Deep Concentric Grooves Enhance Blackbody Spectral And Spatial Uniformity

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Abstract
A blackbody calibration source designed for operation in a vacuum uses cryogenic coolant and a four-stage controller to provide 0.01 K stability over an operating range from 150 to 350 K, with an absolute uncertainty of less than 0.2 K. The blackbody radiator consists of a black anodized aluminum disk into which is cut concentric grooves that provide a cavity-like enhancement of the blackbody emittance. A gold-plated, temperature-controlled conical reflector with a 5-in. diameter aperture extends the apparent size of the blackbody so that sensors with wide fields of view up to 175 deg conical can be calibrated. A minicomputer-based temperature measurement system converts an embedded array of platinum resistance thermometer (PRT) resistance measurements (traceable to IPTS-68) into blackbody temperature and then calculates the radiant exitance. Data is presented from modeling predictions and actual performance measured during calibration of the ERBE instruments.© (1983) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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