Improved emat probe and technique for weld inspection

Details Improved emat probe and technique for weld inspection Improved emat probe and technique for weld inspection

G - Physics

01

N

G01N 29/24 (2006.01) B06B 1/04 (2006.01) G01N 29/10 (1995.01)

Patent

CA 2144597

A method and apparatus of inspecting for flaws in a specular reflector, where the flaws having an expected length and the reflector is electrically conductive. The method comprises directing a beam of an electromagnetic acoustic transmitting transducer along a beam axis toward the specular reflector for producing a reflected electromagnetic acoustic beam. The transmitted beam has side lobes with zero points therebetween, at least some of the side lobes being major side lobes. The reflected beam is received using an electro-magnetic acoustic receiving transmitter set at an angle to the beam axis, the angle being selected to be at one of the zero points and passed all of the major lobes of the transmitted beam to eliminate root and crown signals of the weld, in the reflected signal.

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