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Témoignage d'étudiants: Etienne Thalmann, au CSEM
Etienne Thalmann, EPFL Graduate in Mechanical Engineering
Wednesday, May 18, 2016 · 2:58 p.m. · 06m 10s
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Good afternoon everyone. So as suppress
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and mention I'm recent graduate in
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mechanical engineering maybe my master
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project industry it's yes yeah so but
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the context of this collaboration that
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comes from a collaboration between the
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automatic control abbott. PFL and us
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with centre for electronics and micro
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technology initial there the goals
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where on one hand to update CSTM on the
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latest. Um control techniques developed
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in the latter day PFL and on the other
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hand for me to apply the knowledge that
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I quite a during my classes here in a
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professional environment. So during my
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project I had the great opportunity to
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work on two different systems that are
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developed a TSTM the first system that
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you can see here on the left is the
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micro electromechanical system also
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known as members. So very tiny actuator
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that it is used to control the position
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of them your so you can you can display
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some your and on the on the setup that
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you see there's a laser that is
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reflected on the mirror. And then
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projected on the screen. So by moving
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the mirror you can draw some trajectory
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with your laser beam the second system
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on the right is also on a mobile
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reflector but that only translating one
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very dimension and this is part of an
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of interferometer for weather satellite
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that will be used to measure the
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infrared spectrum of the atmosphere. So
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for what the systems the the object of
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a similar. So it's to design a
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controller what is a controller so it's
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it's an algorithm that is in charge of
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making it a system follow some kind of
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input reference to follow trajectory to
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do some motion but also reject external
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distribution. So but this for both
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systems the idea of control is similar
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but then you have very different
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properties also different challenges
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for the for the men smear. Um the
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challenge was that the system the point
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is the system very when you when you
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move it. It's nonlinear. And also when
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it gets warmer so so the we can change
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and within one batch of manufactured
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devices also the put is can change a
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bit so you need something that is very
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robust that work forces for different
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systems. And for the interferometer. Um
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there are other instruments around it
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in in the satellites that will vibrate
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and disturb the the motion of of the
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mirror so you want to have a very nice
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and smooth motion. So this is where my
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adviser at EPFL was very helpful doctor
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carry me who I developed the theory
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that I applied but since I had
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different constraints. And two
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different systems I I was very happy to
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to see him about once a month to asking
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questions so you could write or in me.
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And then I also who interact a lot with
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my supervisor at SEM who I helped me
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when I was making measurements and
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implementing everything on the systems.
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And working in the clean room
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environment and so so to advisers is
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also very interesting thing no but the
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results of my project for the Memphis
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mirror. I came up with the method that
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the client that so that was an external
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plan to asked us for this and he can
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you could use this method with
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different device that he would
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manufacture you just press a button and
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almost everything would be done
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automatically and have something robust
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that would work for new device and for
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them interferometer the errors caused
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by the external disturbances could be
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reduced a lot as you can see on the on
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the graph here you have the the error
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on the Y axis and the displacement on
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the horizontal X axis. And with the
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previous controller that already
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existed in blue the error and central
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position was about fifty percent bigger
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than what it is now in orange with them
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the controller that I design now if I
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summarise the benefits of master
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project in industry I think it's it's a
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which are the parts needed to work on
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real projects with specifications that
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are set by by clients and you learn a
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lot from interacting with both surprise
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or from a different and from the
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industry and also from all the
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experiments you do your your mistakes
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of course. Um I also had a lot of
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colleagues that we're very interesting.
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And I increased my my network with this
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project I also had approach needed to
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visit the factory of one of an hour
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week external clients as very enriching
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and finally it was also reporting D for
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me to publish something so part of my
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results would be probably should the
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American control conference this july.
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So that's that's cool. I now in
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conclusion. I think that that is
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massive projects in industry combine
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the advantages both of them this is in
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academy and of the internship because
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you do really scientific work. And your
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participating in the latest research
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but also you evolve in a professional
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environment and it's really a nice
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enter into the professional world. And
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this is good was very valuable for me
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and help me I think a little so to to
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get a job after the end of my studies.
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