Interferometric tracking device
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United States of America Patent
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Oct 25, 2011
Grant Date -
Jan 7, 2010
app pub date -
Mar 28, 2008
filing date -
Mar 28, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An interferometric tracking device is disclosed. A first grating is optically coupled to a second grading such that the second grating is rotationally offset from the first grating. Imaging optics are adapted to image light passing through the first and second gratings onto a focal plane array. A plurality of wedge plates are optically disposed between the imaging optics and the second grating, such that the wedge plates generate a plurality of spots on the FPA when light from a point source is incident upon the first grating.
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