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Sonotron NDT
Original developer and manufacturer of advanced ultrasonic instruments
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Technical Discussions
Saju
Saju
11:36 Dec-08-2009
Mode conversion of shear waves in immersion testing

Hi All

I read in immersion testing of tubulars we use longitudinal waves to generate shear waves in the test part either by offsetting the probe or angulating it. But when a defect is encountered in the test part , how does the reflected shear waves return to the probe? Is there a mode conversion happens at the test part / water interface to produce longitudial waves , since the shear wave can't pass through liquids?

 
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Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 526

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
526
13:04 Dec-08-2009
Re: Mode conversion of shear waves in immersion testing
In Reply to Saju at 11:36 Dec-08-2009 (Opening).

Yes exactly, it goes back the way it came, From water to steel you get a mode conversion to Shear, The from steel to water you get the opposite. Obviously some of the energy is lost at each interface.

 
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