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Face plate thickness

Posted by: Stevie Jones , E-mail: Steve.Jones@btinternet.com, on October 01, 1996 at 17:33:02:

Hello.
Sorry to come late, could I maybe sneak another
question in?
We all know that the best face plate for a transducer
is 1/4 wave thick and its impedance is the mean (either
arithmetic or geometric, depends on the paper) of the
transducer and target impedances.

My question is, what about when either you don't know
what the impedance of the target is, or you cannot
control the impedance of the face that well? Both
apply to soft-faced contact NDT probes. How thick
should the faceplate be then?

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Follow Ups:

• Re: Face plate thickness Robert A. Day 12:36:25 10/04/96 (size: 2098) (1)
  • Re: Face plate thickness Steve Jones 15:01:44 10/04/96 (size: 814) (0)

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Comments:
: Hello. : Sorry to come late, could I maybe sneak another : question in? : We all know that the best face plate for a transducer : is 1/4 wave thick and its impedance is the mean (either : arithmetic or geometric, depends on the paper) of the : transducer and target impedances. : My question is, what about when either you don't know : what the impedance of the target is, or you cannot : control the impedance of the face that well? Both : apply to soft-faced contact NDT probes. How thick : should the faceplate be then?

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