In the ultrasonic testing for periodic inspection of nuclear power plants, it is necessary to decide the inspection condition and probe scanning range before the inspection. Especially, ultrasonic propagation analysis was difficult for complex curved component such as nozzle parts. Therefore, we have developed an ultrasonic propagation simulation technique for three-dimensional complex curved objects based on the definition of curved surface functions and virtual scanner. We can examine appropriate ins...
英字タイトル:
Development of Ultrasonic Propagation Simulation Technique for Three-Dimensional Complex Curved Surface Shape

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

真庭 一彦 Kazuhiko MANIWA Guided wave inspection technique is effective for detecting defects like corrosion in piping, because it can perform long range inspection. It is possible to expect this inspection as a metho d that leads to the decrease of the inspection process and its cost, because the incidental work can be reduced. Especially, the contraction effect of the inspection work is extensive in larg e-diameter piping inspection. In this paper, we introduce the guided wave inspection system to large-d...
英字タイトル:
Wall Thinning Inspection Technique for Large-Diameter Piping using Guided Wave