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Technical Discussions
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
15:37 Jan-03-2020
the confuse with digital imaging for PAUT

hello!during PAUT inspection, if a scan is 1000mm long with a sample taken every 1mm, and the data will show on the screen with 500 pixel in horizontal direction. then each pixel will represent 2mm. my confusion is : which date acqusition will be hided, the first 1mm or the second 1mm?
thanks

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 785

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
785
16:47 Jan-03-2020
Re: the confuse with digital imaging for PAUT
In Reply to langtuteng2 at 15:37 Jan-03-2020 (Opening).

Just touch surface while scanning during odd and even scans to find out

 
 Reply 
 
Levi Porter
R & D,
Dacon Inspection Technologies, Thailand, Joined Jan 2017, 50

Levi Porter

R & D,
Dacon Inspection Technologies,
Thailand,
Joined Jan 2017
50
01:39 Jan-04-2020
Re: the confuse with digital imaging for PAUT
In Reply to langtuteng2 at 15:37 Jan-03-2020 (Opening).

Hi Langtuteng2,
Great question!

How B and C scan data are displayed depends on the software written for the PAUT instrument you are using. Every instrument is a bit different, for instance the B/C scans are scrolling types on some instruments to keep every sample displayed while scanning, and some instruments leave some out based on amplitude. This can get especially sensitive when using Olympus OMNI equipment, as very long scan may have missed acquisition (black lines in data) which will not be dispayed. One work around is to split your 1000mm scan into multiple scans. Other instruments like the M2M Gekko have a feature to indicate when an acquisition point has been missed.

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
05:28 Jan-04-2020
Re: the confuse with digital imaging for PAUT
In Reply to Levi Porter at 01:39 Jan-04-2020 .

thanks, Levi Porter
if we split 1000mm scan into multiple scans, we have to spend much more time in inspecting and decrease efficiency. normally, we often scan 1000mm one time.
Now, I don't know which pixel will be assign to indicate the date if every two pixels will represent 1mm scan and the increment is 1mm, because if more pixels represent the indication, the more attention will be drawn by PAUT data evaluator.

 
 Reply 
 
Ali
NDT Inspector,
Iran, Joined Mar 2013, 109

Ali

NDT Inspector,
Iran,
Joined Mar 2013
109
14:06 Jan-04-2020
Re: the confuse with digital imaging for PAUT
In Reply to langtuteng2 at 05:28 Jan-04-2020 .

Which instrument you are using?what is the PAUT machine software version?

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 196

langtuteng2

Armenia,
Joined Nov 2014
196
15:56 Jan-04-2020
Re: the confuse with digital imaging for PAUT
In Reply to Ali at 14:06 Jan-04-2020 .

hello, the software is Olympus-OmniPC -4.4R5

 
 Reply 
 
Daniel Braun
Daniel Braun
16:01 Jan-04-2020
Re: the confuse with digital imaging for PAUT
In Reply to langtuteng2 at 15:37 Jan-03-2020 (Opening).

Normally the instruments should process and store the ultrasonic data and form image out of them and the scrolling is provided for the C-Scan (Top View) / B-Scan (Side View) / Strip Chart, etc captured along the scanning line if the scanning length exceeds the screen limit, refer for example to:

https://youtu.be/AKwC2Xp6gyo - scanning of longitudinal seam - forming of Top and Side Views

https://youtu.be/F1O53GU14QM - scanning of butt welds with a pair of PA probes - forming a strip chart

https://youtu.be/RTxKuWtO2fE?t=364 - scanning of HDPE weld with forming of strip chart

https://www.youtube.com/watch?v=v0hlEhJM_d4&feature=youtu.be&t=137 - scanning of the critical zone of the annular ring - forming of Top and Side Views

At the postprocessing stage the images have been formed out of stored data ultrasonic data and of course the user may toggle between the

(A) compressed image providing observation of whole scanned length on one screen

OR

(B) stretched image allowing the scrolling

For the compressed image (Case A) several readings will overlap in the same “pixel” - in such case:

A1 for the amplitude map the color corresponding to the highest amplitude dominates

A2 or the corrosion (thickness) map the color corresponding to the minimal remaining thickness / maximal thickness loss dominates

But in any case the data is stored completely and the precise boxing of the indications on the map is achievable independently on selected imaging option either A or B especially if utilizing the automatic defect detection / sizing / alarming / listing function, refer for example to:

https://www.ndt.net/search/docs.php3?id=22510

and

https://youtu.be/DI33lzGcwLo

 
 Reply 
 
Ali
NDT Inspector,
Iran, Joined Mar 2013, 109

Ali

NDT Inspector,
Iran,
Joined Mar 2013
109
22:23 Jan-04-2020
Re: the confuse with digital imaging for PAUT
In Reply to langtuteng2 at 15:56 Jan-04-2020 .

On the top panel of Omni pc software, there is the scan box that display scan distance per mm and is linked to data blue courser on C or B scan . you can also type any distance in the scan box to put the blue data curser on the area as you wish(1,2mm,...) on C-Scan .if you have large data on C-scan,you can drag zooming box on C-scan to get more resolution .
to avoid missing line on Omni scan mx2 ver 4.4 , before start to scan you should drag zooming box on C-scan veiw( touch the start point of C-scan by your finger and drag it),then data will scroll during scan and you will see any missed line online .
To reduce number of the scan files for long welds ,you can increase scan length 6 up to 10 Meters ,depends on scan plan ,file size ,ability of your PAUT machine , PC for analysis of large data files, accurate calibration of encoder, and you should apply zooming box on small area of C-scan before start the scan

 
 Reply 
 

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