Effect of phase mismatch on pseudo-phase-step analysis of time-average hologram recordings of vibration modes.
I present the results of an experiment to demonstrate the effect of phase mismatch between an object vibration and a bias vibration in pseudo-phase-step analysis of time-average holographic interferograms of vibration modes. Pseudo-phase-stepping applies conventional phase-step equations to zero-order Bessel function fringes and during phase unwrapping corrects for the errors incurred. A circular disk vibrating in a quadrature combination of its two one-diameter modes was used as a test object and provided a 360 degrees phase distribution. The results indicate that the process has considerable tolerance to phase mismatch.
Stetson
Karl A
KA
Karl Stetson Associates, LLC, Coventry, CT 06238, USA. kastetson@snet.net