Electricity: measuring and testing – Magnetic – Stress in material measurement
Reexamination Certificate
2005-12-06
2005-12-06
Ledynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Stress in material measurement
C073S799000, C073S862690
Reexamination Certificate
active
06972560
ABSTRACT:
A method for detecting a change in permeability of a magnetostrictive object due to a change in strain. At least one first coil and at least one second coil are obtained and positioned such that magnetic flux lines induced by an electric current in the first coil(s) pass through at least one portion of the object in a direction substantially parallel to the strain direction, such that magnetic flux lines induced by an electric current in the second coil(s) pass through at least one portion of the object in a direction substantially parallel to the strain direction, and such that any electromagnetic interference sensed by the first coil(s) is sensed oppositely by the second coil(s). The total inductance of the positioned first and second coil(s) is measured over time. A change in permeability of the object is detected from a change in the measured total inductance over time.
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Baudendistel Thomas A.
Cyran Curtis
Disser Robert J.
Delphi Technologies Inc.
Ledynh Bot
Smith Michael D.
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