| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detector capable of detecting a flaw or measuring plate thickness by transmitting and receiving transversal ultrasonic waves having a low frequency to/from the inside of an inspection object material by using a low-viscosity couplant. SOLUTION: In this ultrasonic flaw detector 20A, ultrasonic vibrators 42a and 42b contact a flaw detection surface 21a of the inspection object material 21, and time delay circuits 41 give time delay values to a signal processing system 45 and pulse generators 26 and 27. The pulse generators 26 and 27 sequentially apply pulses to the respective ultrasonic vibrators 42a and 42b to generate transversal ultrasonic waves as delay echoes along with longitudinal ultrasonic waves in the inspection object material 21; horizontal polarized transversal waves which propagate to the flaw detection surface 21a at a certain angle, and of which the vibration direction is horizontal to the flaw detection surface 21 are transmitted; the horizontal polarized transversal waves reflected in the inspection object material 21 are converted to electric signals to be given to the signal processing system 45; and the signal processing system 45 corrects reception times of the respective horizontal polarized transversal waves by referring to the time delay values, and thereafter executes flaw detection or plate thickness measurement of the inspection object material by adding and analyzing them. COPYRIGHT: (C)2008,JPO&INPIT
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