Development of a microwave nondestructive testing method for the long-range inspection of corrosion under insulation

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14298
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Energy engineering
• Research Institution: Tohoku University
• Principal Investigator: Yusa Noritaka 東北大学, 工学研究科, 准教授 (60466779)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 電磁非破壊検査 / マイクロ波 / 広域検査 / 配管

Outline of Final Research Achievements

This study aimed at the development of a nondestructive testing method using microwave for the long-range inspection of corrosions under insulations. Three-dimensional finite element simulations were conducted, whose results revealed that situating coaxial cables carrying TEM microwave circumferentially with an equal distance enables to convert TEM microwave propagating inside the coaxial cables into another TEM microwave propagating inside insulators. Subsequent experimental verifications were performed using a eight-way power divider and double pipes with artificial grooves simulating a corrosion under insulation. The experiment confirmed a clear signals due to the artificial grooves, and the time-of-flight of the signals agreed well with the actual location of the artificial grooves.

Free Research Field

原子力工学