12:56 Aug-13-2009 gowrishankar R & D, scientist ISRO, India, Joined Nov 2008 34
UT AND THICKNESS MAPPING
i repeat the question
While constructing DAC we always get a profile ie. metal travel distance to amplitude as a non linear curve. Less metal travel distance gives more equivalent amplitude. Now i got a doubt, in some occations we come across this curve as beam profile diagram apperas like gaussian beam.
can we use such DAC'S? some times i found it while working with TR Probes also.
another doubt is
if we give lead coating for about 3mm thick on aluminum sample of 15mm thick can we assess defects in lead/aluminum like debonds as well as cracks in these individual materials? can we check thickness of aluminum (if some reduction is expected during some more operations like buffing/grinding before lead coating)with this interface with access to aluminum only?
kindly ans these questions