A pipe inspection system using ultrasonic guided wave with inter-digital transducer was developed. In this system, for uni-directional transmission, a pair of transducer is set axially on the pipe with a separation of one-quarter of the wavelength, and a one-quarter period delayed anti-phased waveforms are applied to the pair. By this method, the amplitude of the syn thetic traveling wave in the minus direction can be completely decreased to zero in theory. For 50A pipe specimen, artificial discontinuities...
英字タイトル:
A Pipe Inspection System Using Ultrasonic Guided Wave

Ultrasonic Integrity of anchor bolts of nuclear power plants is evaluated using test bolts with 1.6mm and 3.2 mm EDM notches. All notches are detected by the following three ultrasonic testing methods: longitudinal normal beam method, hased array (sectorial scanning) method and 3-dimensional phased array method. It is effective in detection of notches to use visual images obtained by ultrasonic phased array m ethods. Additionally, 3D phased array technique can provide fast und wide evaluation of integrity ...
英字タイトル:
Ultrasonic integrity evaluation of Anchor Bolts of Nuclear Power Plants