Abstract
The deformation of an object illuminated from two directions is recorded once on a hologram as a series of two-dimensional, grating-like interference fringes. The transparency on which the reconstructed interferogram is recorded acts as a modulated diffraction grating (MDG). When the MDG is illuminated by two plane waves and two suitably selected components of its Fourier spectrum are superposed and spatially filtered, two-beam interferograms which represent in-plane and out-of-plane components of deformation are obtained separately. Fringe multiplication was also possible. The interferogram of in-plane deformation corresponding to a spacing of 0·224 μm per fringe was obtained experimentally.
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