Ultrasonic transducer is used to detect flaws. What is the smallest flaw that can be detected by ultrasonic technology? One thing I know is that higher the frequency, higher is the sensitivity of the transducer i.e. smaller is the size of the flaw it can detect.
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Depends on the material for one thing. In theory, one could detect any flaw by looking at phase mismatch of the returns (only weakly depends on wavelength), for another. – Carl Witthoft Mar 10 '17 at 16:14