Presentation2

SOLAR EXPERIMENT

SOLdering Alloys

in Reduced Gravity

Background Issues of soldering in reduced gravity

Gas bubbles from PCB Previous experiments

SoRGE ○ Found a problem with soldering in milli-gravity

CLEAR○ Finding a solution to the problem found in Sorge

ApplicationsReparations of components in space

○ Long distance space journeys and space stations

Experiment proposal

Our solutionNon pressurized enviroment

○ Overpressure and sample diffusionGas flow

○ Internal flux of solder

Need for a rocketReduced gravity

The experiment will melt

and cool nine samplesAtmosphere

○ Reference sample at 1atmVaccumGas flow with noblegas

Additional test done on groundReference sample

EXPERIMENT DESIGN

How it all works

The inside

the outside

Electrical overview

Power distribution

Microprocessor

ExperimentComponents

Transistor

Input voltage

Batteries

Power

Data

Model overview 3 main parts

Soldering chambersHeat plateCooling chamber

The soldering chambers Design 3 different chambers

PCBVacuum chamberAtmospheric chamberVacuum chamber with

gas flow

Heat element

DesignEasy to heat upRobust – Can handle vibrationsGood heat conductivityInsulated from rest of experiment

The heating processNiChrome wire

Cooling chamber

DesignHigh volume

Liquid nitrogen Insulation

Cork Valves

Security valve

Flow

Chamber with argon gasGas flow starts with melting process

Using liquid nitrogen in the cooling chamberGas flow starts when samples are

meltedEnough gas to cool below melting

temperature

Data Mass

The experiment○ 5.4 kg

Electrical components○ 1 kg

Gas container and valves○ 1.6 kg

Volume The experiment

○ 4.8 dm³

Current status Completed tasks

Research Current tasks

DesignCalculations

Future tasksBuild experimentObtain componentsTests

COMPONENTS OF SOLAR

Microcontroller and sensors –

How it all fits together

Components Microcontroller

32bit ARM Cortex M3○ 2*16 12bit-ADC-channels

SensorsTemperature

○ KTY84-150 Small size Large temperature range

Pressure○ XFHMC-001MPGR(H)

Temperature compensated Large measuring range

BatteriesSaft batteries7.4V / 4A / 40Wh / 265gWide temperature range

TransistorsHigh power MOSFETFed through a MOSFET driver

ValveCurrently looking in to electronic valves

Analysis of samples

CT scanUniversity in Finland

Comparing samplesFrom same chamberBetween chambersWith reference samples

Compile test data into a reportReport will evaluate if methods are viable

SUPPORT AND MEDIA

Our outreach program

Project funding

and supporing professors

Funding sources Swedish institute of

space physics, Kiruna Swedish national board

Division of space technology, LTU

Sponsorship

Facilities

Division of space technology, KirunaComputer simulation toolsWorkshop

Swedish institute of space physics, KirunaTests and development

Department of material engineering, Luleå

Expert advice Department of space science, IRV, Kiruna

Support from experts in the field of space engineering

Alf Wikström & Kjell Lundin Esrange, Kiruna Department of material engineering, Luleå University lecturer Esa Vuorinen, Material

science department, Luleå

Internet

Website Facebook Blog Youtube Twitter

Mediaour plan for getting noticed

Publications in magazinesNewspapers have been

positive to previous projects Television/Radio

Several radio and tv-stations

have had coverage of previous projects

Presentations

SeminarsSpread intrest of space science

Luleå university of technologyPresent project to new studentsIntroduce Rexus/bexus

High schoolsInspire the younger audience

TIME & PEOPLE

The SOLAR team

and estimated time plan

Organisation and key people

Team leaderAnders Svedevall

Hardware group

Adrian Lindqvist

Software group

Björn Paulström

Johan StrandgrenSara Widbom

Anneli PrentaElisabet Wejmo Hamoon Shahbazi

Electronics group

Martin Eriksson

Outreach group

Johan StrandgrenAnneli Prenta

Timeplan

QUESTIONS & ANSWERS

Questions from you

Questions to you

”With great power comes great responsibility” - Batman

32bit ARM Cortex M3 Specifications

72Mhz, 20Kb SRAM128Kb Flash memory

RoleCollecting and storing dataControlling temperature of heat plateOngoing measurements of pressure and

temperatureInitiates events based on a timeline

KTY84-150 Specifications

Resistance=f(temperature)Low operating current (2mA)Small size – 1.6x3.04mmLarge temperature range

(-40 to +300 °C) Role

Measure temperature at

each individual sample

XFHMC-001MPGR(H)

SpecificationsLarge measuring range -

0 to 1000KPaLow power (<10mA)Small size(14x7.6x10.15)

RoleMeasuring pressure in

each of the sample chambers

Batteries – 2 VL 34570

Specification7.4V / 4A / 40Wh / 265gWide temperature rangeLithium Ion cellsRechargeable

RoleDelivers power to the

heating element

Valve – AKVH 10

SpecificationsPWM controlled

RoleRegulate the flow of argon gas through one

of the test chambersActivate

Transistor

SpecificationsPWM controlled

Role Regulating current through the heating

element, which controls temperature.