Abstract
Conventional radiation pyrometers, when used for solar furnace measurements, are subject to large errors due to reflected solar radiation. A spectral separation technique of differentiating between emitted and reflected radiation is discussed. In this method the pyrometer is designed to respond to wavelengths absent from the solar spectrum due to atmospheric absorption. This paper discusses the relative advantages of using the ultraviolet and infrared atmospheric absorption bands and describes a working pyrometer, that is responsive to a narrow band of wavelengths centered at 2.8 microns. This band corresponds to a water-vapor and carbondioxide absorption band in the solar spectrum. Although the pyrometer has certain disadvantages it does over-come the central problem in temperature measurements of solar furnaces.
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