Electricity: measuring and testing – Magnetic – Displacement
Patent
1992-07-20
1993-11-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
73290V, 32420712, 32420724, G01B 714, G01F 2330
Patent
active
052587070
ABSTRACT:
A position detection probe having a magnetostrictive wire stretched between a head and a reflective foot end termination, and a magnet movable along the probe uses the sonic pulse propagation time from the magnet to the head as one parameter and the time from the magnet to the foot and reflected back to the head as another parameter for determining the magnet position. The sum of the propagation times is a constant which is used as a reference value. Upon receipt of the first two pulses the propagation times are summed and compared to the reference value, and the data is accepted if the sum is within a prescribed window around the reference value. When noise occurs, it creates a false measure of propagation time so that the sum of the propagation times is no longer equal to the reference value and the data is rejected.
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Begin John D.
Koski Richard D.
MagneTek, Inc.
Strecker Gerard R.
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