Title:
NONDESTRUCTIVE TESTING METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/013802
Kind Code:
A1
Abstract:
Provided is a nondestructive testing method capable of diagnosing the state of an object to be tested, using a single ultrasonic pulse signal. The attenuated waveform of the single ultrasonic pulse signal received by a reception unit (3) is wavelet transformed by a wavelet transform unit (6) to thereby obtain the envelope (A(t)) and phase (Ø(t)) of the attenuated waveform. A frequency time change calculation unit (7) makes an approximation by an approximate expression capable of calculating the attenuated waveform using the envelope (A(t)) and phase (Ø(t)) of the attenuated waveform which are inputted from the wavelet transform unit (6) and finds the change of the instantaneous frequency of the attenuated waveform over time. A diagnosis unit (8) diagnoses the state of the object to be tested, on the basis of the change of the instantaneous frequency over time which is calculated by the frequency time change calculation unit (7).
Inventors:
INOUE TAKUMI
Application Number:
PCT/JP2010/062905
Publication Date:
February 03, 2011
Filing Date:
July 30, 2010
Export Citation:
Assignee:
UNIV KYUSHU NAT UNIV CORP (JP)
INOUE TAKUMI
INOUE TAKUMI
International Classes:
G01N29/04
Foreign References:
| JP3705960B2 | 2005-10-12 | |||
| JP2004340807A | 2004-12-02 |
Other References:
TAKUMI INOUE ET AL.: "Estimation of Time- Varying Vibration Parameters by the Segmental Use of the Harmonic Wavelet", TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS, SERIES C, vol. 74, no. 741, May 2008 (2008-05-01), pages 1145 - 1153
TAKUMI INOUE ET AL.: "Choonpa Shuhasu Hencho no Kenshutsu ni yoru Buttai Naibu no Jotai Sokutei", THE JAPAN SOCIETY OF MECHANICAL ENGINEERS, DYNAMICS AND DESIGN CONFERENCE, no. 09/23, 5 August 2009 (2009-08-05)
TAKUMI INOUE ET AL.: "Choonpa Shuhasu Hencho no Kenshutsu ni yoru Buttai Naibu no Jotai Sokutei", THE JAPAN SOCIETY OF MECHANICAL ENGINEERS, DYNAMICS AND DESIGN CONFERENCE, no. 09/23, 5 August 2009 (2009-08-05)
Attorney, Agent or Firm:
NISHIURA Tsuguharu (JP)
Tsugiharu Nishiura (JP)
Tsugiharu Nishiura (JP)
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