Electromagnetic acoustic transducer (EMAT) inspection of tubes f

Details Electromagnetic acoustic transducer (EMAT) inspection of tubes f Electromagnetic acoustic transducer (EMAT) inspection of tubes f

1999-02-03

2000-12-26

Williams, Hezron

Measuring and testing

Vibration

By mechanical waves

73622, 73598, 376249, G01N 2908, G01N 2928

Patent

active

061641375

ABSTRACT:
An EMAT testing device for nondestructively testing tubes for surface defects and displaying the results has a EMAT transmitter arranged collinear with a pair of EMAT receivers. The EMAT receivers each receive a pair of oppositely propagating circumferential acoustic surface waves from the transmitter at different times and the relative amplitudes of the received waves are compared to located defects adjacent the receivers in the tube.

REFERENCES:
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patent: 4843884 (1989-07-01), House et al.
patent: 5085082 (1992-02-01), Cantor et al.
patent: 5113697 (1992-05-01), Schlawne
patent: 5679898 (1997-10-01), Sclawne et al.
patent: 5763786 (1998-06-01), Camplin et al.
patent: 5767408 (1998-06-01), Lindgren et al.

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