Remote Atmospheric Sensing Device Team UNO

Donald Swart Donald Swart Cindy Gravois Cindy Gravois René Langlois René Langlois UNO Advisor Lawrence Blanchard Lawrence Blanchard

Objectives Using the measurable quantities of UV intensity: Using the measurable quantities of UV intensity: Measure total column thickness of the ozone layerMeasure total column thickness of the ozone layer Measure relative ozone concentration as a function of altitudeMeasure relative ozone concentration as a function of altitude Measure UVB and UVC as it is transmitted and attenuated through the stratosphere Measure UVB and UVC as it is transmitted and attenuated through the stratosphere

Expected Results  Flight profile:  0 to 30km  Approximately 90 minute flight  Increasing UV intensity with increasing altitude  Largest change at about 15km  The curve shown on this graph represents ozone density as a function of altitude  Using ozone coverage estimates for the area of Palestine, TX provided by NOAA and taken over the last 3 years during this week we should see about 320 DU of ozone coverage.

Failure to Launch Lack of proper program code Lack of proper program code Programmer quit without warning or writing codeProgrammer quit without warning or writing code Progress reports were falsifiedProgress reports were falsified Processor Damaged Processor Damaged Insufficient time to rework an entirely new circuit design Insufficient time to rework an entirely new circuit design

Electrical Design Detector Array Detector Array Filtered Photo diodesFiltered Photo diodes Dark Current CompensationDark Current Compensation Controller Controller PIC16F917PIC16F Kb FRAM units8 16 Kb FRAM units Pressure Detection Pressure Detection Temperature Detection/Regulation Temperature Detection/Regulation

New Electrical Design BalloonSAT BalloonSAT 2 bad BalloonSAT boards before good board found2 bad BalloonSAT boards before good board found Required team members to learn a new programming language in less than a dayRequired team members to learn a new programming language in less than a day Voltage regulator broke off during final testingVoltage regulator broke off during final testing Advantage: greater on board memoryAdvantage: greater on board memory

Mechanical Design  Box  8x6x5 inches  Allows space for all components  Reflective tape to prevent overheating  Insulation  Styrofoam sheets  1 inch of exterior foam retains heat  Provides support for inner electronics

New Mechanical Design Outer box size unchanged Outer box size unchanged Inner box had to be adjusted to accommodate a completely new circuit Inner box had to be adjusted to accommodate a completely new circuit Wasted mass due to insufficient time to reduce box size Wasted mass due to insufficient time to reduce box size Advantage: more insulation Advantage: more insulation

Power System  Main Payload and Diodes  Energizer CR 2025 batteries  3 V, 170 mAh each  Heater  Energizer CR 2025 batteries  Stacked to provide 6V  CR 2025 are very lightweight  9 total used, less mass than standard 9 V battery  Can last 5 hours with a constant draw of 30 mA

New Power Design BalloonSAT required 9V input and had a greater current draw than PIC BalloonSAT required 9V input and had a greater current draw than PIC 2 9V batteries were used which consumed more mass than original power system 2 9V batteries were used which consumed more mass than original power system

Final Conclusions Forced use of completely new circuit design Forced use of completely new circuit design Lack of adequate programming for PICLack of adequate programming for PIC Lost time for proper testing Lost time for proper testing Short circuited PICShort circuited PIC Not found sooner due to misinformation from a faculty advisor Not found sooner due to misinformation from a faculty advisor Lack of time for overall testing in new circuit Lack of time for overall testing in new circuit

Lessons Learned More thorough progress reporting steps More thorough progress reporting steps More team communication More team communication Common working times and locationsCommon working times and locations Cross training on all aspects of essential payload design and processesCross training on all aspects of essential payload design and processes i.e. in the event of loss of the programmer i.e. in the event of loss of the programmer Greater emphasis on cross training Greater emphasis on cross training

Acknowledgements LACES LACES Dr. Brad EllisonDr. Brad Ellison Dr. Greg GuzikDr. Greg Guzik Stennis Space Center Stennis Space Center Lester LangfordLester Langford UNO UNO Dr. Greg SeabDr. Greg Seab Dr. Terry ReamerDr. Terry Reamer Dr. Edit BourgeoisDr. Edit Bourgeois Dr. AzzamDr. Azzam