Tracker using angle-converting cones
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United States of America Patent
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Jun 11, 1991
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N/A
app pub date -
Feb 23, 1990
filing date -
Apr 22, 1985
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Expired
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Abstract
An optical tracker includes a plurality of detectors (20, 22), each of which is associated with an etendue-preserving concentrator (27, 28) that directs radiation to it. The concentrators (27, 28) associated with complementary detectors (20, 22) are oriented at angles with respect to each other such that their complementary angle-sensitive regions overlap. As a consequence, the outputs of the detectors can be used to aim the tracker even though the concentrators direct radiation to the detectors in a non-imaging manner.
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