An analysis of sandwich and regulated path length interferometries is used to determine 3-D displacement. The combination of the two techniques provides a reliable means for unambiguous determination of displacement. To demonstrate the efficiency of the combination displacement measurement is made of object surface points on a steel beam. The accuracy of sandwich hologram interferometry is replicable for a series of measurements and does not fall below the value needed in industrial measurements.
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Füzessy et al. (1982) studied this question.
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