Indium-Tin Oxide Sensors Measuring Atmospheric Ozone 1 of 25

General The primary goal of the ITO sensor project is to measure the concentration of Ozone (O 3 ) as a function of altitude. The concentration of these gases will specify the current situation of ozone depletion. These measurements will be compared to past measurements made by other payloads. 2 of 25

Science The measurement from the sensors depend greatly on temperature conditions, which must remain relatively constant (24 – 30 deg C). The obtained measurements are compared with various experiments showing the precise concentration of Ozone. Indium-Tin Oxide Sensors have been chosen for this flight. 3 of 25

Technical The concentration of Ozone is calculated as the function of voltage produced across the sensor. As the resistance in the ITO sensor varies with the concentration of these gases, different voltages are produced with the same amount of input current in the circuit board. The Real Time Clock will be utilized as a counter and a timestamp will be printed for each measurement so that it can be related by time to altitude. 4 of 25

System Design 6 of 25

Electrical Design and Development Sensors/Sensor Interfacing Control Electronics Power Supply Power Budget 5 of 25

Sensors/Sensor Interfacing 7 of 25

Control Electronics BalloonSAT 8 of 25

Kapton Heater 9 of 25

Power Supply 10 of 25

Power Budget 11 of 25

Software Design Data Format and Storage Flight Software 12 of 25

Data Format and Storage EEPROM will store all data collected on flight EEPROM stores addresses for flight software 13 of 25

Flight Software Read “original address” from EEPROM Address $0000 Read RTC –3 bytes Read all ITO sensors and Thermistor –9 bytes Store all data from reading Store current address in EEPROM Address $0000 Repeat loop until current address equals 8170 –( current_address = original_address) –LED flashes once per second 14 of 25

Thermal Design ITO Sensors must maintain temperatures between 24 and 30 degrees Celsius Kapton Heater Requires approximately 1W 16 of 25

Mechanical Design A hollow regular hexagonal prismA hollow regular hexagonal prism FOAMULAR Insulating SheathingFOAMULAR Insulating Sheathing External Design: Each side of the base = 94 mmEach side of the base = 94 mm The height of the prism = 193 mmThe height of the prism = 193 mm 51mm X 49mm rectangular hole for the ITO sensor51mm X 49mm rectangular hole for the ITO sensor The ITO sensor attached from the inner walls; minimal area of the ITO sensor is exposedThe ITO sensor attached from the inner walls; minimal area of the ITO sensor is exposed The external design of ITO sensor payload (in m) 17 of 25

Internal Design: Rectangular- shaped foam (thickness = 18 mm) bisects the internal payload in two –Heater Batteries, Heater, ITO sensors, BalloonSat –BalloonSat Batteries, Sensor Interfacing Board Kapton Heater attached to the back of the sensor with thermal paste Internal Divider with BalloonSAT (in m) 18 of 25

a) Side where ITO sensor is attached (in m) b) Side where ITO sensor is attached with ITO sensor (in m) 19 of 25

Weight Budget: Balloon payload should be less that 500 g Density of The FOAMULAR Insulating Sheathing =.029 g/ cm 3 S.N. ComponentsWeight (gram)Clearance (g) 1.BalloonSAT60+/- 5 2.FOAMULAR Insulating Sheathing110+/ Power Supply (Battery)240+/ ITO sensor and PCB70+/- 5 5.Components for Sensor Interface15*+/ Mass of cable for ITO sensor Kapton Heater/Thermistor Tape, Glue and other structure 15* 10* +/- 5 0 Total: /- 50 * Approximated within 0.1g 20 of 25

Calibrations 21 of 25

Calibrations

Ground Software Save into text file Use Microsoft Excel Algorithms pre-programmed 22 of 25

Risk Management 23 of 25 PROBABILITYPROBABILITY SEVERITY

Special Thanks 25 of 25