Method and apparatus for detecting the position of an edge of a test piece
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United States of America Patent
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Mar 28, 1989
Grant Date -
N/A
app pub date -
Oct 8, 1986
filing date -
Oct 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for use with a measuring and/or control device having at least one sensor based on eddy current induction and movable over a test piece and supplied with at least two carrier frequency signals. A determination is made on one of the carrier frequency signals with respect to those signal changes obtained at the transistion from measuring against the test piece to measuring against essentially empty space. When such signal changes occur an edge signal is generated which indicates that the measuring and/or control device has passed over an edge of the test piece.
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