1. Team SSCSC Critical Design Review Nick Brennan, Kier Fortier, Tom Johnson, Shannon Martin, Dylan Stewart, and Adam Wright October 05, 2010 Fall 2010 Rev A 08-23-10

2. Mission Overview -This experiment is designed to detect the presence of the ozone layer in the stratosphere by analyzing sound amplitude. -Group O 2 n Cloud Nine is measuring oxygen levels -Analyze the sound level throughout the flight side by side with the oxygen level. -Ozone is trioxide heavy, therefore less oxygen levels

3. Why are we doing this? The “hole in the ozone” due to use of chlorofluorcarbons. These molecules are released into the stratosphere and break down its molecules. This test, if successful, could be implemented to ascertain the thickness of the ozone region. Data measured in different global locations or seasons could be compared with future data. If this data had dramatic changes, it could show the impact of human activity on the ozone layer.

4. Requirements Level 0 requirements Construct a BalloonSat ready for launch on 11.06.2010, able to rise to 30 km. Test the BalloonSat’s structure and hardware extensively before launch Build a system that takes data on sound levels Carry a digital camera onboard Have fun

5. Level 1 Requirements Measure sound level of frequencies ranging from 1600 to 8000 Hz. These will be played through a SOMO 14D module and recorded by an Extech level logger Take pictures of the earth rising to 30km Build a structure able to maintain atmospheric conditions up to 30 km Provide power, heat, and memory for the camera, hobo, SOMO 14D and Extech level logger Minimize weight and cost of the BalloonSat

6. Level 1 requirements continued Obtain oxygen level data from group O 2 n Cloud Nine, analyze side by side with sound level data Ensure the safety of all team members and classmates

7. Design Cube of dimensions 25.4 cm, side panel open for access to internal hardware Special Feature- 3 main “layers” to our BalloonSat Two heaters to heat the hardware This picture is just for reference.

8. 1-Sound Level Data Logger 2-Camera 3-HOBO 4-9v Batteries 5-Somo-14D 6-3v Battery 7- Heater 8-Speaker 9-Flight String

10. Parts Have received all parts that we ordered- SOMO, Extech, Speakers Need to buy this week for testing and construction: Dry Ice, Cooler, Batteries, Micro SD card Total for parts ordered: $278 Total that team will buy ~ $32

11. The total mass for our BalloonSat is within the limit of 850 grams. However, all measures to obtain maximum efficiency will be employed. Any unnecessary weight will be removed or replaced with a better solution.

12. As of now, we are on track. The team will meet in smaller groups to accomplish various individual tasks.

13. Test Plan Structural Tests: Whip Test- determine if the structure can withstand force of flight Drop Test- simulate harsh landing that BalloonSat will experience Stair Test- Simulate the fall of the BalloonSat

14. Hardware testing Camera Test Camera will be placed in satellite and turned on Will be allowed to take pictures for 2 hours Will be plugged into computer and analyzed HOBO Test HOBO will be turned on and allowed to collect data for 10 minutes During this time we will heat external temperature with our hands, breath on the humidity sensor, and heat the internal temperature with our hands again HOBO will be connected to computer and data will be checked for appropriate changes

15. Hardware Testing cont. Heater Test (done once for each heater) The heater will be let run in a closed box next to the HOBO for 1 minute The HOBO will be connected to the computer and the data will be analyzed to see if there was an increase in temperature The heater will be tested further in the cooler test Microphone and Sound Module Test The satellite will be set up just as it will be during flight First the satellite will be placed in a quiet environment and the microphone and sound module will be let run for 10 minutes This data will be analyzed to see if the correct sound is being outputted and recorded This will be repeated except with the satellite in the wind tunnel The data will be compared between the 2 tests to see how the wind in background noise will effect our data

16. Cooler Test- First Test Our satellite will be filled only with our HOBO and our 2 heaters The satellite will be placed in a cooler full of dry ice With a thermometer the outside temperature will be made to be -80 degrees Celsius After 2 hours the HOBO will be connected to the computer and checked to see if the internal temperature is kept above 10 degrees Celsius This will be repeated except with all the components of the satellite in place After the 2 hours the sound datalogger will be connected to the computer This data will be analyzed to see the effects of the cold on the sound produced and sound recorded and also to see if everything kept working in the cold temperatures

17. Expected Results Expected: Determine if sound waves can be used to locate the ozone layer To retrieve data: Upload flight data from Extech Level Logger and the HOBO for analysis. The oxygen level data will be provided by On Cloud Nine To analyze data: The software if very easy to view and organize for analysis

18. Kier Fortier -Team Leader -In charge of task delegation and planning of time -In charge of obtaining necessary materials Other Shannon Martin -Head of Documentation Dylan Stewart Head Budget Manager Science and Experimentation Adam Russell -Head of Science and Experiments Nick Brennan -Science and Experiments help Electrical Dylan Stewart -Head Electrical Engineer Tom Johnson -Electrical Engineer help Structural Tom Johnson -Head Structural Engineer Shannon Martin -Structural Engineer help Command and Data Handling Nick Brennan -Head of CD&H Adam Russell -CD&H help

19. Biggest Worries… Electronics, soldering Method of starting the Extech Level Logger