Measuring and testing – Vibration – By mechanical waves
Patent
1999-03-18
2000-12-05
Chapman, John E.
Measuring and testing
Vibration
By mechanical waves
228104, G01N 2918
Patent
active
061551171
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.
REFERENCES:
patent: 4588873 (1986-05-01), Fenn et al.
patent: 5237874 (1993-08-01), Latimer et al.
patent: 5439157 (1995-08-01), Geier et al.
patent: 5537876 (1996-07-01), Davidson et al.
Berbakov Paul J.
MacLauchlan Daniel T.
Stevens Donald M.
Baraona R. C.
Chapman John E.
Edwards R. J.
Marich Eric
McDermott Technology Inc.
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