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Technical Discussions
Vikram
NDT Inspector, - Phased Array Specialist
Mistras Group Inc., USA, Joined Jun 2009, 9

Vikram

NDT Inspector, - Phased Array Specialist
Mistras Group Inc.,
USA,
Joined Jun 2009
9
07:31 Jun-29-2009
Phased Array Steering Limits - Calculations

I wonder how the calculation for the beam steering in a phased array transducer goes:

For circular transducers the formula is 0.514 X (Wavelength)/ (Dia. of the transducer). How does that translate to finding the steering limits of a 5MHz, 16 element probe with a pitch of 0.6mm and a smallest possible element size of 0.2mm. The calculations do not make much sense when done but I know there was certain discussions before here about comparing rectangular and circular transducer.

 
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Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
16:44 Jun-29-2009
Re: Phased Array Steering Limits - Calculations
In Reply to Vikram at 07:31 Jun-29-2009 (Opening).

Just a thought -- why not 'ask the transducer'. Try setting up a DAC curve using a 40 to 70 degree sectoral scan ['ducer on a wedge of approx 50 deg]. If it calibrates OK, try 35 to 75 or similar. If it cal's poorly, reduce the span of the scan angle.

My experience with 5L16's [5 MHz Linear 16-element] is that 50 to 70 degrees calibrates fine, 45 to 70 is problematic. Calculations make quite a few assumptions that may or may not hold true in the 'Real World'. Eventually, you will have to calibrate your system with that 'ducer. Why not now?

 
 Reply 
 
Vikram
NDT Inspector, - Phased Array Specialist
Mistras Group Inc., USA, Joined Jun 2009, 9

Vikram

NDT Inspector, - Phased Array Specialist
Mistras Group Inc.,
USA,
Joined Jun 2009
9
20:48 Jun-29-2009
Re: Phased Array Steering Limits - Calculations
In Reply to Roger Duwe at 16:44 Jun-29-2009 .

Funny that you mention it, I just did the calculations for a SDH of 0.0625" to check the beam steering capability for an L-wave. I am going to extend the same for shear wave and get the results.

 
 Reply 
 

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