Deep Concentric Grooves Enhance Blackbody Spectral And Spatial Uniformity

Stephen L. Carman

doi:10.1117/12.935934

22 September 1983 Deep Concentric Grooves Enhance Blackbody Spectral And Spatial Uniformity

Stephen L. Carman

Proceedings Volume 0416, Applications of Optical Metrology: Techniques and Measurements II; (1983) https://doi.org/10.1117/12.935934
Event: 1983 Technical Symposium East, 1983, Arlington, United States

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.

Citation Download Citation

Stephen L. Carman "Deep Concentric Grooves Enhance Blackbody Spectral And Spatial Uniformity", Proc. SPIE 0416, Applications of Optical Metrology: Techniques and Measurements II, (22 September 1983); https://doi.org/10.1117/12.935934

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