Opto-mechatronic Active isolation SYStem | BEAMS

Opto-mechatronic Active isolation SYStem

PhD information
Proposal (funding available)
Start date: 
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Research theme: 
BEAMS supervisors

Opto-mechatronic Active isolation SYStem


The BEAMS department is searching for a highly motivated and skilled PhD researcher with a good background in dynamics and control of mechatronic systems.


The research will be carried out in the BEAMS department of the Université Libre de Bruxelles (ULB), Brussels, Belgium.


An increasing number of high–precision applications require very stable platform, like wafers of semiconductor manufacturing machines, and atomic force microscopes. Emblematic examples of very stringent seismic isolation requirements concerns sensitive equipment of large instruments dedicated to experimental physics, like electromagnets of particle colliders, or mirrors of gravitational wave detectors. The standard procedure is to mount the sensitive equipment on a vibration isolating stage, sometimes referred to as optical table, which can be either passive or active. Typically, commercial optical tables filter out 99 % (or 40dB) of the transmitted vibrations from 1 Hz until several hundred Hertz. However, the achieved stability remains limited by several factors, including magnetic couplings, limited sensor resolution, limited stability of the feedback loops… The objective of this PhD is to develop a ground-breaking active vibration isolation stage, which will drastically decouple the isolated payload from ground vibrations by addressing the aforementioned limitations. The proposed strategy will rely on the combination of high precision interferometric inertial vibration sensors [1] and robust control laws [2].


[1] COLLETTE C., NASSIF F, AMAR J., DEPOUHON C. and GORZA S.-P., A non-magnetic optical inertial sensor, Sensors and Actuators A: Physical (2015).


[2] COLLETTE C. and MATICHARD F., Sensor fusion methods for high performance active vibration isolation systems, Journal of sound and vibration, 342, 1-25 (2015).


Research Fields

Engineering - Control engineering

Engineering - Mechanical engineering

Career Stage

Early stage researcher or 0-4 yrs (Post graduate)

Research Profiles

An ideal candidate has a degree in engineering and a strong background in structural dynamics, system control, optics, mechatronics, modeling (Matlab, finite elements), a fascination for large physics instruments. Proficiency in English is a requirement.


The funding of the PhD is secured for the first year. The NET salary is 1879,32 €/month. After this trial period, the candidate will be encouraged to renew his funding by applying for a grant. The start date may be already 01/03/2015.


To apply, send an email to christophe [dot] collette [at] ulb [dot] ac [dot] be

Subject of your email should be: OASYS PhD application. 

Please, include in your application email:

- a curriculum vitae

- a copy of your diplomas

- a list of courses taken

- a list of at least two referees: names and email addresses



For more information please contact Prof. dr. ir. Christophe Collette: Christophe [dot] collette [at] ulb [dot] ac [dot] be

You can apply for this job no later than 22/02/2015.

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