Patent ID: 7600442
Filing Date: 2009-10-13
Classification: G01N

Abstract:
1. An ultrasonic probing method utilizing a resonance phenomenon, by which: a step function voltage is applied to a vibrator in a transmission probe; and a wide band ultrasonic wave is continuously transmitted from the transmission probe and a wide band ultrasonic wave from the probing target is received by a receiving probe; wherein a measurement is performed in the state where the transmission probe and the receiving probe are located away from each other on a surface of the probing target, the method having: a receiving function of obtaining a received wave G an arithmetic operation function of obtaining a spectrum F a display function of providing a comparative display of the received wave G a function of generating longitudinal cursors f a function of performing an arithmetic operation/display of a thickness W of the probing target from the values of the longitudinal cursors and a sonic velocity V a function of obtaining a longitudinal cursor f the method comprising: a first step of extracting a narrow band spectrum FA a second step of providing a comparative display of the component wave GA a third step of determining the position of a flaw inside the probing target right below a line segment connecting the center of the transmission probe and the center of the receiving probe, based on at which of the measurement points a wave can be confirmed to be generated on the screen of the comparative display of the component wave GA