Edge detection and seam tracking with EMATs
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United States of America Patent
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-
Dec 5, 2000
Issued Date -
N/A
app pub date -
Mar 18, 1999
filing date -
Mar 18, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method for detecting the location of an edge, interface, seam or other structure of a workpiece uses one or two electromagnetic acoustic transducers (EMATs) to transmit an ultrasonic wave along the workpiece toward the edge and to receive a reflected wave. The velocity of the wave in the material is used in conjunction with the round trip time-of-flight (TOF) of the transmitted and reflected wave, to calculate the location of the edge. This is done by placing the transducer or transducers at known locations on the workpiece. A surface wave or 90 degree shear wave can be utilized and no contact is needed between the transducer and the surface of the workpiece. Rough and/or dirty surfaces and hostile environments can be accommodated while practicing the invention.
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