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Technical Discussions
Shree
Shree
06:22 Sep-27-2017
T.R probe Having echo between first and second Backwall

I Having 10 focal length Twin Crystal probe, when try to measuring on 25mm thickness having unknown echo between first and second Backwall,

What is reason behind this echo

    
 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 189

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
189
11:39 Sep-27-2017
Re: T.R probe Having echo between first and second Backwall
In Reply to Shree at 06:22 Sep-27-2017 (Opening).

Mode conversion. Dual crystal transducers emit sound at a slight angle. When longitudinal waves strike the back surface, a shear wave is generated at a relatively low amplitude.

Typically, you don't use dual crystal transducers to resolve multiple echoes.

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