Browsing by Author "Diaz, Ernesto"
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Item Progress Report on the Spacecraft Atmosphere Monitor Development Model(47th International Conference on Environmental Systems, 2017-07-16) Madzunkov, Stojan; Darrach, Murray; Kidd, Richard; Schaefer, Rembrandt; Simcic, Jurij; Nikolic, Dragan; Diaz, Ernesto; Homer, Margie; Schowalter, Steven; Bae, Byunghoon; Gill, JohnThe Spacecraft Atmosphere Monitor (S.A.M.) is a miniature gas chromatograph (GC) mass spectrometer (MS) intended for assessing trace volatile organic compounds and the major constituents in the atmosphere of present and future crewed spacecraft. As such, SAM will continuously sample concentrations of major air constituents (CH4, H2O, N2, O2, and CO2) and report results in two-second intervals. The S.A.M. is a technology demonstration planned to launch in 2018 and we report here on recent developments taking place in building a testbed and development model of the instrument. The S.A.M. is mechanically designed to operate under hi-G loads present during launch events and can operate at sub-atmospheric pressures relevant to extra-vehicular activities. Total instrument mass is projected at 9.5 kg with power consumption estimated at 35 W. The S.A.M. instrument will provide on-demand reporting on trace volatile organic compounds (VOC) at ppm to ppb levels of 40+ species relevant for astronaut health.Item The Technology Demonstration of the Spacecraft Atmosphere Monitor(49th International Conference on Environmental Systems, 2019-07-07) Schowalter, Steven; Madzunkov, Stojan; Darrach, Murray; Diaz, Ernesto; Moore, Brad; Simcic, Jurij; Nikolic, Dragan; Bae, ByunghoonThe Spacecraft Atmosphere Monitor (S.A.M.) is a miniaturized Gas Chromatograph Mass Spectrometer (GC/MS) instrument being sent to the International Space Station (ISS) in 2019. While on-station, the S.A.M. instrument will continuously monitor the major atmospheric constituents as well as trace organic volatiles in the cabin air daily. At its core, the S.A.M. sensor consists of a quadrupole ion trap mass spectrometer (QITMS) coupled to a MEMS preconcentrator, gas chromatograph, and microvalve system. Its miniature, ruggedized form factor allows the S.A.M. to be aisle-deployed throughout different nodes of the ISS to monitor different astronaut environments and activities such as exercise and sleep. The final system design of the S.A.M. flight unit, regarding the GC/MS architecture, the mechanical and electrical assembly, and the software implementation, will be discussed in detail and the S.A.M. flight unit performance will be presented.Item Update on the Spacecraft Atmosphere Monitor Technology Demonstration Project(2020 International Conference on Environmental Systems, 2020-07-31) Darrach, Murray; Madzunkov, Stojan; Kidd, Richard; Bae, Byunghoon; Zhong, Fang; Simcic, Jurij; Malone, Charles; Belousov, Anton; Belousov, Anton; Maiwald, Frank; Gonzales, Marianne; Homer, Margie; Diaz, Ernesto; Moore, Bradley; Nikolic, Dragan; Purcell, Richard; Oyake, Amalaye; Tillmans, Tina; Reichenbach, KelseyWe report on the scientific and engineering progress for the second technology demonstration unit (TDU2) of the Spacecraft Atmosphere Monitor (S.A.M.). The S.A.M. TDU2 is a compact gas chromatograph mass spectrometer (GCMS) for monitoring both the trace volatile organics and the major constituents in the astronaut cabin atmosphere. Progress on the micro electro-mechanical systems (MEMS) gas chromatograph is detailed, showing sensitivity and selectivity of the TDU2 analytical measurements. The TDU2 capabilities for monitoring the cabin air major constituents is also detailed, highlighting improvements from the first S.A.M. TDU instrument.