1. A Ballon for our school

4. Presentation of a stratospheric balloon Le ballon-sonde (inventé par Gustave Hermite en 1892) est utilisé pour faire des mesures à hautes altitudes (jusqu’à 30km). Il est utile aux domaines tels que la météorologie ou l’astronautique. The stratospheric balloon (by Gustave Hermite invented, 1892) is used to make measurement in the high height (up to 30 kilometres). It comes in handy to fields like meteorology or astronautics. Balloon Parachute Radar reflector GPS plateforme Basket O 1 metre To land gently Max 2.5kg To know the balloon position

5. The vector experimental Balloon The chain of flight supplied by the CNES Balloon We’ll use a latex ballon (1,2kg), what correspond of a balloon of 1, 5 meter and can be to 8m diameter. It’s the necessities tall for to embark a dispositive about 2,5 kg (mass of temperatures and speed probes, APN, GPS, camera and the radar) to 35km (114829 feet)altitude. Parachute We’ll use a parachute to slow down the fall after explosion of balloon. The nacelle with scientific experiments Different experiments are inside the nacelle. We have to prepare them today. The radar reflector It can give the balloon position to the plane and the air traffic. Until 8 m

6. The vector experimental Balloon The mass of the nacelle: 2,5 kg Upward speed: 5 m/s Height with explosion: 30 km Crosseddistance: 20 in 200 km Duration of a flight: 3 at 4 hours The flight of the balloon An unknown environment Extreme conditions (temperature, pressure) Risks of mastering (planes, fallen again on the ground

10. Temperature Calibration What is calibration ? That is a comparison between a voltage and a temperature. What did we do ? We compared the temperature the thermometer gave us with the voltage the sensor showed. Why do we need a calibration ? A sensor will be in the basket of the balloon. The sensor will give a tension in fonction of temperature. We recept the tension and we have to know the temperature. That's why we do a calibration .

11. Temperature Calibration

12. Temperature Calibration Volts °C

13. Planning before the release Time before the release Area of the release Station of telemetry H-100 H-95 Implementation of the material. H-80 H-60 Constitution of the chain of flight. H-50 H-40 H-35 Decision to make the release. H-30 The beginning of the inflating. H-25 H-20 Recover from temperature, pressure, … H-10 The end of inflating, closure of the ball. Collision of the chain of flight. H-5 H-3 H Release the balloon.

14. Real time GPS tracking

15. Quelques chiffres 3000 jeunes de 8 à 25 ans Opération créée en 1992 150 établissements scolaires (primaire, collège et lycée) 200 ballons lâchés chaque année de toute la France