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PHAT-TACO ExperimentOn board ACES-23
Hannah Gardiner, Bill Freeman, Randy Dupuis, Corey Myers, Andrea Spring
Science PresentationTeam Philosohook
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Science Presentation
1. Goals and objectives2. Science background 3. Mechanical Design4. Electrical Design5. Testing6. Calibrations7. Results
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Mission Goal
• To study the layers of the atmosphere using an instrumented sounding balloon flown in East Texas during May and to analyze the balloon and the environment surrounding the payload in order to study the relationship between the temperature and humidity profiles acquired during flight.
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Objective
• The overall objective is to measure and record humidity, pressure, and internal and external temperature on a sounding balloon flight while taking video of the flight.
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SCIENCE BACKGROUND
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Science Background: Earth’s Atmosphere
• • Troposphere– Clouds
• Stratosphere– Less humidity &
lower pressure than the Troposphere
http://www.wyckoffschools.org/eisenhower/teachers/chen/atmosphere/earthatmosphere.htm
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US Model Atmosphere1 1976
• “A hypothetical vertical distribution of atmospheric temperature, pressure, and density”
• Can calculate properties of the atmosphere– Pressure– Temperature– Density
1U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C., 1976.
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Balloon Radius
• Kaymont 3000 gm sounding balloon
• Ascent rate should be constant during flight
• Has not been in previous flights
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Local Area
Regional Area
Our Flight Path
Palestine to Rusk
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MECHANICAL DESIGN
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Mechanical Drawings - ExternalTop
Front
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Mechanical Design - Internal
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Mechanical Design - Internal
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ELECTRONICS DESIGN
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Temperature Sensor Interface
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Pressure Sensor Interface
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Humidity Sensor Interface
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Camera Interface
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FLIGHT OPERATIONS: TESTING
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Thermal Test
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Thermal Test: Internal and External Temperature
External Temperature (C)Internal Temperture (C)
Time (Minute)
Tem
pert
ure
(C°)
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Vacuum Test
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Shock Test
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Shock Test
intempouttemppreshumiditycam
Time (Seconds, 30 before and after drop)
ADC
Coun
ts
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FLIGHT OPERATIONS: CALIBRATIONS
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Temperature Calibration
External temperature sensor: Temperature(C°) = -.4439(ADC Count) + 28.3Error: ((.013151*ADC Count)^2+(.917709)^2)^.5 C°
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Temperature Calibration
Internal temperature sensor: Temperature(C°) = 1.5648(ADC Count) - 364.2Error: 2.07 C° (error variation because of ADC Counts is very small)
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Pressure Calibration
Pressure
Counts
Pressure Sensor:Pressure(Atm)=.0039464(ADC counts)-.002953703Error=((1.98378e-5*ADC counts)^2+(.002055339)^2)^.5 Atm
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Humidity Calibration
Humidity
Counts
Humidity Sensor:RH(%)= 0.4003(ADC count) – .1047Error: ((0.01453*ADC count)^2+(2.706038)^2)^.5%
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RESULTS
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Internal Temper-ature Ascent
Internal Temper-ature Descent
Altitude (km)
Temperature (°C)
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External Tem-perature Ascent
External Tem-perature De-scent
Altitude (km)
Temperature (°C)
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-9-8-7-6-5-4-3-2-10123456789
10
Ascent Lapse Rate vs Altitude
Altitude [km]
LapseRate
[C/km]
Lapse rate averaged over one kilometer
RED line is the expected value from US standard atmosphere
Tropopause begin13.6 km (44600 ft.)
Tropopause end18 km (59000 ft)
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External Temperature in the Tropopause (13-20 km)
Tropopause Ascent
Tropopause Descent
Altitude (km)
External Tem-perature
(°C)
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NOAA Data Noon 5/24Temperature vs Altitude
Altitude (km)
Temperature (°C)
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0 5 10 15 20 25 30 350
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Pressure Ascent
Pressure Descent
Altitude (km)
Pressure (mbar)
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NOAA Data Noon 5/24Pressure vs Altitude
Altitude (km)
Pressurembar
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Clouds
• Passed through 3 clouds– Ascent– 1.02 to 1.14 km (3363 to 3763 feet)– 1.18 to 1.23 km (3863 to 4043 feet)
– Descent– 0.86 to 0.66 km (2837 to 2150 feet)
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Humidity Ascent
Humidity Descent
Altitude (km)
Humidity (%rel)
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Humidity Difference?
• 10% difference in humidity between ascent and descent
• 20 km mark on ascent and descent
• 1 km difference• 37.5 minute
difference
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Humidity Information for the First/Last 11 km
Humidity First 10 km
Humidity Last 10 km
Altitude (km)
Humidity (%rel)
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NOAA Data Noon 5/24Humidity vs Altitude
Altitude (km)
Humidity (%rel)
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f(x) = 0.00902191299 x³ + 0.043658215562 x² + 4.69312331995 x + 147.340553136R² = 0.997416409913255
Radius vs altitude
Altitude [km]
Radius[cm]