NASA NTRS · 19730042030
Circular carrier-frequency photography for observing phase objects.
Abstract
A circular grating is photographed through a phase object which deforms the image of the grating lines. By super-imposing these deformed lines with a master grating on photographic film, moire patterns are observed. These patterns are interpreted as fringes of constant radial derivative.
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Silva, D. E., Hong, Y. M.. 1973-03-01. Circular carrier-frequency photography for observing phase objects.. https://ntrs.nasa.gov/citations/19730042030
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