13 June 2005 Automatic detection of the natural frequencies using digital shearography
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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.
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Y. Gan, Y. Gan, G. Kupfer, G. Kupfer, W. Steinchen, W. Steinchen, } "Automatic detection of the natural frequencies using digital shearography", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); doi: 10.1117/12.613113; https://doi.org/10.1117/12.613113

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