Device for determining the spatial position of a sensor element

Details Device for determining the spatial position of a sensor element Device for determining the spatial position of a sensor element

1996-06-20

1998-05-05

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

1286531, 32420726, 324247, 345158, 345163, G01B 7004, G01R 3302, G06K 1116, A61B 505

Patent

active

057479968

ABSTRACT:
A device for determining the spatial position of a sensor element (3) which is spatially displaceable relative to a reference element (1), includes three coils (4, 5, 6) which are arranged in the sensor element (3), consist of at least one wire turn, and are wound about a common center (7), at least three coils (2) which are arranged in the reference element (1) in spatially remote positions and consist of at least one wire turn, a current generator (11) for exciting the sensor element coils (4, 5 6) or the reference element coils (2) by means of a presettable excitation alternating current, and a processing circuit (15) for the voltages induced in the reference element coils (2) or in the sensor element coils (4, 5, 6). The processing circuit includes an arithmetic circuit which calculates, on the basis of the induced voltages, the distance coordinates x.sub.m, y.sub.m and z.sub.m of the center (7) of the sensor element coils (4, 5, 6) in a coordinate system associated with the reference element (1), as well as a feedback circuit (13) which controls the excitation currents in dependence on the amplitude of the induced voltages.

REFERENCES:
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"Magnetometer Position Indicator for Multichannel Meg" Ahlfors et al, Advances in Biomagnetism, New York, NY, pp. 693-696.

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