Moire method to determine separate frequency contributions in vibration patterns.
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.
Rooth
R A
RA
Institute of Applied Physics, Delft, The Netherlands.
Frankena
H J
HJ
Groen
F H
FH