Theoretical background along with experimental results are given
for a simple method for in-plane fringe enhancement in dual-beam
illumination holographic interferometry. In this method, the
fringes representing in-plane displacements arise as a moiré
pattern between two interferograms. To distinguish the in-plane
displacement, a sequence of images is recorded while the reference
mirror is continuously tilted at random. The in-plane fringes are
then found as the maximum contrast of the out-of-plane fringes in the
image sequence. The resulting fringe quality is close to the
quality of the out-of-plane fringes.
© 1998 Optical Society of America
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