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- since 1996 -
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Technical Discussions
Kaveh Edalati
Kaveh Edalati
06:28 May-28-2006
Frequency of probe for ET of tubes

Dear friends
I'm working on eddy current testing of tube. How I should determine the frequency of probe?
Assume tube thickness is= 1 mm, outside diameter= 20 mm and material of tube is copper alloy.
Regards
Kaveh

Ikesh Patel
Ikesh Patel
03:26 Jun-18-2006
Re: Frequency of probe for ET of tubes
Dear Mr.Kavesh
You can use the formula,
F90= 3 x Conductivity / txt
Which will give you center optimum frequency.
Frequency is related to thickness and material only. Its nothing to do with diameter.
Thanks.
Ikesh Patel.

Thongchai
Thongchai
03:04 Nov-02-2017
Re: Frequency of probe for ET of tubes
In Reply to Ikesh Patel at 03:26 Jun-18-2006 .

Dear Mr.Ikesh Patel
Sorry, i need to know ''F90'' what meaning please give me information.
Regards
Thongchai

Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 791

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
791
23:48 Nov-02-2017
Re: Frequency of probe for ET of tubes
In Reply to Kaveh Edalati at 06:28 May-28-2006 (Opening).

which copper alloy ?

Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 877

Michel Couture

NDT Inspector,
consultant,
Joined Sep 2006
877
12:21 Nov-03-2017
Re: Frequency of probe for ET of tubes
In Reply to Thongchai at 03:04 Nov-02-2017 .

F90 is the frequency where the ID and OD notch on your calibration tube will be at 90 degrees from each other. The ID horizontally and OD vertically.

deepjyotidassoccer@gmail.com
,
India, Joined Aug 2016, 23

deepjyotidassoccer@gmail.com

,
India,
Joined Aug 2016
23
04:35 Nov-05-2017
Re: Frequency of probe for ET of tubes
In Reply to Michel Couture at 12:21 Nov-03-2017 .

Sir, please can u reply to some of my queries regarding Ect

1.while doing calibration,most of the time absolute channels will not get calibrated. What is the reason for that?
2.What is probe saturation?
3.In many cases, D90 channel will show a defect but the mixed channel will not show it as a defect although it is not a support.Should we consider the signal as a defect?

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