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Hillger NDT GmbH
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Technical Discussions
Zahra
Zahra
07:38 Jul-21-2004
phased Array transducer applications?

i am interested in getting some information regarding the application of phased array transducers in NDT; more specifically the type of the materials that can be inspected by this group of transducers, the maximum depth of penetration and thickness measurement, the improvement of SNR by these systems and...

i appreciate any information in advance


 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1285

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1285
03:00 Jul-22-2004
Re: phased Array transducer applications?
Zahra:
Phased array probes can be used essentially just as if it was a regular single element unit...but far more adaptable to applications. Selecting a large annular array you can extend a beam to great depth and also maintain good resolution near the test surface.
Using a matrix array you can achive beam steering.
Signal to noise ratio is generally better for PA probes compared to single element because for the same voltage applied the constructive interference that builds the phased wavefront results in twice the amplitude particle displacement.
You must still contend with the normal limitations that ultrasound is subject to with regards to scatter and attenuation.

Ed
----------- Start Original Message -----------
: i am interested in getting some information regarding the application of phased array transducers in NDT; more specifically the type of the materials that can be inspected by this group of transducers, the maximum depth of penetration and thickness measurement, the improvement of SNR by these systems and...
: i appreciate any information in advance
------------ End Original Message ------------




 
 Reply 
 
Wolfgang Bisle
Wolfgang Bisle
09:11 Aug-03-2004
Re: phased Array transducer applications?
There is a simple solution for your question:
Look to the sites of manufacturers of array testing equipment.

A nice selection of application reports you will find on RD-Tech's homepage http://www.rd-tech.com/
But also GE-IT (US, including Krautkramer), Technology Design (UK),Multi 2000 (M2M, France), Harfang (Can) show applications...

The portable units like the Omniscan will change the field of application to nearly everywhere. Not everwhere you need the phased array , sometimes the array configuration already is suitable. But having both makes inspection easy.

Think of new materials like Fiber Metall Laminates, composites, but also monolithic metallic structures like rails, landing gears, and especially to contral joinings like electron beam welds, laser beam welds, friction stir welds ....

Just in aeronautics the array inspection technology will soon be the standard. Outrunning sometimes so high sophisticated technologies like thermography and shearography because of small equipment, easy and conventional (UT) training of personal (you need no new certificate)...and lot of other advantages.

so everywhere you can use single element UT also Array UT is possible and you will earn a lot of móre clarity while inspecting complex structures.


 
 Reply 
 
adewale
adewale
02:12 Sep-24-2004
transducers andits place in instrumentation,control and automation
------t-- Start Original Message :
hi zahra, ijust want to know more about the place of transducers in measurement control and automation.i'm an electrical engineering student.
hope to hear from you soon.


 
 Reply 
 

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