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Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.

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Technical Discussions
T. Stepinski
R & D
Uppsala University, Sweden, Joined Nov 1998, 14

T. Stepinski

R & D
Uppsala University,
Sweden,
Joined Nov 1998
14
01:57 Dec-05-1999
transducer calibration

Periodic calibration of ultrasonic transducers has become an important issue for inspection companies in Sweden.
Does anybody know any commercial equipment for this purpose?


    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
05:24 Dec-06-1999
Re: transducer calibration

: Periodic calibration of ultrasonic transducers has become an important issue for inspection companies in Sweden.
: Does anybody know any commercial equipment for this purpose?

I don't think that it is a question of specific equipment so much as a matter of your test procedure and appropriate calibration control of your test equipment. We qualify transducer performance here using test blocks, pulser/receivers and signal analyzers whose calibration is traceable to a national standard and verified periodically. You could use any reasonable combination of instrumentation and reference standards to gage the performance of a specific transducer. As long as the calibration of your test equipment is documented and controlled, you should be able to reliably track transducer performance over time.

Panametrics and many other transducer manufacturers will retest used transducers under such controlled conditions for a reasonable fee.

--Tom Nelligan


    
 
 
Rolf Diederichs
Director,
NDT.net, Germany, Joined Nov 1998, 604

Rolf Diederichs

Director,
NDT.net,
Germany,
Joined Nov 1998
604
09:12 Dec-06-1999
Re: transducer calibration
: Periodic calibration of ultrasonic transducers has become an important issue for inspection companies in Sweden.
: Does anybody know any commercial equipment for this purpose?
-------------

There was a paper at the ECNDT'98 about Periodical Verification,
however, not about transducers.

H. Walaszek - CETIM, France.
Periodical Verification of Ultrasonic Flaw Detectors
According to European Standardization.

Abstract (http://www.ndt.net/abstract/ecndt98/461.htm)

This paper at first briefly describes the present state of European standards projects elaborated by working group 2 of
138 technical comitee (EN TC 138 - WG2) and concerning the verification of ultrasonic equipment used in non
destructive testing. The paper higligthts the consequences of this standard projects when it is adopted (forseen in 1998)
on the verification of ultrasonic flaw detectors which periodicity will be at least once e year.

Finally, is given an example of application of standard project, through the description of a prototype of partly automated
system developped by CETIM and enabling verifications in conformity with European standards.

This paper is illustred by an example of performing verification of one of the characteristic parameters of a flaw detector.


    
 
 

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