NDT Solution
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Effect of Ultrasonic Beam Frequency and
Focalization on Detectability and
Resolution of Minute Discontinuities
Figure 1-3
Figure 1 - The radio frequency signal displayed on the oscilloscope screen: (a) echo waveform from the 100 µm (3.9 x 10-3 in.) aluminum flat bottom hole 100-3, amplified; (b) echo waveforms from the surface and the aluminum flat bottom hole 100-3
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Figure 2 - Effect of frequency and focal length on test sensitivity: (a) signal to noise ratio versus round trip water path delay for aluminum flat bottom hole 100-3; (b) signal to noise ratio versus water path round trip delay for copper bottom hole 250-6.
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Figure 3 - Effect of frequency and focal length on signal to noise ratio: (a) aluminum flat bottom hole 100-3; (b) copper flat bottom hole 250-6.
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