Mounting for an airborne telescope

Details Mounting for an airborne telescope Mounting for an airborne telescope

1983-01-18

1984-12-25

Henry, Jon W.

350505, G02B 2306, G02B 2316

Patent

active

044900260

ABSTRACT:
A Cassegrain-type telescope includes a tertiary mirror for off-axis folding of the telescope-viewing axis, the tertiary mirror being located at offset from the center of gravity of the telescope. A first telescope-positioning drive is operative about the axis-folded output of the tertiary mirror and is therefore subject to varying imbalance torque; but a torque-motor auxiliary drive is operative about the same axis of telescope-positioning drive, to compensate for the imbalance torque.

REFERENCES:
patent: 3580363 (1971-05-01), Plawner et al.
patent: 4395095 (1983-07-01), Horton
Robert M. Cameron, "NASA's 91-cm. airborne Telescope", Sky & Telescope, Nov. 1976, pp. 327-331.

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