| 摘要 |
An optical tracker includes a plurality of detectors (20, 22), each of which is associated with an étendue-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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