Dual shear wavefront sensor
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United States of America Patent
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Sep 29, 1987
Grant Date -
N/A
app pub date -
Jul 3, 1985
filing date -
Jul 3, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A wavefront of light is focused upon a first shearing interferometer having a relatively large shear and small dynamic range and a relatively minor portion of the light is focused upon a second shearing interferometer having a relatively small shear but large dynamic range. Owing to the limited dynamic range of the first shearing interferometer a plurality of a plurality of virtual candidate measurements are manifest which are compared with the temporally and/or spatially averaged values of each measurement produced by the second shearing interferometer and the closest match is employed to obtain a highly accurate unambiguous reading of the wavefront slope measurements.
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