Determination of the transfer function of an optical instrument
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United States of America Patent
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-
Sep 20, 1988
Grant Date -
N/A
app pub date -
Jul 10, 1986
filing date -
Jul 10, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For measuring the optical transfer function of an optical instrument having an input pupil, a device comprises a source of spatially coherent light for illuminating the pupil of the instrument. Two separate zones are isolated in the input pupil of the instrument by a system comprising a grating, a lens for forming an image and a spatial filter which eliminates the zero diffraction order. The two zones have a spacing which is in direct relation to the spatial frequency. The position and mutual spacing of the fringes are determined. A computer derives the transfer function from the measurements made for a plurality of pairs of zones.
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