Team SSCSCCritical Design Review

Nick Brennan, Kier Fortier, Tom Johnson, Shannon Martin, Dylan Stewart, and Adam Wright

October 05, 2010

Fall 2010 R

ev A

08-23-10

Mission Overview-This experiment is designed to

detect the presence of the ozone layer in the stratosphere by analyzing sound amplitude.

-Group O2n 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

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.

RequirementsLevel 0 requirementsConstruct 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

Level 1 RequirementsMeasure 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

Level 1 requirements continued

Obtain oxygen level data from group O2n Cloud Nine, analyze side by side with sound level data

Ensure the safety of all team members and classmates

DesignDesign

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.

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

PartsHave received all parts that we ordered- SOMO, Extech,

SpeakersNeed 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

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.

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

Test PlanStructural 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

Hardware testingCamera Test

Camera will be placed in satellite and turned onWill be allowed to take pictures for 2 hoursWill be plugged into computer and analyzed

HOBO TestHOBO 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

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 flightFirst 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 recordedThis 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

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 placeAfter the 2 hours the sound datalogger will be

connected to the computerThis 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

Expected ResultsExpected: 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

Biggest Worries…

Electronics, soldering

Method of starting the Extech Level Logger