Abstract
Various optical systems are discussed with reference to their use with carbon arc image furnaces. A new optical system which employs two elliptical mirrors is described and shown to have numerous practical advantages. Using modifications of motion picture projection lamps, measurements have been made of carbon arc image furnaces ranging up to more than 26-kw power input, producing approximately 3000-watts radiant flux at the image within a circular area of 30 mm diameter, with a center of image irradiance as high as 15 watts per mm2, a flux density equivalent to the radiation from a blackbody at more than 4000°K. Furnaces of lower output and higher efficiency are also described. Comparison with available data indicates carbon arc image furnace performance is essentially equivalent to existing solar furnaces in the 60 to 100-in. diameter range. Possibilities for further improvement of carbon arc image furnaces are also considered.
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