Optical: systems and elements – Deflection using a moving element – Pivotal or rotational element
Patent
1992-09-04
1993-08-24
Arnold, Bruce Y.
Optical: systems and elements
Deflection using a moving element
Pivotal or rotational element
359861, 359900, G02B 2608, G02B 508
Patent
active
052394042
ABSTRACT:
A system and method for optically scanning a scene are disclosed. The system is rotated about a pitch axis and a roll axis to provide the desired scanning capability. The system consists of a primary mirror, a secondary mirror, a tertiary mirror and a fold mirror. The fold mirror is located between the primary and secondary mirrors and reflects the light from the field of view along the pitch axis of the system. The light is reflected by a series of plane fold mirrors to the roll axis and out through an exit aperture. Because the light is reflected along the pitch axis and roll axis, the system can be rotated about these axes while the optical output is maintained as required. Rotation about these axes through internal points between the primary and secondary mirrors minimizes the volume swept out by the system during rotation and maximizes the angles through which the system can be rotated.
REFERENCES:
patent: 4101195 (1978-07-01), Korsch
patent: 4406525 (1983-09-01), Itoh et al.
patent: 5144496 (1992-09-01), Kashima
M. Tarenghi et al., "The ESO NTT (New Technology Telescope): The first active optics telescope," SPIE vol. 1114 Active Telescope Systems Mar. 1989, pp. 302-313.
Jarmuz Paul
McLaughlin Joseph L.
Arnold Bruce Y.
Litton Systems Inc.
Phan James
Rotella Robert F.
Wallach Michael H.
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