テラヘルツ波の反射と可変視野角を用いた遮熱コーティングの屈折率測定

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2014/08/01

タイトル(英語): Measurement of Refractive Index of Thermal Barrier Coating using Reflection of Terahertz Waves and Variable Aperture

著者名: 福地　哲生（（一財）電力中央研究所 電力技術研究所），布施　則一（（一財）電力中央研究所 電力技術研究所），水野　麻弥（（独）情報通信研究機構 電磁波計測研究所），福永　香（（独）情報通信研究機構 電磁波計測研究所）

著者名(英語): Tetsuo Fukuchi (Central Research Institute of Electric Power Industry), Norikazu Fuse (Central Research Institute of Electric Power Industry), Maya Mizuno (National Institute of Information and Communications Technology), Kaori Fukunaga (National Institute of Information and Communications Technology)

キーワード: テラヘルツ波，遮熱コーティング，屈折率，表面粗さ，反射率，散乱　　terahertz wave，thermal barrier coating，refractive index，surface roughness，reflectivity，scattering

要約(英語): A method to measure the refractive index of the ceramic layer of thermal barrier coating (TBC), based on the intensity ratio of the reflections of terahertz waves from the ceramic surface and a reference metal plate, is proposed. The method uses a variable aperture to change the relative proportions of specular reflection and scattering from the ceramic surface. The refractive index is calculated from the specular reflectivity, which is obtained from the intensity ratio when the field of view is extrapolated to zero. Measurement of a TBC specimen resulted in a refractive index of 4.7, which was in agreement with the refractive index of the ceramic material obtained by terahertz time domain reflectometry. In addition, the surface roughness of the ceramic surface was obtained based on the frequency characteristics of the reflections from the ceramic surface and a reference metal plate. A surface roughness of 14µm was obtained, which was in agreement with the microscopic observation result of a TBC specimen whose coating was applied in the same lot as the specimen used in the measurement.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.134 No.8 （2014）

本誌掲載ページ: 478-484 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/134/8/134_478/_article/-char/ja/