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Proceedings Paper

Automatic detection of the natural frequencies using digital shearography
Author(s): Y. Gan; G. Kupfer; W. Steinchen
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Paper Abstract

Using the continuously refreshed reference frame in conjunction with the real-time subtraction allows time-averaged shearography to observe and to evaluate the vibrations in form of J02 -fringes in quasi real time. Since the fringe patterns are dependent on the vibration amplitudes, the resonance frequencies of the object can be detected due to the higher amplitudes in resonance. In this presentation a new technique is introduced to automatic detection of the natural frequencies without applying additional sensors by means of statistical method. This method is suitable for the automatic identification of flaws as well. An experimental investigation shows the detection of defects in a CFR material in this publication.

Paper Details

Date Published: 13 June 2005
PDF: 7 pages
Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); doi: 10.1117/12.613113
Show Author Affiliations
Y. Gan, Univ. of Kassel (Germany)
G. Kupfer, Univ. of Kassel (Germany)
W. Steinchen, Univ. of Kassel (Germany)


Published in SPIE Proceedings Vol. 5856:
Optical Measurement Systems for Industrial Inspection IV
Wolfgang Osten; Christophe Gorecki; Erik L. Novak, Editor(s)

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