apparatus
US10444298B2 · kind B2 · utility
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3References
9Claims
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Key dates
| Filing date | Dec 22, 2016 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Dec 22, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0029
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a magnetic noise rejection apparatus which includes: a plurality of cancellation coils arranged near a target object; a plurality of magnetic sensors disposed inside the respective cancellation coils; an adder circuit configured to take a sum of outputs of the plurality of magnetic sensors; and a feedback control circuit configured to supply the cancellation coils with such a common feedback drive current that the sum of the outputs of the magnetic sensors is equal to a sum of outputs of the magnetic sensors under a zero magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.