高温超音波センサの開発
Development of High Temperature Ultrasonic Transducers
著者:
馬場 淳史 Atsushi BABA 武捨 義則 Yoshinori MUSHA 小池 正浩 Masahiro KOIKE 大谷 健一 Kenichi OTANI 平塚 真弘 Masahiro HIRATSUKA
発刊日:
公開日:
high temperaturelithium niobatesingle crystalultrasonic transducer
概要
Abstract Structural health monitoring (SHM) techniques are needed to maintain the reliability of power plants for long term operation. The high temperature transducers are necessary to realize SHM (monitor wall thickness of the pipings, crack growth in the materials and material evaluation) under the working condition of power plants. We have evaluated lithium niobate (LiNb03) single crystal which is well known as a high Curie temperature piezoelectric material to develop high temperature ultrasonic transdu cers. The LiNbO3 was bonded onto a stainless steel substrate. The experimental transducer was heated in an electric furnace while measuring the bottom echoes from the substrate. We confirmed that the experimental high temperature transducer could work up t o 1000 °C. Thermal and chemical stability of LiNbO3 were confirmed using TG measurement up to 1260°C (melting point). Additionally, we have developed single and array transducers for high temperature ultrasonic measurement based on those experimental data.
