Electricity: measuring and testing – Magnetic – Displacement
Patent
1993-02-18
1995-04-11
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420713, 32420724, 73290V, G01B 714, G01F 2330, G01R 3500
Patent
active
054062004
ABSTRACT:
In a position detection probe having a magnetostrictive wire stretched between a head and a reflective foot end termination, and a magnet displaceable along the probe and using the sonic pulse propagation time from the magnet to the foot end termination as a position detection parameter, compensation for thermal expansion and thermal change of propagation velocity is made by measuring the wire resistance and calculating a compensation from the resistance. The probe is excited by an electrical pulse having a known current. The voltage across the wire is measured at a time when the current has stabilized to a precise value, and resistance is determined from the current and voltage.
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Begin John D.
Koski Richard D.
MagneTek Controls, Inc.
Patidar Jay M.
Snow Walter E.
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