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Technical Discussions
Sooraj
NDT Inspector, PAUT, TOFD and AUT
bureauveritas, India, Joined Oct 2016, 7

Sooraj

NDT Inspector, PAUT, TOFD and AUT
bureauveritas,
India,
Joined Oct 2016
7
17:02 Jul-24-2017
Shear wave probe

Hai,

I need some clarity on shear wave probes.i read on some NDT books that some crystals can make shear wave directly(X cut or Y cut crystal not sure).but my friend who is is paut technician said that it is not possible to make shear wave directly ,only can make by mode conversion of longitudinal waves.

But I seen some shear wave probe on AUT, he says longitudinal waves mode converted probe itself to shear wave. Any one please help on this

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 747

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
747
18:19 Jul-24-2017
Re: Shear wave probe
In Reply to Sooraj at 17:02 Jul-24-2017 (Opening).

Yes, by the right cut you can produce shear waves directly. But the mode being shear like rubbing, requires a highly viscous couplant like molasses or honey. So it's use is limited to special applications only.

 
 Reply 
 
Hamid Reza
,
Canada, Joined Oct 2016, 68

Hamid Reza

,
Canada,
Joined Oct 2016
68
04:06 Jul-25-2017
Re: Shear wave probe
In Reply to Anmol Birring at 18:19 Jul-24-2017 .

Dear Sooraj,

In addition to what Mr. Birring said, probes with y-cut crystals can also be permanently glued/bonded to the surface. Permanent bonding is especially useful in applications that require real-time monitoring or where it is not possible for technician to carry out the inspection (e.g. due to radiation hazard).

Why not bonding the x-cut crystals instead? Because in some applications, it might not be possible to use certain materials. For example in high temperature applications PZT is not an option, instead Lithium Niobate with the curie temperature of ~ 1150 C can be used without worrying about the temperature related damage. With Lithium Niobate, x-cut is not piezoelectric, but y-cut and z-cut are! That is one of the reasons why sometimes permanently bonded y-cut crystals are useful.

Sincerely,
Hamid Reza

 
 Reply 
 

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