The properties of the moiré fringes in Talbot
interferometry are analyzed for a small inclined angle β between the
two grating planes, which is produced by rotation of the beam splitter
grating about the axis perpendicular to the lines of the
grating. Theoretical analyses indicate that the tilt angle of the
resultant moiré fringes is less sensitive to β than when the
small inclined angle is formed by rotation of the beam splitter grating
about the axis parallel to the lines direction of the grating as
described earlier [Appl. Opt. 38, 4111 (1999)] and
that contrast of the moiré fringes decreases with an increase in
β or in the spatial frequency of the grating and may result in
impaired measurement accuracy. The validity of the theoretical
analyses is illustrated by experiments.
© 2000 Optical Society of America
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