Experimental Mechanics

, Volume 13, Issue 8, pp 339–344

Vibration analysis of plates by real-time stroboscopic holography

The authors discuss the versatility of real-time vs. time-averaged holography for vibration analysis
  • C. R. Hazell
  • S. D. Liem
Article

DOI: 10.1007/BF02322393

Cite this article as:
Hazell, C.R. & Liem, S.D. Experimental Mechanics (1973) 13: 339. doi:10.1007/BF02322393

Abstract

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

d

amplitude of vibration

Io

intensity distribution of reconstructed image of static object

Ir

intensity ofIo modulated by fringe function

Jo

zero-order Bessel function

N

fringe order

λ

wavelength of light

ΩN

zeroes ofJo

θ> 1

angle between direction of object illumination and direction of vibration

θ2

angle between direction of object viewing and direction of vibration

Copyright information

© Society for Experimental Mechanics, Inc. 1973

Authors and Affiliations

  • C. R. Hazell
    • 1
  • S. D. Liem
    • 1
  1. 1.Department of Mechanical EngineeringThe University of British ColumbidVancouver 8Canada