Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1982-09-08
1985-06-25
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
307309, 338 32R, G01R 3306, H01L 4308, H03K 1918
Patent
active
045256713
ABSTRACT:
A sensing element suitable for sensing two components h.sub.x and h.sub.y of an external magnetic field in an orthogonal co-ordinate system comprises a reverse C-shape first electrical conductor vacuum deposited onto an electrical insulating substrate. A layer of photoresist applied to a region insulates the conductor from a magnetoresistive element which has two connectors linked thereto. Further application of photoresist insulates the element from a second vacuum deposited electrical conductor. Wires locate with respective conductors where gold deposition in the vicinity of the wire ends achieves electrical continuity. A control circuit applies current, within a periodic cycle, in alternate directions through the first conductor while a current is applied in a single direction through the second conductor. In the following cycle the current direction through the second conductor is reversed. Values of the element electrical resistivity for the four combination of current (and hence magnetic field) directions allow solution of a simultaneous equation to yield h.sub.x and h.sub.y.
REFERENCES:
patent: 3260932 (1966-07-01), Weiss et al.
patent: 3619772 (1971-11-01), Ellis
EMI Limited
Snow Walter E.
Strecker Gerard R.
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