Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1987-11-17
1989-09-05
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
194317, 324249, 324260, 34082534, 360111, G01R 3305, G07D 700, G11B 5335
Patent
active
048642380
ABSTRACT:
A device for measuring a weak magnetic field is disclosed. The device includes a substrate, a magnetic core having a high magnetic permeability and in the form of a surface film on a substrate, and at least two coils magnetically coupled to the magnetic core. A pulse generator is connected to one of the coils and is used to drive the magnetic core into intermittent saturation. The other coil is used to generate an output signal. The device can be used for measuring the weak magnetic fields associated with bank notes for identifying the values of the bank notes.
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LGZ Landis & Gyr
Strecker Gerard R.
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