1976-05-06
1979-04-10
Evans, F. L.
350363, G05D 2500
Patent
active
041485637
ABSTRACT:
A transparent or reflective panel is comprised of two or more layers of transparent material. The outermost surfaces of the panel are plane. The inner surface of the first layer of the panel is configured so as to form a reflector, as for example, the familiar half-cubic reflector. The second layer is shaped so as to closely conform to the first layer, and the two layers are sealed together at the edges. Between the layers is a fluid, which will be either a vapor or a liquid depending upon temperature. When it is a vapor, light incident upon the panel will be reflected. When the vapor condenses to a liquid, the resulting vacuum pulls the layers of the panel closely together, and the liquid condensate fills whatever spaces may remain between the layers. This provides an optical continuum through the panel, and it will be transparent. The amount of fluid is carefully controlled to ensure that the panel will not distend excessively at high temperature. In another configuration, the second layer of the panel is an opaque absorber plate. The panel will then either absorb or reflect light as a function of temperature.
REFERENCES:
patent: 2281280 (1942-04-01), Gabor
patent: 3238296 (1966-03-01), Nelson et al.
patent: 3254342 (1966-05-01), Miller
patent: 3415591 (1968-12-01), Letter
patent: 3612653 (1971-10-01), Rajchman
patent: 3614202 (1971-10-01), Letter
Taylor, Applied Optics, vol. 11, No. 3, Mar. 1972, pp. 586-593.
Taylor, Proceedings of the IEEE, vol. 61, No. 2, Feb. 1973, pp. 148-154.
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