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A High-Resolution Measurement of Ball IR Black Paint's Low-Temperature EmissivityHigh-emissivity paints are commonly used on thermal control system components. The total hemispheric emissivity values of such paints are typically high (nearly 1) at temperatures above about 100 Kelvin, but they drop off steeply at lower temperatures. A precise knowledge of this temperature-dependence is critical to designing passively-cooled components with low operating temperatures. Notable examples are the coatings on thermal radiators used to cool space-flight instruments to temperatures below 40 Kelvin. Past measurements of low-temperature paint emissivity have been challenging, often requiring large thermal chambers and typically producing data with high uncertainties below about 100 Kelvin. We describe a relatively inexpensive method of performing high-resolution emissivity measurements in a small cryostat. We present the results of such a measurement on Ball InfraRed BlackTM(BIRBTM), a proprietary surface coating produced by Ball Aerospace and Technologies Corp (BATC), which is used in spaceflight applications. We also describe a thermal model used in the error analysis.
Document ID
20180000042
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Tuttle, Jim (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Canavan, Ed (NASA Goddard Space Flight Center Greenbelt, MD, United States)
DiPirro, Mike (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Li, Xiaoyi (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Franck, Randy (Ball Aerospace and Technologies Corp. Boulder, CO, United States)
Green, Dan (Ball Aerospace and Technologies Corp. Boulder, CO, United States)
Date Acquired
January 3, 2018
Publication Date
June 13, 2011
Subject Category
Engineering (General)
Instrumentation And Photography
Report/Patent Number
LEGNEW-OLDGSFC-GSFC-LN-1042
Meeting Information
Meeting: Cryogenic Engineering Conference and International Cryogenic Materials Conference
Location: Spokane, WA
Country: United States
Start Date: June 13, 2011
End Date: June 17, 2011
Sponsors: ATI Wah Chang
Distribution Limits
Public
Copyright
Public Use Permitted.

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