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Velocity Sensing with a Hall Probe

IP.com Disclosure Number: IPCOM000096793D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Hill, YM: AUTHOR

Abstract

The velocity of a uniform strip or sheet 10 of a conductive metal moving in its own plane is accurately sensed. Strip 10 is subjected to a magnetic field. Such is produced in gap 12 of permanent magnet 14 and is perpendicular to the plane of strip 10. This field induces eddy currents 16 in moving strip 10. Such, in turn, produce external magnetic field 18. This is substantially orthogonal to the original magnetic field.

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Velocity Sensing with a Hall Probe

The velocity of a uniform strip or sheet 10 of a conductive metal moving in its own plane is accurately sensed. Strip 10 is subjected to a magnetic field. Such is produced in gap 12 of permanent magnet 14 and is perpendicular to the plane of strip 10. This field induces eddy currents 16 in moving strip 10. Such, in turn, produce external magnetic field 18. This is substantially orthogonal to the original magnetic field.

Hall probe 20 which is sensitive to the direction of a field is used. Probe 20 is rotated so as to be insensitive to the original magnetic field and the strength of field 18 can be measured. As this field is proportional to the strip velocity, a measure of the strip speed is readily obtained without requiring physical contact with strip 10. The necessity for narrow air gaps is avoided.

Because probe 20 has an instantaneous response, velocity transients can also be measured accurately.

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