2. 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
Applications
Reparations of components in space
○ Long distance space journeys and space stations
3. Experiment proposal
Our solution
Non pressurized enviroment
○ Overpressure and sample diffusion
Gas flow
○ Internal flux of solder
Need for a rocket
Reduced gravity
4. The experiment will melt
and cool nine samples
Atmosphere
○ Reference sample at 1atm
Vaccum
Gas flow with noblegas
Additional test done on ground
Reference sample
6. Electrical overview
Input Power
voltage Data
Power Batteries
distribution
Microprocessor Transistor
Components Experiment
7. Model overview
3 main parts
Soldering chambers
Heat plate
Cooling chamber
8. The soldering chambers
Design
3 different chambers
PCB
Vacuum chamber
Atmospheric chamber
Vacuum chamber with
gas flow
9. Heat element
Design
Easy to heat up
Robust – Can handle vibrations
Good heat conductivity
Insulated from rest of experiment
The heating process
NiChrome wire
11. Flow
Chamber with argon gas
Gas flow starts with melting process
Using liquid nitrogen in the cooling
chamber
Gas flow starts when samples are
melted
Enough gas to cool below melting
temperature
12. Data
Mass
The experiment
○ 5.4 kg
Electrical components
○ 1 kg
Gas container and valves
○ 1.6 kg
Volume
The experiment
○ 4.8 dm³
13. Current status
Completed tasks
Research
Current tasks
Design
Calculations
Future tasks
Build experiment
Obtain components
Tests
15. Components
Microcontroller
32bit ARM Cortex M3
○ 2*16 12bit-ADC-channels
Sensors
Temperature
○ KTY84-150
Small size
Large temperature range
Pressure
○ XFHMC-001MPGR(H)
Temperature compensated
Large measuring range
16. Batteries
Saft batteries
7.4V / 4A / 40Wh / 265g
Wide temperature range
Transistors
High power MOSFET
Fed through a MOSFET driver
Valve
Currently looking in to electronic valves
17. Analysis of samples
CT scan
University in Finland
Comparing samples
From same chamber
Between chambers
With reference samples
Compile test data into a report
Report will evaluate if methods are viable
19. Funding sources
Swedish institute of
space physics, Kiruna
Swedish national board
Division of space
technology, LTU
Sponsorship
20. Facilities
Division of space technology, Kiruna
Computer simulation tools
Workshop
Swedish institute of space
physics, Kiruna
Tests and development
Department of material
engineering, Luleå
21. 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
23. Media
our plan for getting noticed
Publications in magazines
Newspapers have been
positive to previous projects
Television/Radio
Several radio and tv-stations
have had coverage of previous projects
24. Presentations
Seminars
Spread intrest of space science
Luleå university of technology
Present project to new students
Introduce Rexus/bexus
High schools
Inspire the younger audience
26. Organisation and key people
Team leader
Anders Svedevall
Hardware Electronics Software Outreach
group group group group
Adrian Lindqvist Martin Eriksson Björn Paulström
Johan Strandgren Anneli Prenta
Sara Widbom Elisabet Wejmo Johan Strandgren
Hamoon Shahbazi
Anneli Prenta
29. 32bit ARM Cortex M3
Specifications
72Mhz, 20Kb SRAM
128Kb Flash memory
Role
Collecting and storing data
Controlling temperature of heat plate
Ongoing measurements of pressure and
temperature
Initiates events based on a timeline
30. KTY84-150
Specifications
Resistance=f(temperature)
Low operating current (2mA)
Small size – 1.6x3.04mm
Large temperature range
(-40 to +300 °C)
Role
Measure temperature at
each individual sample
31. XFHMC-001MPGR(H)
Specifications
Large measuring range -
0 to 1000KPa
Low power (<10mA)
Small size(14x7.6x10.15)
Role
Measuring pressure in
each of the sample chambers
32. Batteries – 2 VL 34570
Specification
7.4V / 4A / 40Wh / 265g
Wide temperature range
Lithium Ion cells
Rechargeable
Role
Delivers power to the
heating element
33. Valve – AKVH 10
Specifications
PWM controlled
Role
Regulate the flow of argon gas through one
of the test chambers
Activate
34. Transistor
Specifications
PWM controlled
Role
Regulating current through the heating
element, which controls temperature.
Hinweis der Redaktion
Gas bubbles reduces the quality of the soldesSoRGE: done in pressurized enviromentCLEAR: finding a solution to the problem, simular to our projectApplications: reparing or improve space crafts, save money
Gas flow: create a movement in the soldesNeed a rocket: This phenomena only occurs in reduced gravity
Additional tests done for comparison
We will seek funding from:We will also seek sponsorships for material and components.
We will have access to:We will be able to perform tests…The project is also supported by the Depart… where we have access to there facilities.
Alf and Kjell, with years of experinence from baloon and rocket campaigns at Esrange in Kiruna are supervising and supporting the SOLAR project In luleå we are supported by the depart….which we can consult if any problems occure. The team will have a close relation to:
Internet is a a perfect way to reach a large audience. First of all we will create a website where u can find our contact info, learn more about our experiment and about the Rexus-project. It is also a place where our sponsors can be presented. Facebook allows us to update the audience with news and pictures about the forthcoming of the project and we can easily answer to questions. The blog is a fine way to update with pictures and information about the project. Youtube and twitter belongs to the future part of the outreach program. On youtube we can publish videos of launch and tests during the project and if there is a large audience we will use twitter as a quicker way to post updates about the project.
These are a few examples of the magazines that we will contact to be published so that we can intrest others to space science and inspire other students to participate in projects. Television and Radio allows to do the same but reach a wider audience than by magazines.
There is a lot of acitivities at the university where we could give a presentation about our experiment but also about the Rexus project. We would also like to give presentations at high schools so that we can inspire them to find an intrest in science but also just to inspire them to continue there studies after high school graduation.
Anders – studying towars master in space engineering and participated in The Bexus project Marvel previous year.Adrian – Hard ware coordinator, studying towards master in aerodynamicsBjörn – soft ware coordinator, master in computer science and imbedded systems.Martin – master in spacecraft and instrumentation focusing on development of electronics. Anneli and Johan are the outreach coordinators. I have been responsible for the outreach programs in several different student groups including seeking sponsorships.