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- since 1996 -

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Career Discussions
Cesar
Cesar
07:48 Jun-13-2005
Material classification

I have tried to classify the same object from diferent materials (wood , aluminium and wood) with 200 khz transducers, with no luck yet, is there anyone who has worked in material classification? or have any idea why i've not been able to classify betwen these materials.

thanks in advanced.


    
 
 
John Hansen
Director, - Eddy Current Technology
ETher NDE Ltd, United Kingdom, Joined Oct 1999, 73

John Hansen

Director, - Eddy Current Technology
ETher NDE Ltd,
United Kingdom,
Joined Oct 1999
73
05:26 Jun-14-2005
Re: Material classification
In Reply to S V Swamy at 16:31 Nov-26-2011 .

What test method are we talking about here?

Regards

John Hansen

----------- Start Original Message -----------
: I have tried to classify the same object from diferent materials (wood , aluminium and wood) with 200 khz transducers, with no luck yet, is there anyone who has worked in material classification? or have any idea why i've not been able to classify betwen these materials.
: thanks in advanced.
------------ End Original Message ------------




    
 
 
Cesar
Cesar
03:46 Jun-14-2005
Re: Material classification
In Reply to Gary Ellison at 18:48 Sep-08-2015 .

----------- Start Original Message -----------
: What test method are we talking about here?
: Regards
: John Hansen

I'm using a pair of air coupled transducers, about 5 cm from the object. I thougth that I was going to obtain different envelopes from these materials, but I get the same response.


    
 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 153

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
153
00:44 Jun-16-2005
Re: Material classification
How large are the objects that you are trying to test?
What frequency are the transducers?
Have you checked to see what the sound enevelope is like when there is no object between the transducers?

I have found that in some instances sound will take the path of least resistance which could be around the object.
Regards

Neil Burleigh
----------- Start Original Message -----------
: : What test method are we talking about here?
: : Regards
: : John Hansen
: I'm using a pair of air coupled transducers, about 5 cm from the object. I thougth that I was going to obtain different envelopes from these materials, but I get the same response.
------------ End Original Message ------------




    
 
 

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