ULTRASONIC FLAW DETECTING METHOD

摘要

PURPOSE:To decide the kind of a defect with high sensitivity and high accuracy by making an ultrasonic wave beam incident continuously at a difference angle according to the combination of the transmission and reception delay times of the vibrators of an array probe, and finding the directivity of the defect from the angle of incidence and an echo signal. CONSTITUTION:The transmission and reception of the array probe 1 where (n) vibrators are arranged linearly are performed by a vibrator group selected by a transmission/reception controller 6 at the time set by a delay time controller 9. Echoes received by respective vibrators are adjusted in phase by the set time and the echo signal composed by a delay adder 10 is displayed on a waveform display device 12. Received echoes obtained at intervals of the incidence angle are inputted to a signal processor 13 and the directivity of the defect 5 is found from the relation between the incidence angle of the ultrasonic beam 4 and the signal. The defect 5 has the directivity corresponding to its shape and a pattern corresponding to the defect is obtained to easily decide the kind of the defect with the high sensitivity and high accuracy.