Optics: image projectors – Heliostats
Patent
1977-10-21
1980-06-24
Shepperd, John W.
Optics: image projectors
Heliostats
126424, 350288, 356371, G02B 508
Patent
active
042092361
ABSTRACT:
A heliostat reflector assembly for a solar central receiver system comprises a light-weight, readily assemblable frame which supports a sheet of stretchable reflective material and includes mechanism for selectively applying tension to and positioning the sheet to stretch it to optical flatness. The frame is mounted on and supported by a pipe pedestal assembly that, in turn, is installed in the ground. The frame is controllably driven in a predetermined way by a light-weight drive system so as to be angularly adjustable in both elevation and azimuth to track the sun and efficiently continuously reflect the sun's rays to a focal zone, i.e. central receiver, which forms part of a solar energy utilization system, such as a solar energy fueled electrical power generation system. The frame may include a built-in system for testing for optical flatness of the reflector. The preferable geometric configuration of the reflector is octagonal; however, it may be other shapes, such as hexagonal, pentagonal or square. Several different embodiments of means for tensioning and positioning the reflector to achieve optical flatness are disclosed. The reflector assembly is based on the stretch frame concept which provides an extremely light-weight, simple, low-cost reflector assembly that may be driven for positioning and tracking by a light-weight, inexpensive drive system.
REFERENCES:
patent: 1696003 (1928-12-01), Harvey
patent: 1989999 (1935-02-01), Niederle
patent: 3289298 (1966-12-01), Standridge
patent: 3635547 (1972-01-01), Rushing et al.
patent: 3867019 (1975-02-01), Eyerman
patent: 3906927 (1975-09-01), Caplan
Horton Richard H.
Zdeb John J.
Clouse, Jr. Clifton E.
Gaither Roger S.
Lupo R. V.
Shepperd John W.
The United States of America as represented by the United States
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