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Posted on Tue Sep 09, 2008 05:15 PM
Post Subject: Multi-scan % loss
Does anyone know's how much do I lose of at the same time i have a PA pulser and some UT convencionals at the same time (or TOFD), for example with a 15 cm/s speed do I lose anything?
Tanks
Yes, the more you add on to your scanning, the slower your scanning will be. Normally, the rate limiting factor in scanning is data transfer rate (there are other possible limitations, e.g. UT wraparound and mechanics, but these don't sound like the issue). The addition of TOFD is not likely to slow you down much as it is a single B-scan. The conventionals don't slow you down much either as they are one A-scan each; what really limits you will be the PA as this has many beams. To get the fastest scan, you may need to optimize your PA, which means not necessarily stepping every element on E-scans for example, or not necessarily stepping at one degree increments for S-scans. Typically, you need to ensure that you are getting 50% coverage (6 dB drop-off) using either scan.