PHAT-TACO Experiment On board ACES-23
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PHAT-TACO Experiment On board ACES-23 Hannah Gardiner, Bill Freeman, Randy Dupuis, Corey Myers, Andrea Spring Science Presentation Team Philosohook
description
Science Presentation. Team Philosohook. PHAT-TACO Experiment On board ACES-23 Hannah Gardiner, Bill Freeman, Randy Dupuis, Corey Myers, Andrea Spring. Science Presentation. Goals and objectives Science background Mechanical Design Electrical Design Testing Calibrations Results . - PowerPoint PPT Presentation
Transcript of PHAT-TACO Experiment On board ACES-23
PHAT-TACO ExperimentOn board ACES-23
Hannah Gardiner, Bill Freeman, Randy Dupuis, Corey Myers, Andrea Spring
Science PresentationTeam Philosohook
Science Presentation
1. Goals and objectives2. Science background 3. Mechanical Design4. Electrical Design5. Testing6. Calibrations7. Results
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.
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.
SCIENCE BACKGROUND
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
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.
Balloon Radius
• Kaymont 3000 gm sounding balloon
• Ascent rate should be constant during flight
• Has not been in previous flights
Local Area
Regional Area
Our Flight Path
Palestine to Rusk
MECHANICAL DESIGN
Mechanical Drawings - ExternalTop
Front
Mechanical Design - Internal
Mechanical Design - Internal
ELECTRONICS DESIGN
Temperature Sensor Interface
Pressure Sensor Interface
Humidity Sensor Interface
Camera Interface
FLIGHT OPERATIONS: TESTING
Thermal Test
0 20 40 60 80 100 120-50
-40
-30
-20
-10
0
10
20
30
40
Thermal Test: Internal and External Temperature
External Temperature (C)Internal Temperture (C)
Time (Minute)
Tem
pert
ure
(C°)
Vacuum Test
Shock Test
-40 -30 -20 -10 0 10 20 30 400
50
100
150
200
250
300
Shock Test
intempouttemppreshumiditycam
Time (Seconds, 30 before and after drop)
ADC
Coun
ts
FLIGHT OPERATIONS: CALIBRATIONS
Temperature Calibration
External temperature sensor: Temperature(C°) = -.4439(ADC Count) + 28.3Error: ((.013151*ADC Count)^2+(.917709)^2)^.5 C°
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)
Pressure Calibration
Pressure
Counts
Pressure Sensor:Pressure(Atm)=.0039464(ADC counts)-.002953703Error=((1.98378e-5*ADC counts)^2+(.002055339)^2)^.5 Atm
Humidity Calibration
Humidity
Counts
Humidity Sensor:RH(%)= 0.4003(ADC count) – .1047Error: ((0.01453*ADC count)^2+(2.706038)^2)^.5%
RESULTS
0 5 10 15 20 25 30 35-20
-10
0
10
20
30
40 Internal Temperature vs Altitude
Internal Temper-ature Ascent
Internal Temper-ature Descent
Altitude (km)
Temperature (°C)
0 5 10 15 20 25 30 35-80
-60
-40
-20
0
20
40External Temperature vs Altitude
External Tem-perature Ascent
External Tem-perature De-scent
Altitude (km)
Temperature (°C)
0 5 10 15 20 25 30 35-10
-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)
12 13 14 15 16 17 18 19 20 21-70
-60
-50
-40
-30
-20
-10
0
External Temperature in the Tropopause (13-20 km)
Tropopause Ascent
Tropopause Descent
Altitude (km)
External Tem-perature
(°C)
0 5 10 15 20 25 30-80
-60
-40
-20
0
20
40
NOAA Data Noon 5/24Temperature vs Altitude
Altitude (km)
Temperature (°C)
0 5 10 15 20 25 30 350
200
400
600
800
1000
1200Pressure vs Altitude
Pressure Ascent
Pressure Descent
Altitude (km)
Pressure (mbar)
0 5 10 15 20 25 300
200
400
600
800
1000
1200
NOAA Data Noon 5/24Pressure vs Altitude
Altitude (km)
Pressurembar
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)
0 5 10 15 20 25 30 350
10
20
30
40
50
60
70
80
90
100
110Humidity vs Altitude
Humidity Ascent
Humidity Descent
Altitude (km)
Humidity (%rel)
Humidity Difference?
• 10% difference in humidity between ascent and descent
• 20 km mark on ascent and descent
• 1 km difference• 37.5 minute
difference
0 2 4 6 8 10 120
20
40
60
80
100
120
Humidity Information for the First/Last 11 km
Humidity First 10 km
Humidity Last 10 km
Altitude (km)
Humidity (%rel)
0 5 10 15 20 25 300
20
40
60
80
100
120
NOAA Data Noon 5/24Humidity vs Altitude
Altitude (km)
Humidity (%rel)
0 5 10 15 20 25 30 350
100
200
300
400
500
600
700
f(x) = 0.00902191299 x³ + 0.043658215562 x² + 4.69312331995 x + 147.340553136R² = 0.997416409913255
Radius vs altitude
Altitude [km]
Radius[cm]
