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Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.

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Technical Discussions
Mehdi Eskandarzade
Mehdi Eskandarzade
07:13 Apr-18-2008
which equipment is needed for doing an experimental setup of EMAT?

Hi,

I am interested on Electromagnetic acoustic transducers. I want to conduct some experimental runs on EMATs application in characterization of pipewalls. could you please inform me whick equipment will be needed exactly?
Regards



    
 
 
Axel Lemarchand
Sales, - - -
Ultra RS, France, Joined Apr 2008, 2

Axel Lemarchand

Sales, - - -
Ultra RS,
France,
Joined Apr 2008
2
05:02 Apr-21-2008
Re: which equipment is needed for doing an experimental setup of EMAT?
Hi,
In depends on your exact needs, could you precise it please.
Regards

----------- Start Original Message -----------
: Hi,
: I am interested on Electromagnetic acoustic transducers. I want to conduct some experimental runs on EMATs application in characterization of pipewalls. could you please inform me whick equipment will be needed exactly?
: Regards
------------ End Original Message ------------




    
 
 
Mark Potter
R & D
Sonemat Ltd., United Kingdom, Joined Sep 2007, 7

Mark Potter

R & D
Sonemat Ltd.,
United Kingdom,
Joined Sep 2007
7
06:37 Apr-21-2008
Re: which equipment is needed for doing an experimental setup of EMAT?
----------- Start Original Message -----------
: Hi,
: I am interested on Electromagnetic acoustic transducers. I want to conduct some experimental runs on EMATs application in characterization of pipewalls. could you please inform me whick equipment will be needed exactly?
: Regards
------------ End Original Message ------------

It really depends on a number of circumstances; The easiest case would be doing thickness measurements on magnetostrictive oxide coated boiler tubes at room temperature, in which case a simple shear wave EMAT probe plugged into a normal flaw detector would work OK.

For thickness gauging on a more general range of pipes however you would most likely want a dedicated pre-amplifier at least (since EMATs tend to have high loss compared with piezos). Signal averaging also helps in difficult materials such as austenitic stainless steel.

If you want to send waves along the pipe rather than just through the wall, you would also need (as well as more specialised EMAT probes) some sort of pulse generator capable of knocking out the high current/relatively low frequencies required for various wavemodes. That could be either a toneburst or a broadband pulse generator.

Check the link for some of the equipment we provide.

Sincerely,

Mark Potter




    
 
 

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