Interference holography with a pulsed ruby laser is used as a tool for analyzing complex mechanical vibrations. With the aid of a moire technique, the combination of two interferograms taken in special, electronically controlled conditions yields the contribution to the vibration pattern corresponding to a single frequency. Quantitative analysis then follows the same lines as in ordinary holographic interferometry.
© 1983 Optical Society of America
R. A. Rooth, H. J. Frankena, and F. H. Groen, "Moire method to determine separate frequency contributions in vibration patterns," Appl. Opt. 22, 233-236 (1983)