Development of a non-contact ultrasonic sensor for application to pipe-wall thinning inspection in power plants
田村 明紀 古市 肇 河野 尚幸 （日立製作所) 大城戸 忍 （日立GE) Chenghuan Zhong Matt Butcher （Inductosense Ltd) Anthony J. Croxford Paul D. Wilcox （University of Bristol)
non-contact measurementPipe-wall thinningultrasonic testingwireless sensor
A pipe-wall thinning measurement is required to ensure integrity of a piping system in a power plant. Aiming to reduce the inspection time of the pipe-wall thinning measurement, we have been developing an innovative measurement technology which enables the pipe-wall thinning inspection without removing the insulation, based on the non-contact ultrasonic sensor proposed by University of Bristol. To apply this technology to the actual plant inspection, sensor calibration and extension of measurable thickness range are required. In this study, we have proposed a concept of online calibration method and shear wave measurement system to enable smaller thickness measurement. We have experimentally confirmed their performance in the feasibility tests.