An optical system based on in-line digital holography for the
evaluation of deformations is described. In-line holograms are
recorded on a CCD chip. The problem of overlapping twin images
typical for the in-line arrangement is solved by digital reconstruction
and filtering of the unwanted wave fronts. Two separate
interferograms of an object under test in its undeformed and deformed
states are recorded each on a CCD chip. The phases of the two wave
fronts are obtained from the complex amplitudes of the digital
reconstructed wave fronts, and the deformation is calculated from the
phase differences. Experimental results are presented.
© 1998 Optical Society of America
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