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A Numerical Simulation Of The Quasi-Heterodyne Technique For Double-Pulsed Holographic Vibration Measurements

Double-pulsed holography is an established technique in which the interference pattern between two holographic images shows a fringe pattern which is representative of a vibrating object's response shape. The technique has many industrial applications, a number of which would benefit from an accurate and reliable means of converting the fringe information into numeric data. By the use of a seperate reference beam for each of the measurement pulses it is possible to apply the Quasi-heterodyne technique, also known as fringe-shifting, to convert the fringe information directly into displacement information. This paper demonstrates a numerical simulation of the Quasi-heterodyne process and its use to investigate the error sources which may be present in a real optical system.