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- since 1996 -

Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.
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vladimir perez
vladimir perez
02:53 Sep-28-2007
multi echo

Hi everybody...........I'd like to know about "use of multi-echo equipment" to make thickness measurements on coatings.

Please, can someone send any informations about that?

please send at: enimsa.tpa@gmail.com

thanks

Eng. Vladimir Perez P.



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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
06:08 Oct-01-2007
Re: multi echo
Multi-echo measurement, more commonly known as echo-to-echo measurement, is a technique that is available on many ultrasonic thickness gages and flaw detectors, used to measure the thickness of a metal substrate beneath a non-metallic coating without including the coating thickness. In that sort of situation (like thick paint over a steel pipe), there will be multiple backwall echoes from the metal but only a single echo from the coating. The time interval between any two of the metal backwall echoes represents one round trip of the sound wave in the metal, so by measuring that interval the instrument measures the metal thickness only.


 
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