Non-destructive, non-contact ultrasonic material testing...

Details Non-destructive, non-contact ultrasonic material testing... Non-destructive, non-contact ultrasonic material testing...

G - Physics

01

N

349/35

G01N 29/00 (2006.01)

Patent

CA 1189947

ABSTRACT OF THE DISCLOSURE There is disclosed a method for non-contact, non-destructive testing of a -test body of ferromagnetic and/or electrically-conductive material with ultrasound waves, including the steps of producing in a near- surface region of the test body a low-frequency alterna- ting magnetic bias field having flux lines generally parallel to a surface of the test body, producing high frequency alternating magnetic excitation fields in the near-surface region generally parallel to the surface during a time interval when the bias field is at a quasi-static maximum, adjacent excitation fields having opposing polarity and having flux lines lying in mutually parallel directions, whereby ultrasound waves are gen- erated in the test body and detecting high frequency alternating magnetic fields in the near-surface region during the same time interval when the bias field is at a quasi-static maximum and producing a signal therefrom representative of the ultrasound waves.

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