Project overview

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Introduction

The “Small HAGARE” project is an experiment where a gamma ray sensor is sent in the stratosphere with the help of a small payload balloon. The goal of this project is to gain experience in balloon flight and specific embedded system design as well as create and test a custom gamma ray sensor. SHAGARE is essentially the prototyping phase of the High Altitude Gamma-Ray Experiment (HAGARE)

 

System architecture

The idea is to build a system able to sample, transmit and save scientific & housekeeping data. The whole system must weight less than 1.5 Kg and resist to : temperatures that can drop to -60°C , 3 meters equivalent free fall, very low pressure (0.5 mbar = 0.00045 atm) and have at least 3 hours of battery autonomy.

 

 

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Sub Systems

 

 

O.G : Olivier Girard, LPHE – Physics Master Student      

J.V : Joël Vallone, LAP – Computer Science Master Student

 

 

Student

Key words

Key contacts

 

Gamma ray sensor

O.G

crystal (CsI),

PIN photodiodes,

sample & hold,

event triggered,

Stratosphere

 1 [event/(cm^2*s)]

 

Prof. Aurelio Bay – LPHE supervisor

Raymond Frei -  LPHE electronics

Housekeeping electronics

J.V

Battery voltmeter

Temperature sensor

Clock

Humidity sensor

Thermo resistor

Magnetometer

Sample rate : 5 Hz

 

René beuchat – LAP supervisor

Federico Belloni – SSC electronics

Communication system

J.V

Radiometrix – HX1

3 Kbit/s

FM 300mW Transmitter

144.390, 144.800 and 169.4125MHz

 

Federico Belloni – SSC electronics

Software & microcontroller

J.V

ARM Cortex M0

Microcontroller

Sampling, forwarding & storage

 

René beuchat – LAP supervisor

Federico Belloni – SSC electronics

Power system

O.G

&

J.V

Resilient : down to -40°C

5 hours autonomy

DC/DC

Light weight

 

Federico Belloni – SSC electronics

Flight, Gondola, balloon, GPS

O.G

&

J.V

Max 1.5 Kg capacity

Thermal isolation

Mechanic Skeleton

Landing : 3 m free fall equivalent

SPOT - GPS live tracking

Anton Ivanov – SSC supervisor

Dr. jean-Michel Clerc  - MétéoSuisse

??? - Mechanical engineer

 

 

 

 

  

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