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Re: Smallest detectable flaw size, especially for low frequency test (f= 0.5 MHz) and in general.

Posted by: Rolf D. , E-mail: rd@ultrasonic.de, on September 12, 1996 at 10:24:22:

In Reply to: Re: Smallest detectable flaw size, especially for low frequency test (f= 0.5 MHz) and in general. posted by : Robert A. Day on September 11, 1996 at 23:37:40:

Rocky,

thanks for your answer with so much details.

With the attached picture I want to make
my questions more clear.

Rocky explained a very complicate subject,
I didn't wanted to release a so detailed discussion.
However If you like you could continue and try to keep
the general aspect on sound propagation for this workshop theme.
Further I could past this messages to a future workshop
on flaw detection, this could be a valuable start.

Besides the air coupling capability I wanted to get a more
detailed information about the smallest flaw size
for a simple shaped defect (FBH). Especially the area where the
curve starts to drop and further how the curve continue.

I can imagine that the curve drops within x dB per wavelength.
What will be x?

I remember from my time I did really ultrasonic (no virtual like now)
that we recognized conclusions in plastic pipes mostly in a range
of 1/2 to 1 wavelength, so this confirms what Bill stated.
Refer also to the attached article where transducer selection
for a given task is discussed.

Thanks again for your discussion.

Rolf


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