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NDE by means of frequency sweep excitation and spectrogram method

SHOICHIRO NAGATA1, MASATO ENOKIZONO2,*

Affiliation

  1. University of Miyazaki, 1-1 Gakuenkibanadai-nishi, Miyazaki, 889-2192, Japan
  2. Oita University, 700 Dannoharu, Oita, 870-1192, Japan

Abstract

This paper presents a strategy and a system configuration for eddy current testing, which can improve measurement quality and reduce the total time of tests for crack detection. A frequency sweep excitation and spectrogram method (FSES) is proposed. An experimental system is developed for arbitrary single-frequency excitation by using phase-locked loop (PLL) frequency synthesizer. The experimental results shows very high signal to noise ratios and also make it easier to carry out non-destructive evaluations..

Keywords

Eddy currents, Crack detection, Frequency sweep excitation.

Submitted at: March 13, 2008
Accepted at: May 14, 2008

Citation

SHOICHIRO NAGATA, MASATO ENOKIZONO, NDE by means of frequency sweep excitation and spectrogram method, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 5, pp. 1165-1168 (2008)