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##### Presentation Transcript

1. Space Cadets Temperature, Pressure, Humidity & Imaging Ali Javed Ravneet Singh Brock Couvillion Dean Slama

2. OBJECTIVES • To fly a balloon payload up to an altitude of 100,000 ft to photograph, measure, and record temperature, pressure, and humidity • Identify trends at various atmospheric layers.

3. MISSION GOALS • Study the relationships between the temperature, pressure, humidity, and altitude ranging from 0 to 100000 ft in an effort to identify trends at various layers of the atmosphere using a balloon payload. • Launched from Palestine, Tx.

4. Science Objectives • Determine the variability in temperature with altitude. • Determine the variability in pressure with altitude. • Determine the variability in humidity with altitude. • Determine, from previously recorded data, how often to record the data.

5. Outline: • Science Background • Ravneet (Temperature/Pressure) • Ali (Humidity/Imaging) • Technical Background • Brock (Overview/requirements) • Dean (Specific Sensors)

6. Temperature/Pressure(Ravneet Singh)

7. Five Layers of Atmosphere • Troposphere • Sea level to 15 km, temperature range: up to -60 °C. • Stratosphere • 15 to 50 km, temperature range: -60 °C to ~ 0 °C. • Mesosphere • 50 to 80 km , temperature range: up to -90 °C. • Thermosphere • 80 to 690 km, temperature range: greater than 1200 °C • Exosphere • Up to 10000 km

8. Pressure • Pressure decreases exponentially with altitude • At sea level, the pressure is, on average, 1013 mb.

9. Data Collected from Ft. Worth, TX

10. Sampling Rate • The temperature decreases as 0.0061 °C/m in troposphere. With balloon payload ascending at 1000 ft/min, which is 304.8 m/min, change in temperature is 1.08 °C/35sec. Approximately 1 °C of change happens every 35 sec, so the sampling rate does not have to be less than 1 sample/35 sec . • The 1 hPa of change in pressure occurs in less than 40 ms.

11. Humidity/Imaging(Ali Javed)

12. HUMIDITY • Amount of moisture the air can hold before it rains. • The most it can hold is 100 percent. • It is measured by a Humidity Sensors ,which indicates the amount of water in the air at any one temperature. • For our mission, we will use a Capacitive Humidity Sensors.

13. HUMIDITY • During the day near the surface, particularly with clear skies, humidity usually decreases with height. • We can verify this trend by looking at Graph 1.

14. HUMIDITY VS HEIGHT

15. HUMIDITY VS HEIGHT

16. HUMIDITY VS HEIGHT

17. HUMIDITY AND DAYLIGHT • Humidity in the atmosphere changes as day turns into night, since our payload entire flight time will be during the day, this should not affect our result.

18. HUMIDITY VS GEOGRAPHY • By researching other locations, we found that geography can affect the humidity of an area.

19. 20 feet 653 FT • Areas that are elevated have a higher percentage of humidity compared to areas of lower elevation. 209 feet

20. IMAGING CHARACTERISTICS HEIGHT 3700FT

21. IMAGING CHARACTERISTICS HEIGHT 99000FT

22. IMAGING CHARACTERISTICS • Factors that can affect the photography of a region include • weather conditions • Speed of wind, • Rain.

23. DATA COLLECTION • We will measure humidity every 30 seconds. • In addition we will continuously record our flight for the entire time of the flight • which is approximately 4 hours.

24. Technical Overview & Requirements (Brock Couvillion)

25. Technical Overview • One sensor each for temperature, pressure & humidity • BalloonSat board as central CPU • Values stored on EEprom with time stamp

26. Signal to EEProm • Analog signal from sensor represents value • Op-Amps used to condition signals to values ADC can read • ADC converts analog signal to digital value • Digital Value stored in memory of EEProm

27. Requirements • Entire payload must weigh less than 500 grams • Must be able to survive landing impact & function through turbulence • Sensors must function at temperatures from -70°C to 30°C

28. Sensor Specifics(Dean Slama)

29. Measure temperature using a semiconductor temperature transducer • Range of -70 to 30 degrees Centigrade • Accuracy of +/- 3 degrees • Measure humidity using a humidity-sensitive capacitor sensor • Measure pressure using a strain-sensitive sensor • Range of 0 to 1000 millibars • Accuracy of 1 millibars • All three measurements will be taken simultaneously on intervals of 30 seconds

30. Conclusion • We plan to review our data and compare our results with our expectations. • In addition we have planned to achieve our goals in a timely manner. • We will follow a calendar and meet dead lines to finish all the required steps.