An experimental program to measure the mass flux in the backflow region of a 5-lbf bipropellant thruster at angles up to 147 deg with respect to the plume centerline using temperature-controlled and temperature-compensated quartz crystal microbalances (QCM'S) is presented. The measurements were conducted in a high vacuum cryogenic chamber (Aerospace Chamber 10V) at AEDC. Gaseous helium and liquid helium cryopanels provided a blank-off pressure in the ten to the minus ...
Thin film radiation thermopiles promise substantial improvement in detector performance and construction cost over conventional solid-wire thermopiles when used in space simulation chambers for measuring simulated solar total irradiance. Three types of substrates were used during the investigation of thin film construction techniques: (1) aluminum foil suspended over a channel cut in the heat sink, (2) thin Mylar suspended over a channel cut in the heat sink, and (3) the ...
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