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Re: Near field operation - a further discussion

Posted by: Rolf D. , E-mail: rd@ultrasonic.de, on September 05, 1996 at 21:04:54:

In Reply to: Re: Near field operation by use of Hardface probes posted by : Splitt on September 05, 1996 at 10:42:45:

Hello Mr. Splitt,
Hello Workshop participants,

thanks for your answer, however I have still some more questions
regarding the near field operation.

You said
"With a broad band probe the maxima and minima are
smoothed out", what will be the dB figure approximately?

Further you said
"...you will detect a small reflector two or more times
when you scan the probe transverse to the flaw position."

That actually means that the sound pressure curve isn't so
much smoothed out as you said it before. Or is there just a minima at the
beam axis?


I remember while adjusting a probe on a pipe I received
at two positions a maxima echo amplitude, if
entry echo or backwall echo I don't remember.
My question is:
In what position should the probe be adjusted?
If I use a maxima the probe will not stand in the 'correct' angle to the
pipe axis. The application is a wall thickness measurement
as well as a flaw detection.

Rolf Diederichs

By the way, here a hint for the Germans.
Mein Englisch ist auch nicht vom Besten, ohne ein
Spell check program für meine englischen Texte wäre ich aufgeschmissen
Sehr gut eignet sich der Spell Anywhere von GIR software.
Ich hatte ihn früher mal über CompuServ geladen. Dieses
oder ähnliches ist aber sicherlich auch im Internet zu beziehen.


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