Estimation of inner state using instantaneous frequency of ultrasonic wave

Takahiro Nakano, Takumi Inoue

研究成果: ジャーナルへの寄稿記事

抄録

Pulse-echo method is a conventional ultrasonic inspection. This method detects a crack as the reflection of ultrasonic pulse at the crack. However, this method is ineffective to detect a closed crack which shows an indistinct reflection. In this study, the authors propose use of instantaneous frequency of the ultrasonic pulse in order to detect the closed crack. The instantaneous frequency can distinguish the slight difference in a frequency of the ultrasonic pulse passing through the crack because the instantaneous frequency expresses the frequency variation in detail. It is difficult for the usual Fourier transform to catch a small change in ultrasonic frequency because of wide spread property and indistinct peak. Feasibility of the proposed method is demonstrated through simple experiments.

元の言語英語
ページ(範囲)135-142
ページ数8
ジャーナルTheoretical and Applied Mechanics Japan
60
出版物ステータス出版済み - 7 9 2012

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Instantaneous Frequency
Ultrasonic Wave
Ultrasonic waves
ultrasonic radiation
Crack
Ultrasonics
Cracks
cracks
ultrasonics
pulses
Closed
Inspection
Fourier transform
Fourier transforms
Express
inspection
echoes
Experiment
Experiments

All Science Journal Classification (ASJC) codes

  • Mathematics(all)
  • Condensed Matter Physics
  • Mechanics of Materials

これを引用

Estimation of inner state using instantaneous frequency of ultrasonic wave. / Nakano, Takahiro; Inoue, Takumi.

:: Theoretical and Applied Mechanics Japan, 巻 60, 09.07.2012, p. 135-142.

研究成果: ジャーナルへの寄稿記事

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