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Technical Discussions
Carlos A. Galán
NDT Inspector,
UIS - Universidad Industrial de Santander, Colombia, Joined Oct 2014, 33

Carlos A. Galán

NDT Inspector,
UIS - Universidad Industrial de Santander,
Colombia,
Joined Oct 2014
33
03:08 Nov-27-2019
panametrics videoscan tranducers

Hello everyone,

the parametrics shear wave transducer shown in photo works in pulse-echo mode or transmission through

thanks

 
 Reply 
 
Carlos A. Galán
NDT Inspector,
UIS - Universidad Industrial de Santander, Colombia, Joined Oct 2014, 33

Carlos A. Galán

NDT Inspector,
UIS - Universidad Industrial de Santander,
Colombia,
Joined Oct 2014
33
03:16 Nov-27-2019
Re: panametrics videoscan tranducers
In Reply to Carlos A. Galán at 03:08 Nov-27-2019 (Opening).

Download transducer

https://www.olympus-ims.com/en/ultrasonic-transducers/shear-wave/

 
 Reply 
 
Paul
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 255

Paul

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
255
19:41 Nov-27-2019
Re: panametrics videoscan tranducers
In Reply to Carlos A. Galán at 03:16 Nov-27-2019 .

Hi Carlos,

It's just a transducer, it does whatever you hook it up for. It vibrates and you can choose to catch the echo with the same transducer, or plug in another one and do through transmission. The world is your oyster!

-P

1
 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1307
21:21 Nov-27-2019
Re: panametrics videoscan tranducers
In Reply to Carlos A. Galán at 03:16 Nov-27-2019 .

Carlos, you have already asked about this probe in March of this year (https://www.ndt.net/forum/thread.php?admin=&forenID=0&msgID=74401&rootID=74324#74401)
As Paul noted, it can be used as any probe; but I told you in March that it was probably useful for some civil engineering applications. I suggested you need to use honey as a couplant and Anmol Birring recommended boiled (thick) molasses.
Since it is a normal incidence shear wave probe you will not likely be using on to generate angled beams.

1
 
 Reply 
 
Carlos Andrés Galán
NDT Inspector,
UIS - Universidad Industrial de Santander, Colombia, Joined Oct 2014, 33

Carlos Andrés Galán

NDT Inspector,
UIS - Universidad Industrial de Santander,
Colombia,
Joined Oct 2014
33
03:38 Nov-28-2019
Re: panametrics videoscan tranducers
In Reply to Edward Ginzel at 21:21 Nov-27-2019 .

Hi Edward

I used transverse olympus wave couplant and I tried in omniscan and krautkramer usm equipment in pulse-echo mode for different thicknesses and lengths of shafts in steel and concrete cylinders and
I don't get a signal in any way, I've tried two equal transducers, I don't know what I'm doing wrong.

On an shaft of 2 inches in diameter and 19 cm long in AISI/SAE 1020 steel I reach for a minimum echo but it is almost confused with noise!


Thanks

 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1307
13:10 Nov-28-2019
Re: panametrics videoscan tranducers
In Reply to Carlos Andrés Galán at 03:38 Nov-28-2019 .

Carlos, perhaps it is the instrument that is not adequate. Most of our ultrasonic instruments are intended for weld inspections or simple corrosion tests in steel or aluminium. They are made with a pulser that is tuneable and a receiver bandwidth only for probes between about 1MHz and 10MHz.
If you tried this probe on an Omniscan or USM it would not provide a good transfer of the pulse to the element nor would there be much frequency component in the 1-10MHz region that the instrument is designed for.
It is possible to build a basic low frequency system with a signal generator and suitable receiver amplifiers.

1
 
 Reply 
 
John Norman
Consultant, owner of business
NTS Ultrasonics Pty Ltd, Australia, Joined Oct 2012, 119

John Norman

Consultant, owner of business
NTS Ultrasonics Pty Ltd,
Australia,
Joined Oct 2012
119
01:36 Nov-29-2019
Re: panametrics videoscan tranducers
In Reply to Carlos Andrés Galán at 03:38 Nov-28-2019 .

Hi Carlos.

Ed is correct in that most common UT equipment will not work well at 0.25 MHz, which is the operating frequency of your transducer. You will be at the lower limit or outside of the UT set bandwidth. In my experience, you also get a lower echo amplitude from a shear wave probe, even with an appropriate couplant. Add these two effects together and you would not expect to get a strong response from the transducer using a conventional UT set.
What can you do? You could try different equipment with a suitable frequency response. In my case, I always used in-house designed and built instruments for lower frequency work, but this option may not be available to you.
A trick that some UT techs used to use many years ago, was to place a low value inductor in parallel or series with the transducer they were using to try and "peak" the response. It involves a bit of trial and error. I do not suggest you open up a modern UT set and start soldering in inductors. This is a very bad idea and you would void your warranty. However, you can purchase small component boxes that connect into coaxial cable, and you can experiment with the inductors using one of these. It might help. Inductors with low uH values are what seemed to work in the past.
John Norman

 
 Reply 
 
ultraman
ultraman
10:43 Dec-11-2019
Re: panametrics videoscan tranducers
In Reply to Carlos Andrés Galán at 03:38 Nov-28-2019 .

As for the shear incidence transducer, The reason why you could not get a signal may be;

1. As someone formerly indicated, there is a possibility the pulse voltage of the instrument is
not enough to accellerate the probe, since it is low frequency.

2. If your test material is concrete, stone or rock sample, usually it is not possible to get backwall
echo with one probe. In that case through-mode should be used with a pair of probe.
Furthermore, if the test sample is thick, no signal may be expected.

I have listed "ultrasonic incident longitidinal wave & shear incidence wave....." in You-Tube.
https://www.youtube.com/watch?v=EvLjwA5lBws

I hope it will help you to understand "shear incidence wave" a little.

ultraman

 
 Reply 
 

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