Vibration analysis of plates by real-time stroboscopic holography
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The application of time-averaged holography to the analysis of vibrating surfaces is now a widespread and very powerful experimental technique. However, the realtime method of exactly superimposing the reconstructed static image on the vibrating object and observing the resulting fringe patterns under stroboscopic illumination is becoming more common. In fact, by introducing an initial family of interference fringes by the rotation of the object (or image) before vibration begins, the advantages of both methods are combined.
List of Symbols
amplitude of vibration
intensity distribution of reconstructed image of static object
intensity ofIo modulated by fringe function
zero-order Bessel function
wavelength of light
- θ> 1
angle between direction of object illumination and direction of vibration
angle between direction of object viewing and direction of vibration
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