Paraboloidal reflector alignment system using laser fringe patte

Details Paraboloidal reflector alignment system using laser fringe patte Paraboloidal reflector alignment system using laser fringe patte

1991-01-31

1992-11-10

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Antenna components

343916, 343912, 343703, H01Q 1520

Patent

active

051628112

ABSTRACT:
A paraboloidal antenna system is disclosed which is segmented. Each segment is attached to a back up structure at three points, and is capable of linear normal motion at these points. The segments can be individually adjusted so as to conform to the true paraboloidal surface after the backup structure has been deformed. The adjustable attach points include digitally-controlled actuators. A laser reference system is used to detect deviations from the true paraboloidal contour. The laser beam is split to set up two sources along the paraboloid axis, and the ensuing hyperboloidal fringe pattern is of circular symmetry. Sensors determine the number of fringes lost or gained as the backup structure deforms. This data is used to guide the actuators to correct for the deviations.

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Nelson, Jerry, "The Keck Telescope", published in American Scientist, 1989, vol. 77, pp. 170-176.

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