- Conference date: 29 August-2 September 2005
- Location: Keystone, Colorado (USA)
An experiment has been designed, fabricated, and conducted to measure emissivity of clean and contaminated metallic surfaces at temperatures between 25 K and 35 K. Samples of silver‐plated copper with a total surface area of 0.25 m2 are secured to the coldhead of a single stage cryocooler and enclosed within an effective black thermal shield, which has an effective emissivity of 0.95 and temperatures between 275 K and 280 K. From error analysis, a sample with an emissivity of 0.020 had an experimental error between +/− 0.001 and +/− 0.002. From measurement of the radiation heat transfer, the emissivity at 30 K was 45% of the emissivity that was measured at 300 K for a set of silver‐plated copper samples. In addition, 110 μg of water vapor was sufficient to increase the emissivity of the silver‐plated copper between 50% and 200%.
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