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- since 1996 -
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Technical Discussions
Raymond Johnson
,
United Kingdom, Joined Aug 2016, 3

Raymond Johnson

,
United Kingdom,
Joined Aug 2016
3
17:37 Aug-11-2016
A-scan test data for matlab users.

Hello everyone. I am new to this area. I was wondering if somebody could pass me a few scans to play with.
In particular, I was looking for a-scans along the lines of Figure 3 and Figure 4 in the following post from the NDT net: http://www.ndt.net/apcndt2001/papers/1162/1162.htm.

Also, it would be great if some experimental condition regarding the data was provided.

I am interested in estimating reflections in multiple-layered object so the location of reflecting layers is critical to the cause. Finally, even better if the data was in Matlab.

 
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Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1300

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1300
20:41 Aug-11-2016
Re: A-scan test data for matlab users.
In Reply to Raymond Johnson at 17:37 Aug-11-2016 (Opening).

Raymond, if you go to a recent forum post I made with a waveform analysis programme:
http://www.ndt.net/forum/thread.php?admin=&forenID=0&msgID=64178&rootID=64178#64178
there you will find 3 txt files as part of the programme so that any interested parties could experiment with a typical data file. Txt format places the time in one column and amplitude in the next adjacent column. The data provided is from a through-transmission setup so it does not have the multiples you pointed to in your referenced paper.

 
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Henry Herrera
R & D,
UT Quality, Canada, Joined Jun 2000, 19

Henry Herrera

R & D,
UT Quality,
Canada,
Joined Jun 2000
19
19:07 Aug-17-2016
Re: A-scan test data for matlab users.
In Reply to Raymond Johnson at 17:37 Aug-11-2016 (Opening).

Raymond, you could generate your own synthetics at least for learning purposes.
I am sharing some Matlab codes that you could use and play with to create you own wavelet and reflectivity functions. This could be useful to simulate layered media or multiple reflectors with different polarities (let's assume that negative polarity is equivalent to phase reversal).
I am also sharing a real TOFD dataset with sample code for deconvolution in the entire dataset or a single A-Scan.
For simplicity I used a for loop, but it works a lot faster using the parallel processing version parfor.

The code generates figures for the paper
- Herrera R.H., Liu Z., Raffa N., Christensen P. & Elvers A. Improving Time Estimation by Blind Deconvolution: with Applications to TOFD and Backscatter Sizing. NDT in Canada 2015, Edmonton, AB, Canada (June 15-17, 2015).
- http://www.ndt.net/events/NDTCanada2015/app/content/Paper/8_Herrera_Rev1.pdf

You can find the Matlab codes and PPT Slides with more information in:
https://www.researchgate.net/publication/277330160_Improving_Time_Estimation_by_Blind_Deconvolution_with_Applications_to_TOFD_and_Backscatter_Sizing


Please feel free to play with the code and let me know if you need further assistance.
Hope this helps.
Henry


 
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