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° phase distribution. The results indicate that the process has considerable tolerance to phase mismatch.
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