where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

3444 views
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


    
 
 
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 ------------




    
 
 
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 ------------




    
 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 519

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
519
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 ------------




    
 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1252

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1252
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 ------------




    
 
 
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

    
 
 

Product Spotlight

I&T Nardoni

NDT, RESEARCH AND DEVELOPMENT OF NEW METHODOLOGY, TRAINING CENTER I&T NARDON INSTITUTE was idiated
...
in 1988 by Giuseppe Nardoni, now president and owner of the company, based on his multi-annual and international experience in the field of NDT.
>

High Resolution Industrial CT System for Small/Medium Size Parts Inspection

The YXLON FF35 CT computed tomography system is designed to achieve extremely precise inspection res
...
ults for a wide range of applications. Available in a single or dual tube configuration, it is perfect for very small to medium size parts inspection in the automotive, electronics, aviation, and material science industries.
>

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

TOPAZ® 64: Fully Integrated Portable 64 Channel PAUT Instrument with FMC & TFM

Introducing TOPAZ64, the industry’s most intelligent fully integrated, portable 64-channel phased
...
array ultrasound (UT) instrument. TOPAZ64 combines code-compliant phased array UT with the industry’s most advanced full matrix capture (FMC) and total focusing method (TFM) capabilities. Featuring the highest acquisition frequency in its class, high resolution FMC and a 12” multi-touchscreen, users can easily visualize even the smallest flaws. TOPAZ64 can generate a bipolar pulse that provides more acoustic energy versus previous models for punching through thick components. The result is a portable tool that delivers increased inspection coverage, more accurate signals, and the ability to handle all UT inspections in one package. TOPAZ64 is ideal for challenging applications in transportation, oil and gas, manufacturing and power generation.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window