Edge detection and seam tracking with emats

Details Edge detection and seam tracking with emats Edge detection and seam tracking with emats

G - Physics

01

H

G01H 7/00 (2006.01) G01N 29/04 (2006.01) G01N 29/24 (2006.01)

Patent

CA 2298085

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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