Abstract
A conventional schlieren system was converted into a Kraushaar interferometer by
the addition of matched diffraction gratings as the beam splitting and
recombination elements. Optical quality of the added features of this
installation were shown to be not a limiting factor, but the optical platform
must be isolated well for good results. Basic optical theory applicable to this
device is summarized. Several aspects are indicated which enhance the fringe or
image quality. This device has been used to find the surface pressures and flow
field structure around some simple two-dimensional airfoil shapes. Comparison of
these results with calculations indicates good agreement between the diffraction
grating interferometer data and analytical data.
© 1969 Optical Society of America
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