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/ 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 Team LeaderAdvisors/Mentors Tasks IntegrationResearch Team Members Design

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 Directors Discretionary Fund?