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06:07 Jan-19-2002

Diba Abinama

,
Joined

anyone can help me?

Dear members,
I need a answer for the followings:
What are the differences between multifrequency eddycurrent with single frequency one?
Does the MFEC use of many single frequencies (i.e. 8 frequencies) , or use of a spectrum of frequencies?

Thank you for your help.



 
01:43 Jan-19-2002

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
515
Re: anyone can help me? : Dear members,
: I need a answer for the followings:
: What are the differences between multifrequency eddycurrent with single frequency one?
: Does the MFEC use of many single frequencies (i.e. 8 frequencies) , or use of a spectrum of frequencies?
.
: Thank you for your help.
.

Difference is that you use multiple frequencies to reduce or eliminate interfering effects (e.g Tube support plate signals in the most basic application)

Normally two or more (about 4 is the most common) discrete frequencies are used.) Either simultaneous or multiplexed.

Alternatively (e.g for material property assessment) a succession of tests may be done at different freqencies (effectively a 'sweep') to give a complete picture of the reponse. This is normally only done with 'semi-static' tests




 


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