Time-averaged holography for the study of three-dimensional vibrations

Stroboholography for the Analysis of Vibration Modes of Mechanical Systems

“…(8) which after evaluation of strobo pulse duration, total exposure time of the hologram and making the necessary rearrangements will take the same form as Eq. (12). It is obvious that this expression will be correct only I case when the number of strobo pulses during hologram exposure time is significantly greater that the frequency ratio q of the vibration components.…”

“…Thus when frequency ratio of the vibration components is irrational number the proposed methodology ensures visualization of time averaged interferogram of vibration form for one of the vibration components of the tested object. Let us analyse equation (12) when frequency ratio of vibration components is rational number. It is assumed that f 2 > f 1 and f 2 / f 1 = q, where q = 2,3, ....…”