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Is PVDF for achiving high resolution the best choice? (for thin plastic layers)
Posted by: Rolf Diederichs , E-mail: rd@ultrasonic.de, on September 04, 1996 at 17:04:40:
In R. A. Day's article it is pointed out:
"The bandwidth of PVDF is actually the best of any material so far discovered and
routinely produces transducers with 0.5 to 1 cycle
transmitted and received pulses".
Is it right that there is no doubt about that PVDF should be used for
gaining the best resolution. Especially for excellent near to surface resolution
or thin wall thickness measurement it should be applied.
Just in a case we would need maximal amplitude as well, we
should consider also other transducer materials.
Finding a solution for a very thin wall thickness measurement is always a challenge.
Here is an example I assume that a PVDF transducer should be used.
What would be the best transducer design (Dia, Freq, Focus) for the application of
Coextrusion Layer Thickness Measurement
for polyamid gasoline pipes.
Especially for an In-Line measurement by immersion technique,
however to measure also the thickness of some layers.
Product dimensions:
Dia: about 8mm
Total wall: about 1mm
1-5 Layers: each in a range of 0.1mm - 0.3mm
I am locking forward your suggestion.
Rolf Diederichs
(Image reference: Echo Image Examples)
Coextrusion Layer Thickness Measurement