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High S/N Ratio Guided Wave Inspection of Pipe Using Chirp Pulse Compression

[+] Author Affiliations
Kiyokazu Toiyama, Takahiro Tsutsumoto

Western Industrial Research Institute of Hiroshima Prefecture, Kure, Hiroshima, Japan

Takashi Ikeda

CXR Corporation, Kure, Hiroshima, Japan

Takahiro Hayashi

Nagoya Institute of Technology, Nagoya, Aichi, Japan

Paper No. PVP2004-2812, pp. 41-45; 5 pages
doi:10.1115/PVP2004-2812
From:
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4679-2
  • Copyright © 2004 by ASME

abstract

Guided wave is expected as the most promising technique for rapid long-range inspection of pipes. However, signal to noise ratio is still required to be improved, especially in highly attenuative pipes covered with heat insulator and/or buried in the ground. Recently, pulse compression technique has been developed as an effective means for improving S/N ratio in the field of radar detection. In this paper, chirp pulse compression technique was applied to the long-range inspection of pipe using guided wave. The technical brief explanation about chirp pulse compression was described. Example data signals of burst wave excitation way and chirp pulse excitation way with commonly -used amplifier were reviewed with respect to unwanted side lobe. The cause of a side lobe was investigated, and the amplifier with excellent distortion property was presented to improve S/N ratio of system with quite vanishing of side lobe.

Copyright © 2004 by ASME

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