This Demonstration illustrates the formation of time-averaged
Moiré fringes. The horizontal axis represents the amplitude of
harmonic oscillation ; the vertical axis, the longitudinal
coordinate . The stationary Moiré grating is shown at . Time-
averaged images of the Moiré grating are shown at increasing
amplitudes of oscillation. The parameter controls the number of
discrete time nodes in a period of the oscillation used to
integrate the dynamical process. Double-exposure fringes are
produced at ; time-averaged fringes are produced at . You can
choose the type of the Moiré grating—it can be harmonic,
stepped, or stochastic. Moreover, you can observe two digital
images. The first is the time-averaged Moiré image and the
second is the filtered image in which time-averaged fringes are
shown in high contrast. Interesting time-averaged patterns can
be observed whenever a regular Moiré grating is replaced by a
set of random numbers uniformly distributed in the interval .
Those patterns can reveal certain propertie