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- since 1996 -
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Technical Discussions
John
John
05:25 Feb-26-2007
how phase array technology avoid the interference between elements?

each element generate a wavelet, when the wavelet meet a flaw,reflected wave occured.my question is:the reflected signal will aslo received by other elements,but actually this not happened,how phase array technology avoid the interference between elements?


    
 
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Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 522

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
522
06:29 Feb-26-2007
Re: how phase array technology avoid the interference between elements?
This does happen, it is a key part of the science by which PA works.

Joe

----------- Start Original Message -----------
: each element generate a wavelet, when the wavelet meet a flaw,reflected wave occured.my question is:the reflected signal will aslo received by other elements,but actually this not happened,how phase array technology avoid the interference between elements?
------------ End Original Message ------------




    
 
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Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
09:52 Feb-26-2007
Re: how phase array technology avoid the interference between elements?
You will find a brief explanation in the "How do they work?" section of this paper from our web site.


    
 
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Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
00:20 Feb-27-2007
Re: how phase array technology avoid the interference between elements?
Yunxi:
The "interference" in phased array probes is the principle by which they work. You can see some images of phase constructed pulses on the pdf file at http://www.ndt.net/article/wcndt2004/html/htmltxt/127_ginzel.htm
The transmitted pulses are illustrated there and you see that the wavelets are used to construct a main pulse that has effectively the same characteristics as a single element pulse. It is NOT the individual wavelets that we deal with when using the pulse generated from a phased array probe!! They form a wavefront that is used in that same way that single element UT was used.

The receive function of the phased array probe is similar. The individual elements on a linear array each receive a portion of the pressure of the reflected pulse. The voltages they form to are sent to individual amplifiers to account for timing differences and then this is sent to a summation amplifier. An simplified diagram of the electronics is seen in a paper by Dr. Wüstenberg http://www.ndt.net/article/v04n04/wuesten/wuesten.htm


Regards
Ed

----------- Start Original Message -----------
: This does happen, it is a key part of the science by which PA works.
: Joe
: : each element generate a wavelet, when the wavelet meet a flaw,reflected wave occured.my question is:the reflected signal will aslo received by other elements,but actually this not happened,how phase array technology avoid the interference between elements?
------------ End Original Message ------------




    
 
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