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Colorado Space Grant Consortium DemoSat-B Colorado State University

Critical Design Review. Colorado Space Grant Consortium DemoSat-B Colorado State University Matthew Jui, Ian Patterson, Mark Spowart, Todd Wallis June 8 2011. Overview. The payload for the CSU DemoSat-B 2011 project is a ‘CO 2 mapping with respect to altitude

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Colorado Space Grant Consortium DemoSat-B Colorado State University

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  1. Critical Design Review Colorado Space Grant Consortium DemoSat-B Colorado State University Matthew Jui, Ian Patterson, Mark Spowart, Todd Wallis June 8 2011

  2. Overview The payload for the CSU DemoSat-B 2011 project is a ‘CO2mapping with respect to altitude System’, C-MAS. This payload will measure concentrations of carbon dioxide in the atmosphere throughout its flight and then will be matched with corresponding altitudes upon recovery. Although weather balloons with similar measuring equipment are launched daily, what makes C-MAS unique is that the data that is taken is done so at a much higher altitude and at a lower cost, while still maintaining a high level of accuracy. • Objectives • Payload will measure concentration of CO2 ,RH, temperature and pressure at intermittent altitudes • Payload will operate by itself for 200 minutes and take data for both ascent and descent • Optional Objectives • Payload will visually record weather conditions through an attached camera or video camera • Topic Background • Multiple organizations have conducted similar research but with different techniques. (sample from aircraft, and Space observation)

  3. CO2 concentrations in our atmosphere • CO2 concentrations are cyclical • but are increasing by about 2 ppm/yr. • Current CO2 concentration at sea level is 394.4ppm • Although this is a relatively small overall • concentration, it is an important component of the • earth’s atmosphere because it emits and absorbs • infrared radiation at wavelengths that play a • significant role in the greenhouse gas effect • A peak in annual concentration levels happens in • Spring when plants are in full bloom • In July we expect to see relatively constant • concentrations throughout the atmosphere

  4. Schematic of major Internal Components

  5. Concept of Operation • Pump provides volumetric sample air flow through system • Heater brings sample air temp to w/ in sensor operating temp • CO2 meter measures CO2 concentrations, RH, Temp • Data logger saves all data including external pressure sensor

  6. Mission Requirements Matrix

  7. Electronics Schematics

  8. Flow Chart Block Diagram

  9. Structural Drawings

  10. Subsystems Overview • Power Subsystem • Battery must stay between 32 and 140 F during all operation • Voltage must be regulated from 7.4 to 5V depending on the circuit element • Air Flow Subsystem • Flow rate minimum of .3 liters per minute • No detectable leaking may occur between inlet and exit • Air must be maintained above 0 C • Heating Subsystem • Must maintain both air flow and power subsystem heat requirements • Sensor Subsystem • Must take accurate measurements of both CO2 concentration and internal pressure

  11. Parts List

  12. Test Plans

  13. Bubble Test Used to measure volumetric flow rate

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