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Mars Sunphotometer Group

Mars Sunphotometer Group. Industry Advisor: Dr. Strawa Advisor: Dr. Papadopoulos Student Team Lead: Matthew Velante. Agenda. Current Objectives Timeline Technical Reports Website Future Objectives Team Members Team Structure Discussion. Current Objectives. Fast work pace.

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Mars Sunphotometer Group

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  1. Mars Sunphotometer Group Industry Advisor: Dr. Strawa Advisor: Dr. Papadopoulos Student Team Lead: Matthew Velante

  2. Agenda • Current Objectives • Timeline • Technical Reports • Website • Future Objectives • Team Members • Team Structure • Discussion

  3. Current Objectives • Fast work pace. • Completion of technical research within one week. Items required: • Equations • Formulae • Physics

  4. Timeline

  5. Technical Reports • Wavelength • Winston Cone/Ray Tracing • Dispersion Technique • CCD

  6. Wavelength: Objectives: • Determine which chemicals sunphotometer should recognize • Research spectra of chemicals of interest • Investigate necessary abilities of CCD array • Investigate alternative designs of sunphotometer

  7. Important Elements of the Martian Atmosphere Atmospheric composition (by volume): Major : Carbon Dioxide (CO2) - 95.32% ; Nitrogen (N2) - 2.7% Argon (Ar) - 1.6%; Oxygen (O2) - 0.13%; Carbon Monoxide (CO) - 0.08% Minor (ppm): Water (H2O) - 210; Nitrogen Oxide (NO) - 100; Neon (Ne) - 2.5; Hydrogen-Deuterium-Oxygen (HDO) - 0.85; Krypton (Kr) - 0.3; Xenon (Xe) - 0.08

  8. Past Experimentation • Whiting- Determination of Mars Atmospheric Composition

  9. “The Right Tool for the Job” • Expected spectra and conditions on mars will determine the necessary attributes of a CCD array for the sunphotometer • The array must meet conditions for: pixel size light sensitivity operating conditions physical size and accuracy • Array should be lightweight, durable, and draw as little power as possible

  10. Other Design Possibilities • Another possibility for a hemispherical viewing devise might be a reflecting cone.

  11. Winston Cone Design Source:http//scienceworld.wolfram.com/physics/WinstonCone.html

  12. Initial Parameters • Entrance Aperture of 2.00 mm • Ray angle range from zenith 18-89 degrees

  13. Winston Cone Equations Winston Cone Equation in (r , z) coordinates: Inverting the Equation: Dimension equation: = =

  14. Dimensions • Entrance Aperture radius: 1.00 mm • Exit Aperture radius: 3.236 mm • Cone Height: 13.037 mm • Focal Length: 1.309 mm Note: All dimensions are based on 2.00 mm aperture size and 18 degrees off the zenith inclination.

  15. Concerns • Size of Cone • Manufacturing • Interface (CCD)

  16. Dispersion Technique • Matt and Chris C. have just been assigned to this task.

  17. CCD • 2-D array is chosen as the incident light moves across the sky, the dispersed spectrum moves across the array area. • Using the determined wavelength spectra, the CCD material will be determined.

  18. CCD • Important Detector Parameters

  19. CCD • Equations:

  20. Website • Current Website: http://groups.yahoo.com/group/MARS-SunPhotometer-Team/ • Future Website: • http://www.engr.sjsu.edu/cest-e/Mars_Sunphotometer

  21. Future Objectives • Submit proposal for NASA Ames DDF. • Minimum of two publications to be produced (for AIAA, JANNAF, …)

  22. Team Structure Advisors/Mentors Team Leader Team Members Tasks Research Design Integration

  23. Team Members • Dr. Strawa – Industry Mentor/Advisor • Dr. Papadopoulos - Mentor/Advisor • Matt – Student Team Leader • Student Team Members: Eric, Justin, Dan, Bao, Christian, Shabana, Chris C., Mike

  24. Discussion • Status: NASA Ames Director’s Discretionary Fund?

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