Post on 29-Mar-2015
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.
• Completion of technical research within one week. Items required:– Equations– Formulae– Physics
TimelineOctober November December January February March April May June July
ResearchWavelength
Eric, ShabanaOptics
Winston Cone ,Ray TracingChristian, Justin
Spectra DispersionScattering Device
Matt, ChrisSystem Sizing
CCDDan, Bao
Advanced ConceptsMatt
Platform ApplicationsMatt, Bao
Sensor DesignOptics - Christian, Justin
TypeSizingWeight
Scattering Device - Dan, BaoTypeSizingWeight
CCD - Dan, BaoTypeSizingWeight
IntegrationSystem Bus
StructurePowerThermal
PayloadOpticsScattering DeviceCCD
System EngineeringLead - MattAssistants - Eric, Justin
PDRCDRFDRWeekly Student Reports3rd Interplanetary Probe Workshop
Report WritingPresentation in Greece
Tasks
Technical Reports
• Wavelength
• Winston Cone/Ray Tracing
• Dispersion Technique
• CCD
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
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
Past Experimentation• Whiting-
Determination of Mars Atmospheric Composition
“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
Other Design Possibilities
• Another possibility for a hemispherical viewing devise might be a reflecting cone.
Winston Cone Design
Source:http//scienceworld.wolfram.com/physics/WinstonCone.html
Initial Parameters
• Entrance Aperture of 2.00 mm
• Ray angle range from zenith 18-89 degrees
Winston Cone Equations
=
Winston Cone Equation in (r , z) coordinates:
Inverting the Equation:
Dimension equation:
=
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.
Concerns
• Size of Cone
• Manufacturing
• Interface (CCD)
Dispersion Technique
• Matt and Chris C. have just been assigned to this task.
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.
CCD
• Important Detector Parameters
CCD
• Equations:
WA
PeaksitivityRadiantSen
HZ
AntNoiseCurre
NEP@
Website
• Current Website: http://groups.yahoo.com/group/MARS-SunPhotometer-Team/
• Future Website:• http://www.engr.sjsu.edu/cest-e/
Mars_Sunphotometer
Future Objectives
• Submit proposal for NASA Ames DDF.
• Minimum of two publications to be produced (for AIAA, JANNAF, …)
Team StructureTeam Leader Advisors/Mentors
Tasks
IntegrationResearch
Team Members
Design
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
Discussion
• Status: NASA Ames Director’s Discretionary Fund?