Detection of inner abnormality by the frequency modulation of ultrasonic wave

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationCOMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management
Pages281-287
Number of pages7
Publication statusPublished - Sep 10 2010
Event23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010 - Nara, Japan
Duration: Jun 28 2010Jul 2 2010

Publication series

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

Other

Other23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010
CountryJapan
CityNara
Period6/28/107/2/10

Fingerprint

Ultrasonic waves
Frequency modulation
abnormality
Ultrasonics
Inspection
Fourier transforms
Modulation
Derivatives
Fourier transform
detection
Experiments
experiment

All Science Journal Classification (ASJC) codes

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

Cite this

Nakano, T., Inoue, T., Sugiyama, T., & Yamanaka, S. (2010). Detection of inner abnormality by the frequency modulation of ultrasonic wave. In 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).

Detection of inner abnormality by the frequency modulation of ultrasonic wave. / Nakano, T.; Inoue, Takumi; Sugiyama, T.; Yamanaka, S.

COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management. 2010. p. 281-287 (COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nakano, T, Inoue, T, Sugiyama, T & Yamanaka, S 2010, Detection of inner abnormality by the frequency modulation of ultrasonic wave. in COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management. 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, 23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010, Nara, Japan, 6/28/10.
Nakano T, Inoue T, Sugiyama T, Yamanaka S. Detection of inner abnormality by the frequency modulation of ultrasonic wave. In COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management. 2010. p. 281-287. (COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management).
Nakano, T. ; Inoue, Takumi ; Sugiyama, T. ; Yamanaka, S. / 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. 2010. 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).
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