where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
920 views
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.

    
 
 Reply 
 
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 
 

Product Spotlight

AIS229 - Multipurpose Real Time System

Latest standard & automatic real time system developed by Balteau. The AIS229 has been designed to
...
do series inspection in a wide variety of industry. Composed of a shielded cabinet, 5 axis manipulator, x-ray generator and tubehead from 160kV to 225kV, a fl at panel & much more, the AIS229 is most certainly one of the most multipurpose RTR system available on the market.
>

MUSE Mobile Ultrasonic Equipment

The MUSE, a portable ultrasonic imaging system, was developed for in-field inspections of light-weig
...
ht structures. The MUSE consists of a motor-driven manipulator, a water circulation system for the acoustic coupling and a portable ultrasonic flaw detector (USPC 3010). The MUSE provides images of internal defects (A-, B-,C- and D-scan).
>

ISONIC 3510

Very Powerful Superior Performance Extremely Portable Smart Phased Array Ultrasonic Flaw Detector an
...
d Recorder with 2 Conventional UT and TOFD Channels uniquely combines PA, single- and multi-channel conventional UT, and TOFD modalities providing 100% raw data recording and imaging. Suitable for all kinds of every-day ultrasonic inspections
>

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window