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- since 1996 -
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Technical Discussions
Jack Tensen
Jack Tensen
17:07 Apr-14-2009
Surface waves on hot steel plates

Dear readers,

I am looking for a way to use surface Rayleigh waves on hot steel plates (150-180 degr. C.)
I am thinking on coupling the sound in the plate by means of a squirter and a high water flow.
The probe is positioned about 3-4 cm above the plate and water flows through the squirter over the plate. Iam not sure this will work specially for the Rayleigh waves travelling over the steel/water boundary?
Has anyone experience with this or other suggestions? please I like to know

    
 
 Reply 
 
Borja
Director
Innerspec Technologies, USA, Joined Jun 2002, 36

Borja

Director
Innerspec Technologies,
USA,
Joined Jun 2002
36
20:40 Apr-14-2009
Re: Surface waves on hot steel plates
In Reply to Jack Tensen at 17:07 Apr-14-2009 (Opening).

EMAT is a very good option for generating ultrasound on hot materials, and it is especially well suited for generation of guided waves (including surface waves). You can visit www.innerspec.com for additional information.

    
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
20:53 Apr-14-2009
Re: Surface waves on hot steel plates
In Reply to Jack Tensen at 17:07 Apr-14-2009 (Opening).

I have never tried the test at high temperature, but at normal environmental temperatures the water on the surface of the metal can be an issue. An incident longitudinal wave in a water column at the correct angle will generate a Rayleigh wave in steel, but the Rayleigh wave will be very quickly dampened by the water on the surface, and not travel very far before dissipating. That may be a problem depending on the specific sensitivity and sound path length requirements of your test.

    
 
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