Development of Under-sodium Three-dimensional Visual Inspection Technique Using Matrix-arrayed Ultrasonic Transducer

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概要

• 論文の詳細を見る

• We have developed an advanced under-sodium ultrasonic visual inspection technique in order to observe in-vessel structures in a Fast Breeder Reactor (FBR) whose reactor vessel is filled with opaque liquid sodium. The final goal of this work is achievement of resolution equivalent to that of an image obtained by optical fiber scope. The under-sodium ultrasonic visualizing system consists of a matrix-arrayed transducer and a signal-processing device. The matrix-arrayed transducer, in which 36×36 piezoelectric elements are arranged with 5 mm interval and sealed by a thin metal diaphragm, can realize a 3-dimensional image with high resolution. Regarding signal processing, the 3-dimensional image synthetic processing and the cross correlation processing for the purpose of improving S/N ratio of ultrasonic echoes are implemented on a high-speed parallel processor. Under-sodium imaging test was carried out, and it was confirmed that a 3-dimensional image of the blind target, which was prepared without information beforehand, could be visualized clearly with less than 2.0 mm resolution under-sodium.

• 社団法人 日本原子力学会の論文
• 2000-09-25

著者

• Tamura Masaaki

  Research And Development Headquarters Japan Atomic Power Co.

• Suzuki Takehiko

  Corporate Research & Development Center Toshiba Corporation

• Nagai S

  Power And Industrial Systems Research And Development Center Toshiba Corporation

• KARASAWA Hirokazu

  Advanced Reactor Enagineering Department, Nuclear Energy Group, Toshiba Corporation

• IZUMI Mamoru

  Corporate Research & Development Center, Toshiba Corporation

• NAGAI Satoshi

  Power and Industrial Systems Research and Development Center, Toshiba Corporation

• FUJIMORI Syuuichi

  Research and Development Headquarters, Japan Atomic Power Co.

• Izumi Mamoru

  Corporate Research & Development Center Toshiba Corporation

• Fujimori Syuuichi

  Research And Development Headquarters Japan Atomic Power Co.

• Karasawa Hirokazu

  Advanced Reactor Enagineering Department Nuclear Energy Group Toshiba Corporation

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• Development of Under-sodium Three-dimensional Visual Inspection Technique Using Matrix-arrayed Ultrasonic Transducer
• First Record of a Bloom of Thalassiosira diporocyclus in the Eastern Seto Inland Sea
• Long time-series observations in population dynamics of the harmful diatom Eucampia zodiacus and environmental factors in Harima-Nada, eastern Seto Inland Sea, Japan during 1974-2008

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