Detection of inner abnormality by the frequency modulation of ultrasonic wave

T. Nakano, Takumi Inoue, T. Sugiyama, S. Yamanaka

研究成果: 著書/レポートタイプへの貢献会議での発言

抜粋

The conventional ultrasonic inspection is a detection of the ultrasonic wave reflected at the abnormal points in an inspected object. However, the ultrasound passes through an indistinct or minute abnormality. The conventional ultrasonic inspection is unavailable to detect them. In this paper, the authors focus their attention to frequency modulation of the ultrasonic wave, and attempt to detect the minute abnormality by using it. In the proposed method, the frequency modulation is observed as a variation of instantaneous frequency of the ultrasonic wave, and the instantaneous frequency is defined as the derivative of a time-dependent phase angle of the ultrasonic wave. In the case that the indistinct or minute abnormality exists in an object, the authors find that the instantaneous frequency of the ultrasound passing through the abnormality deviates from usual frequency level. Therefore, the abnormality can be detected by the variation of the instantaneous frequency, that is, the frequency modulation. It is difficult for the usual Fourier transform to catch the modulation because of a limitation of a frequency resolution. A feasibility of the proposed method is demonstrated through a simple experiment.

元の言語英語
ホスト出版物のタイトルCOMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management
ページ281-287
ページ数7
出版物ステータス出版済み - 9 10 2010
イベント23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010 - Nara, 日本
継続期間: 6 28 20107 2 2010

出版物シリーズ

名前COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management

その他

その他23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010
日本
Nara
期間6/28/107/2/10

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Management, Monitoring, Policy and Law

これを引用

Nakano, T., Inoue, T., Sugiyama, T., & Yamanaka, S. (2010). Detection of inner abnormality by the frequency modulation of ultrasonic wave. : COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management (pp. 281-287). (COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management).