S
Satoshi Nagai
Researcher at Toshiba
Publications - 113
Citations - 911
Satoshi Nagai is an academic researcher from Toshiba. The author has contributed to research in topics: Ultrasonic sensor & Signal. The author has an hindex of 15, co-authored 113 publications receiving 891 citations.
Papers
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Journal ArticleDOI
Crack detection and sizing technique by ultrasonic and electromagnetic methods
TL;DR: In this paper, a 256-channel array system has been developed for the inspection of weldment of BWR internal components such as core shrouds and the TOFD crack sizing technique also can be applied using this system.
Patent
Welding system and welding method
Takahiro Miura,Yamamoto Setsu,Takeshi Hoshi,Tsuyoshi Ogawa,Yoshihiro Fujita,Shozo Hirano,Kazumi Watanabe,Satoshi Nagai,Masahiro Yoshida,Jun Semboshi,Satoru Asai,Makoto Ochiai +11 more
TL;DR: In this article, a welding system has: a welding mechanism, a reception laser light source, an optical mechanism, an interferometer, a data recording/ analysis mechanism and a data analysis/analysis mechanism.
Journal ArticleDOI
Risk-based inspection and maintenance systems for steam turbines
Kazunari Fujiyama,Satoshi Nagai,Yasunari Akikuni,Toshihiro Fujiwara,Kenichiro Furuya,Matsumoto Shigeru,Kentaro Takagi,Taro Kawabata +7 more
TL;DR: In this paper, a risk-based maintenance (RBM) system was developed for steam turbine plants coupled with the quick inspection systems, where the failure modes are determined for each component of steam turbines and the failure scenarios are described as event trees.
Journal ArticleDOI
Development of Under-sodium Three-dimensional Visual Inspection Technique Using Matrix-arrayed Ultrasonic Transducer
Hirokazu Karasawa,Mamoru Izumi,Takehiko Suzuki,Satoshi Nagai,Masaaki Tamura,Shyuuichi Fujimori +5 more
TL;DR: In this paper, an under-sodium ultrasonic visual inspection technique was developed in order to observe in-vessel structures in a Fast Breeder Reactor (FBR) whose reactor vessel is filled with opaque liquid sodium.
Patent
Welding inspection method and apparatus thereof
Yamamoto Setsu,Takahiro Miura,Takeshi Hoshi,Tsuyoshi Ogawa,Yoshihiro Fujita,Shozo Hirano,Kazumi Watanabe,Satoshi Nagai,Masahiro Yoshida,Satoru Asai,Makoto Ochiai,Jun Semboshi +11 more
TL;DR: In this article, a welding inspection method has steps of: generating transmission laser light for generating an ultrasonic wave and transmitting the transmitted laser light to an object to be inspected during or after welding operation for irradiation.