Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-09-27
1995-07-18
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359201, 359203, 359216, G02B 2608
Patent
active
054346967
ABSTRACT:
A method and a device for diametric active scanning of a forward region using a collimated beam of radiation energy to detect and track target objects by collecting beam energy scattered by the objects. Each scan line of the beam proceeds from an edge of a circular field-of-view through the center to the opposite edge. The azimuthal scan angle is advanced by a constant increment for each successive scan, and scanning progresses uniformly and continuously. A device implementing the method includes a rotor assembly having first and second angled reflectors which rotates within a concentric ring which includes an array of curved reflecting facets. A collimated beam emitted by a radiation source is reflected by the first reflector onto contiguous segments of each successive facet instantaneously aligned with the reflected beam path, the beam being obliquely re-reflected and redirected to the second angled reflector which reflects and redirects the beam so as to scan a rotating pattern of diametric scan traces.
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Ben Loha
Kong Steve
McTaggart J. E.
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