high altitude imaging and atmospheric data collection experiment by sabre (scientific aerospace and...
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High Altitude Imaging and Atmospheric Data Collection
Experiment
by
SABRE(Scientific Aerospace and Balloon Research Engineers)
Team Advisor: Atin SinhaTeam Leader: Ashle’ PerryTeam Member: Jeremy Robinson Team Member: Nedgby Marcelin
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Mission Goal
Acquire pressure & temperature data from sea level to stratosphere
Compare the data with that predicted by standard atmospheric model
Compare the data with the recorded value by weather balloon launched same day
Identify possible causes if any variance is observed
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33
Mission Objectives
Launch payload from the ground to about 33 km into the atmosphere
Record temperature and pressure data as well as video images
Retrieve the data for post-flight analysis
Compare the data with standard model and experimentally observed data
Make a presentation to the PACER staff
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44
Science Objectives
Verify the trend of temperature and pressure variation with altitude as predicted by standard atmospheric model
Compare the observed temperature and pressure with the recorded data in the region on the day of experiment
Determine the variation of the container surface temperature with the ambient temperature
Determine the height of the tropopause and how far it extends
Account for unexpected changes in temperature due to albedo
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55Science Requirements
Record the ambient and surface temperature from -75º C to 35º C every 15 seconds with an accuracy of 0.5º C
Record pressure from above 1000 mb to near vacuum every 15 seconds with an accuracy of 5 mb
Record time synchronized with temperature and pressure recording
Record altitude synchronized with the rest of the data
Record video images of earth’s surface extending to horizon to provide any visual clue for discrepancy in expected result
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66Standard Atmospheric Model(Temperature)
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77Standard Atmospheric Model(Pressure)
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88Summer Temperature Changes at Ft. Worth in 2009
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99
Technical Objectives
Record the temperature, and pressure data
Record video images
Build payload that can withstand the environmental conditions of the upper atmosphere (up to about 33 km), and survive landing
Stay within project financial budget
Provide power to the payload for at least 4 hours
Complete PDR, CDR, and FRR on schedule
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1010Technical Requirements
Equip the payload with two temperature and one pressure sensors to
be able to measure -75º C to 35º C and 1000 to 6 mb respectively
Provide a real time clock to time stamp the data
Install a video camera to continuously record the image
Maintain the interior temperature of the payload above -20º C
Write all information on a non-volatile memory microchip
Use sturdy, lightweight material to construct the payload so that it can survive the environmental condition of upper atmosphere and survive rough landing
Provide lightweight, inexpensive powersupply for the duration of flight (about 4 hours)
Develop and follow a detailed project management schedule to complete the project in a timely fashion and within budget
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1111
Project ActivitiesElectrical Circuit DesignSensors and Control Power SupplySoftware Design and PrototypingMechanical Design and Thermal ControlFabrication and Environmental TestingData Acquisition, Testing and Validation Launch ActivitiesPost flight Data Processing and AnalysisDocumentation and Presentation
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Mechanical Design
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Payload Design13
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Payload Design
Is a hexagonal foam structure with the following components securely mounted on a sliding partition:
BalloonSat board
Sensor board mounted piggy back
Video camera
2 Battery packs
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External structure15
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Internal Structure16
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Payload Support17
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Thermal Design
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1919
Thermal DesignDuring the course of the Balloon flight the payload is going to
travel through the Troposphere, the Tropopause, and the Stratosphere.
While traveling through these levels in the atmosphere our payload will encounter temperatures ranging from approximately -60°C to 20°C.
The payload will also have to encounter pressures ranging from approximately 100,000 pascals to 1000 pascals.
In addition our payload box will encounter small amounts of shortwave radiation, also called albedo..
