Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1981-06-03
1985-05-14
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
338 32R, G01R 3302
Patent
active
045175152
ABSTRACT:
A magnetic-field detection device useful as a sensitive magnetometer. The device employs a solid-state field-sensing element which experiences a change in permeability when it is exposed to a magnetic field. The change in permeability results in a change in skin depth and therefore in resistance offered by the element to passage of a high-frequency alternating current. The element is used as one arm of a balanced bridge circuit to which an A.C. voltage is applied. Upon exposure to a magnetic field, the bridge is rebalanced to a null, the amount of current flow or rebalancing being measures of the magnetic field strength.
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Wohlfarth, "Ferromagnetic Materials", Jul. 1981, pp. 121-124, North-Holland ublishing Co.
Hart Lynn
Reinitz Karl
Beers Robert F.
Branning Arthur L.
McDonnell Thomas E.
Snow Walter E.
Strecker Gerard R.
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