Space Cadets

Space Cadets Ali Javed Ravneet Singh Brock Couvillion Dean Slama Temperature, Pressure, Humidity, and Imaging Characteristics at Various Altitudes 1/35

MISSION GOALS The goal is to study the relationships between the temperature, pressure, humidity, and altitude ranging from 0 to 100,000 ft in an effort to identify trends at various layers of the atmosphere using a balloon payload launched from Palestine, TX. 2/35

OBJECTIVES Fly a balloon payload to an altitude of 100,000 ft to measure, record and verify temperature, pressure, and humidity trends. Record video of the flight and verify the trends at various atmospheric layers. 3/35

Science Objectives Verify the decrease of temperature in tropopause Verify the increase of temperature in stratosphere Verify the decrease of pressure with altitude Verify the decrease in humidity with altitude. Identify the motion of flight. 4/35

Earth’s Atmosphere 5/35

Temperature 6/35

Pressure 7/35

HUMIDITY • Amount of moisture the air can hold before it rains. MOISTURE RAIN 8/35

LINEAR VOLTAGE SENSOR 30 SECONDS 9/35

653 ft elevation 209 ft elevation Areas that are elevated have a higher percentage of humidity compared to areas of lower elevation. 20 ft elevation 10/35

IMAGING CHARACTERISTICS 11/35

System Design 12/35

Sensors • 1N457 Diode • Voltage across diode varies with temperature • HIH-4030 • Humidity Sensor • Output is linear voltage from .8-5V • Model 1230 Ultrastable Pressure Sensor • Outputs Potential Difference • Pressure Sensor 13/35

1N457 • .5 mA Current from LM234 CS • Outputs Voltage Across Diode 14/35

HIH 4030 • 5V Power from Voltage Regulator • Linear Voltage Output 15/35

Model 1230 Ultrastable Pressure Sensor • 1.5 mA from LM234 CS • Output Potential Difference ADC Ch 2 16/35

Camera Control Circuit 17/35

Control System • Basic Stamp issues commands • Retrieves Values From ADC & RTC • Writes to EEProm • Sends commands to Camera • Camera Data stored in internal Memory 18/35

Software • Pre-Flight Software • Flight Software • Data Retrieval Software 19/35

Pre-Flight Software • Sets RTC • Sets Initial Address 20/35

Flight Software • Initializes • Enters Sensor Reading Loop • Controls Camera 21/35

Data Retrieval Software • Determines First & Last Used Addresses • Enters Reading Loop 22/35

Data Format & Storage At 12 Bytes a minute for 240 minutes, 12 * 240 = 2.88kb 23/35

Power Supply 24/35

Power Budget Power Source 1: 8AAA Lithium Battery Pack Power Source 2: 3AA Lithium Battery Pack 25/35

Battery Derating Curves AAA Lithium AA Lithium 26/35

Thermal Design • Thermal test successful • No additional heating system required 27/35

Mechanical Design (External) • Nearly Cubical Shape • 18.5 cm * 15 cm • 18 cm in height 28/35

Mechanical Design (Internal) • Camera mounted in bottom corner of shell • Power systems secured behind camera • BalloonSat attached to one of the walls; Conditioning board on opposite wall • 3 sensors 29/35

Weight Budget 30/35

System Testing Procedures • Thermal Test • Prove payload function under extreme temperature environments during 4 hour period • Shock Test • Prove payload resilience to force of free fall 31/35

Calibration Procedures • Calibration of temperature sensor • Calibration of pressure sensor • Calibration of humidity sensor 32/35 31

Pre-Launch Checklist • 24 Hours Before Launch • Morning Before Launch • Post Flight 33/35

Data Acquisition and Analysis Plan 34/35

Questions? 35/35

Space Cadets

Space Cadets

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