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2020
Thermal Calculations
Insulation Power Surface Material Inner Outer Emissivity Conductivity Absorbtion
Thickness (m) (W)
area (m) Temp °C Temp °C (W/mK)
0.02 0 0.065aluminum
foil -18.1 -18.1 0.05 0.08 0.05
0.02 0.5 0.065aluminum
foil -1.2 -3 0.05 0.08 0.05
0.02 1 0.065aluminum
foil 14.7 11.1 0.05 0.08 0.05
0.02 1.5 0.065aluminum
foil 29.8 24.3 0.05 0.08 0.05
0.02 2 0.065aluminum
foil 44.1 36.8 0.05 0.08 0.05
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Thermal Dynamics Plot21
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Weight Table
Components Weight (g)Uncertainty
(g)
BalloonSat 69 +0
BalloonSat Battery pack 62 +1
Camera Battery Pack 43 +1
(Wires/cables/sensors/screws/boards) 15 +1
BalloonSat with extra sensor board 115 +1
Camera 106 +0
Box/insulation 98 +1
Total 508 +5
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2323
Electrical and System Design
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2424Electrical Design
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2525
Power Supply
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2626
Power Budget
Component Voltage(V) Current (mA)
Duration (H) Power (mW) Capacity (mA-hr)
BalloonSat 12 55 4 660 220Camera 5 500 3 1500 1500
Temperature Sensor
Circuitry12 4.3 4 51.6 17.2
Pressure Sensor
Circuitry12 3.7 4 44.4 14.8
Total Excluding
Camera12 63 4 756 252
Total 12563
42256 1752
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2727Power Discharge for Main Battery Pack
Discharge Plot from Kodak.com
Plot relating discharge to temperature from Kodak.com
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2828
Power Discharge for Camera Battery Pack
Discharge Plot from Energizer.com
― Room Temperature ― 0ºC ― -21ºC
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2929Sensor Circuit Board Board
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3030
Software Design
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3131Data Event FormattingDescription Data type size(bits) size(byte)10's of months Nibble 4 0.5
1's of months Nibble 4 0.5
10's of dates Nibble 4 0.5
1's of dates Nibble 4 0.5
10's of hours Nibble 4 0.5
1's of hours Nibble 4 0.5
10's of minutes Nibble 4 0.5
1's of minutes Nibble 4 0.5
10's of seconds Nibble 4 0.5
1's of seconds Nibble 4 0.5
Pressure sensor Byte 8 1
Temperaturesensor A Byte 8 1
Temperaturesensor B Byte 8 1
TOTAL N/A 64 8
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3232
Flight Software
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System Testing Results
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3434
Vacuum Testing
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3535
Thermal Testing
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3636
Shock Testing
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3737
Calibrations
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3838Pressure Sensor Calibration
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3939Temperature Sensor A Calibration
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4040
Temperature Sensor B Calibration
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4141
Data Acquisition and Analysis Plan
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4242Ground Software Implementation and
Verification
BASIC Stamp programming software
Term 232 software
Microsoft Media Player software
Microsoft Notepad software
Graphical Analysis software
Microsoft Excel software
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Data Analysis
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Flight Profile
05000
1000015000200002500030000350004000045000500005500060000650007000075000800008500090000
0:00:00 0:28:48 0:57:36 1:26:24 1:55:12 2:24:00
Flight Time (H:M:S)
Alt
itu
de
(ft
)
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Pressure Profile
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0 20000 40000 60000 80000 100000
Altitude (ft)
Am
bie
nt
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ssu
re (
mb
)
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Comparison of Temperature (Ascent vs. Descent)
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-80 -60 -40 -20 0 20 40
Temperature (Deg C)
Alt
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(ft)
Ascent Descent
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Comparison of Balloon Data with Ft. Worth Data and Standard Atmospheric Data
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-80.0 -70.0 -60.0 -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 20.0 30.0 40.0
Temperature (Deg C)
Alti
tude
(m)
Standard Atmosphere Ft. Worth Data Balloon Data
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49Comparison of Balloon Data with Ft. Worth and Standard Atmospheric Data
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Standard Atmosphere Ft. Worth Data Balloon Data
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5050Team SABRE: Albany State University
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51
Questions ???