Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..684.1121b&link_type=abstract
TEMPERATURE: Its Measurement and Control in Science and Industry; Volume VII; Eighth Temperature Symposium. AIP Conference Proc
Other
Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment, Astronomical And Space-Research Instrumentation
Scientific paper
The Mars Electrostatic Chamber (MEC) was designed to provide for research and testing relative to future missions to Mars. Environmental characteristics of Mars were emulated, including pressure, atmospheric composition, and temperature. Existing and newly acquired hardware were integrated with a centralized controller to bring about successful near-autonomous operation and temperature control. The MEC is principally comprised of systems that control atmospheric pressure, atmospheric content, and chamber temperature. The temperature control system is used to replicate temperatures within actual minimum and maximum values as would be experienced on Mars. Cryogenic liquid/gaseous nitrogen supplies as well as various heating techniques were used to obtain this temperature range. Fundamental to the stabilization of temperature within the chamber was the instrumentation of multiple temperature measurements and optimal control of extremely cold nitrogen. Through testing and characterization, cooling design modifications, and controller instrumentation revisions, the cryogenic supply was successfully throttled by a programmable controller system with appropriate programming. Stable temperature control was ultimately achieved and automated diurnal cycling provided.
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