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Technical Discussions
DEBDUTTA MALLIK
Consultant,
Malaysia, Joined Jun 2005, 37

DEBDUTTA MALLIK

Consultant,
Malaysia,
Joined Jun 2005
37
09:25 Nov-02-2006
TCG CURVE

Dear friends,
Please let me know the method to draw a TCG curve in Ultrasonic testing system when there is only one reference reflector. Is there any calculation on the basis of depth of the material,amplitude or the size of reflector.What will be the rate of decreasing in dB upto zero so that I become same sensitive at all depth.Following are the informatiopn for your understanding.
Depth of the material: 74mm
Reference reflector: 1.5mm FBH 15mm depth

Your reply will be very useful for me.


Best Regards,


Debdutta Mallik


    
 
 Reply 
 
Linxiao
Linxiao
08:37 Nov-06-2006
Re: TCG CURVE
Following the link (session 33), you can find several papers on the "2004 ultrasonic benchmark" problem. Their calculations can answer your questions.

good luck!


----------- Start Original Message -----------
: Dear friends,
: Please let me know the method to draw a TCG curve in Ultrasonic testing system when there is only one reference reflector. Is there any calculation on the basis of depth of the material,amplitude or the size of reflector.What will be the rate of decreasing in dB upto zero so that I become same sensitive at all depth.Following are the informatiopn for your understanding.
: Depth of the material: 74mm
: Reference reflector: 1.5mm FBH 15mm depth
: Your reply will be very useful for me.
:
: Best Regards,
:
: Debdutta Mallik
------------ End Original Message ------------




    
 
 Reply 
 
Linxiao
Linxiao
08:37 Nov-06-2006
Re: TCG CURVE
Following the link (session 33), you can find several papers on the "2004 ultrasonic benchmark" problem. Their calculations can answer your questions.

http://www.cnde.iastate.edu/QNDE/2004%20Info/Abstract%20Book.pdf

good luck!


----------- Start Original Message -----------
: Dear friends,
: Please let me know the method to draw a TCG curve in Ultrasonic testing system when there is only one reference reflector. Is there any calculation on the basis of depth of the material,amplitude or the size of reflector.What will be the rate of decreasing in dB upto zero so that I become same sensitive at all depth.Following are the informatiopn for your understanding.
: Depth of the material: 74mm
: Reference reflector: 1.5mm FBH 15mm depth
: Your reply will be very useful for me.
:
: Best Regards,
:
: Debdutta Mallik
------------ End Original Message ------------




    
 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 520

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
520
09:44 Nov-06-2006
Re: TCG CURVE
You cannot construct a curve from one point...

However if you have a very good theoretical understanding of the system it might be possible to calculate a curve (in a way similar to the DGS system.) the single reference then allows a sensitivity alignment.

The risk of this is that if you make any incorrect assumptions the curve wont be valid.

Using three or more reference points is the only reliable experimental approach.

Joe


----------- Start Original Message -----------
: Dear friends,
: Please let me know the method to draw a TCG curve in Ultrasonic testing system when there is only one reference reflector. Is there any calculation on the basis of depth of the material,amplitude or the size of reflector.What will be the rate of decreasing in dB upto zero so that I become same sensitive at all depth.Following are the informatiopn for your understanding.
: Depth of the material: 74mm
: Reference reflector: 1.5mm FBH 15mm depth
: Your reply will be very useful for me.
:
: Best Regards,
:
: Debdutta Mallik
------------ End Original Message ------------




    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1261

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1261
02:03 Nov-07-2006
Re: TCG CURVE
If the probe you are using is circular the equations derived by Prof. I. N. Ermolov may be useful to derive an approximate curve. I provided the solutions in a user friendly form in an NDT.net article a few years ago.
http://www.ndt.net/article/v07n01/ginzel/ginzel.htm

By entering the attenuation as 0dB/mm you will get the uncorrected version of the relative amplitudes of the selected reflector. i.e. this is the approximate effect of just the spherical divergence effects.

Ed


----------- Start Original Message -----------
: You cannot construct a curve from one point...
: However if you have a very good theoretical understanding of the system it might be possible to calculate a curve (in a way similar to the DGS system.) the single reference then allows a sensitivity alignment.
: The risk of this is that if you make any incorrect assumptions the curve wont be valid.
: Using three or more reference points is the only reliable experimental approach.
: Joe
:
: : Dear friends,
: : Please let me know the method to draw a TCG curve in Ultrasonic testing system when there is only one reference reflector. Is there any calculation on the basis of depth of the material,amplitude or the size of reflector.What will be the rate of decreasing in dB upto zero so that I become same sensitive at all depth.Following are the informatiopn for your understanding.
: : Depth of the material: 74mm
: : Reference reflector: 1.5mm FBH 15mm depth
: : Your reply will be very useful for me.
: :
: : Best Regards,
: :
: : Debdutta Mallik
------------ End Original Message ------------




    
 
 Reply 
 
Khurath
SIS, India, Joined Jan 2018, 2

Khurath

SIS,
India,
Joined Jan 2018
2
06:25 Mar-14-2019
Re: TCG CURVE
In Reply to Joe Buckley at 09:44 Nov-06-2006 .

Thanks for this information of sensitivity calibration and for above 74mm thickness what should be our material debt for calibration

    
 
 Reply 
 

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