2016/10/04 by Tomáš Králı́k, P. Hanzelka, Kralik, Tomas +5
Engineering · #Advanced Thermodynamic Systems and Engines #FOS: Physical sciences #Heat Transfer and Optimization #Instrumentation and Detectors (physics.ins-det) #J.2 #Spacecraft and Cryogenic Technologies
paper · pdf · doi:10.48550/arxiv.1610.00967
openalex publication_date 2016/10/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In the described device, the thermal emissivity or absorptivity of the sample is measured by substitution of the radiative heat flow between two parallel surfaces by thermal output of a heater. Fast measurements of the mutual emissivity for the range of the temperature of the radiating surface 25 K-150 K are possible. The absorbing surface has a temperature between 5 K and 10 K when LHe is used as cryoliquid. The desired measurement sensitivity is 1 mK for temperature and 0.1 μW for heat power, respectively. The diameter of the whole device is 50 mm and so it is possible to use a commercial dewar can for the cooling. The form of the sample is a round plate 40 mm in diameter and 1 mm in thickness with one tested side. The emissivity and its temperature dependency for various surface treatments can be checked immediately before application in a cryogenic system.