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Technical Discussions
langtuteng
Armenia, Joined Nov 2014, 147

langtuteng

Armenia,
Joined Nov 2014
147
04:08 Feb-07-2019
ISO18563-3 Relative sensitivity of virtual probes

hi! could anybody know the item 9.6.2, "If the instrument has the capability, the normalization of virtual probes should be performed", how to understand the normalization? or how should i do to carry on this procedure? thanks in advance

    
 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 172

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
172
23:07 Feb-21-2019
Re: ISO18563-3 Relative sensitivity of virtual probes
In Reply to langtuteng at 04:08 Feb-07-2019 (Opening).

It might be easiest to think about an electronic scan at some desired angle where you are stepping across the available elements in your probe in groups (virtual probe apertures, or VPA's). In Olympus software, for example, you would go to Wizard -> Calibration -> Sensitivity to set all VPA's to roughly the same sensitivity. For normal incidence you could use a parallel backwall, or for other angles you would likely choose a side-drilled hole that you observe across all VPA's.

I've been dwelling on the same topic, but a different standard lately - ASTM E2491. This document instructs the operator to observe the relative sensitivity of each element against a +/-2dB criteria. After a quick read it wasn't clear if this judgement was to be made prior to normalization of the VPA's (I think that ISO 18563-3 would call this "absolute sensitivity of virtual probes"), or after normalization (I think that ISO 18563-3 would call this "relative sensitivity of virtual probes"). The latter seems likely, given that the +/-2dB criteria would be common between the documents then.

Regards

    
 
 

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