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- since 1996 -
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Technical Discussions
S KUNDU
S KUNDU
12:50 Oct-12-2015
EFFECTIVE HEIGHT OF PHASED PARRAY PROBE

Dear all ,

Please some one help me to understand that what is EFFECTIVE HEIGHT OF PHASED ARRAY PROBE.
(as per ASME SEC V Table V-421.)

Example: no of element-16
1st ele. h -- 11.2mm
wedge ang-- 36deg
pitch -- 0.6mm

    
 
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Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 189

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
189
23:01 Oct-12-2015
Re: EFFECTIVE HEIGHT OF PHASED PARRAY PROBE
In Reply to S KUNDU at 12:50 Oct-12-2015 (Opening).

# elements * pitch
16 x 0.6 = 9.6 mm

Pitch = element width + gap in between each one

    
 
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S KUNDU
S KUNDU
13:06 Oct-20-2015
Re: EFFECTIVE HEIGHT OF PHASED PARRAY PROBE
In Reply to Paul Holloway at 23:01 Oct-12-2015 .

so effective Aperture and effective height is same ?

1    
 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 189

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
189
21:58 Oct-20-2015
Re: EFFECTIVE HEIGHT OF PHASED PARRAY PROBE
In Reply to S KUNDU at 13:06 Oct-20-2015 .

Usually "aperture" is measured in the active direction and height is measured in the passive direction:

Imagine a 16 element probe, with a pitch of 0.6mm. With elements arranged like this:

||||||||||||||||

If you fired all 16 elements, the aperture would be 16 x 0.6 = 9.6mm (left to right dimension), and the height would be the height of each element (vertical dimension). Unfortunately, my ASCII graphics abilities have dwindled since the heyday of the 80's. You'll have to use your imagination that the above illustration is to scale.

1    
 
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Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 746

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
746
23:27 Oct-20-2015
Re: EFFECTIVE HEIGHT OF PHASED PARRAY PROBE
In Reply to S KUNDU at 13:06 Oct-20-2015 .

Usually height is the length of each crystal but ASME V, Art 4, Table V-421 defines height as the active aperture.

1    
 
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Massimo Carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

Massimo Carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
19:21 Nov-07-2015
Re: EFFECTIVE HEIGHT OF PHASED PARRAY PROBE
In Reply to Paul Holloway at 21:58 Oct-20-2015 .

It does not change a life, but the exact calculation for virtual aperture of a PA configuration is:
(Active elements-1)*pitch+e (element width). As an example, virtual aperture for 16 elements pitch 0,5 element size "e" 0,4 mm is:
15*0.6+0.4=9.4mm.
Please notice that "e" value is an essential variable according to ASME, but this value is not written in the PA probes data sheet (at least the old ones).

    
 
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