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- since 1996 -

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Technical Discussions
Mikel
Teacher,
GOIERRI SCHOOL, Spain, Joined Dec 2013, 6

Mikel

Teacher,
GOIERRI SCHOOL,
Spain,
Joined Dec 2013
6
00:38 Dec-18-2013
interpretation phased array image

This image corresponds to a phased array inspected weld (136mm thickness).
What interpretation can be done?

https://dl.dropboxusercontent.com/u/88274602/phased%20array%20image.jpg

Thanks!!

    
 
 
Swadesh Singh
Saudi Arabia, Joined May 2012, 60

Swadesh Singh

Saudi Arabia,
Joined May 2012
60
05:34 Dec-18-2013
Re: interpretation phased array image
In Reply to Mikel at 00:38 Dec-18-2013 (Opening).

Hi Mikel,

There may be many reasons such as electrical noise, transducer damage, higher PRF. Check on each suspected factors.

    
 
 
Ali Chaboki
Engineering, NDT, Welding
TUV NORD, Iran, Joined May 2013, 32

Ali Chaboki

Engineering, NDT, Welding
TUV NORD,
Iran,
Joined May 2013
32
10:57 Dec-18-2013
Re: interpretation phased array image
In Reply to Mikel at 00:38 Dec-18-2013 (Opening).

Hi Mikel
Its your encoder connection which is responsible for that noise. Try to fix it and I am wishful to hear about the result.

Ali

    
 
 
Swadesh Singh
Saudi Arabia, Joined May 2012, 60

Swadesh Singh

Saudi Arabia,
Joined May 2012
60
15:00 Dec-18-2013
Re: interpretation phased array image
In Reply to Ali Chaboki at 10:57 Dec-18-2013 .

Hi Ali,

I am eager to know that how an encoder connection be responsible for noise?. It would be appreciable, if you elaborate on this.

Thanks

    
 
 
Mikel
Teacher,
GOIERRI SCHOOL, Spain, Joined Dec 2013, 6

Mikel

Teacher,
GOIERRI SCHOOL,
Spain,
Joined Dec 2013
6
11:01 Dec-19-2013
Re: interpretation phased array image
In Reply to Swadesh Singh at 15:00 Dec-18-2013 .

Me too!!!!!

    
 
 
wieslaw bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 248

wieslaw bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
248
18:49 Dec-19-2013
Re: interpretation phased array image
In Reply to Swadesh Singh at 15:00 Dec-18-2013 .

It is quite popular, that encoder is generating significant electrical noise We have made many times this experience in different industrila and laboratory systems and have also helped our customers to fix it.

In some cases changing the connection cable helps, sometimes filtering (not always good for ecoder signal), sometimes you must find better encoder.

    
 
 
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
01:40 Dec-20-2013
Re: interpretation phased array image
In Reply to wieslaw bicz at 18:49 Dec-19-2013 .

This is an s-scan, so there is no implied movement. I do not see
how an encoder could be responsible. It's hard to say what is responsible
for the observed noise. I would start by reducing the PRF and see if that helps

Joe

1    
 
 
Ali Chaboki
Engineering, NDT, Welding
TUV NORD, Iran, Joined May 2013, 32

Ali Chaboki

Engineering, NDT, Welding
TUV NORD,
Iran,
Joined May 2013
32
16:34 Dec-20-2013
Re: interpretation phased array image
In Reply to Joe Buckley at 01:40 Dec-20-2013 .

Dear Joe

I saw this problem twice:
Once, I was working on weld inspection and I devised a way to eliminate the encoder setting time by just unplugging the encoder connection and adjusting the traveled path to zero on an AGR Handyscan RX device. That helps, but I figured out that in some instances there was some interfering signals on screen and even they were evident on the stored file while browsing on scan files. that makes me to investigate on the reason and I clearly found it out that defective plugging of encoder is the main cause and I never tried it again:-).
The second time that I saw that was on an Omniscan MX2 device using the same type of encoder but with an additional encoder adapter. the same noise was evident then and the most simple ways to fix it was to replug the cable at adapter connection or just to tap on it.

Ali

    
 
 
Ali Chaboki
Engineering, NDT, Welding
TUV NORD, Iran, Joined May 2013, 32

Ali Chaboki

Engineering, NDT, Welding
TUV NORD,
Iran,
Joined May 2013
32
17:36 Dec-20-2013
Re: interpretation phased array image
In Reply to Swadesh Singh at 15:00 Dec-18-2013 .

Dear Swadesh
To be frank, I find it out practically and I have no reasonable description for this phenomenon.

    
 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1254

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1254
19:22 Dec-20-2013
Re: interpretation phased array image
In Reply to Joe Buckley at 01:40 Dec-20-2013 .

I think Joe has made a good observation. All we see is what appears to be electrical noise on the timebase of SOME of the upper angles on a single S-scan. A single S-scan is not adequate to make a specific identification of a noise source. It has many sources; RF pick-up, faulty grounding, welders or grinders working on the component, as well as position encoders. The place to identify (and resolve) the source of electrical noise is on the work-site, not by musing over a single S-scan long after the data was collected. Trying to isolate the source of noise can be a time-consuming process of elimination of the many options. An interesting source of noise on a project was moisture in the probe-connector box. When the scanner was upside down water contacted the connections and cause noise. When the scanner moved up to the sides or top of the weld, the water moved away from the contacts and no noise!

1    
 
 
Ali
NDT Inspector,
Iran, Joined Mar 2013, 93

Ali

NDT Inspector,
Iran,
Joined Mar 2013
93
07:48 Dec-21-2013
Re: interpretation phased array image
In Reply to Mikel at 00:38 Dec-18-2013 (Opening).

Mikel
Also check the splitter and charger connection if you are using.
If the probe frequency is 5 MHz it is better to switch to 2 or 2.5 MHz probe to get more penetration and lower gain for TCG for 136 mm thickness.

    
 
 
Ilke Savas Uzun
Ilke Savas Uzun
06:28 Dec-24-2013
Re: interpretation phased array image
In Reply to Mikel at 00:38 Dec-18-2013 (Opening).

Practical solution: I can stick playdoo or chewing gum top end section of the probe and wedge assembly and reduce the prf a little bit..
Merry Christmas

    
 
 

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