Optical design & metrology : Heritage


ESTEC (end 2009)revious studies show the possibility to modify ESTEC Large Space Simulator to produce a 3-meter diameter light beam with a spectral irradiance produced by non-filtered Xenon lamps and the possibility to adjust the flux from 1 Solar Constant (SC) to 10 SC. This is required for the testing of ESA’s scientific cornerstone Beppi Colombo mission traveling to Mercury where the solar flux is 10 times higher than at earth level.   more



Industrial contract (end 2009)
The ARIES telescope is a 3.6 m aperture ground telescope located in Devasthal site in Indian Uttarakhand state. The telescope will be operated in the spectral range from 0.35 μm to 5.0 μm for astronomical observations. The scientific objectives of this telescope include in particular studies of the Doppler imaging and stellar magnetism in active and late type stars, astro-seismological studies of white dwarfs and chemically peculiar magnetic stars.   more



The objective of this activity is to produce a rigorous model of a laser ranging system.  more


The purpose of the activity is to establish the current state of the art of CTE (coefficient of thermal expansion) measurement techniques and to build expertise for future development of improved equipment.  more


(2007 – 2009) Walloon Region
In close collaboration with the industry CSL has designed a trifocal intra-ocular lens, an intra-ocular lens replaces the human crystalline lens in case of cataract surgery.
On the market one can find some bi-focal intra-ocular lenses, one focus for far vision (infinity) and one focus for close vision (reading at 33 cm), why a trifocal lens ? Because a lot of people having this kind of lens are not satisfied in case of intermediate vision (1 or 2 meters). The lens is a refractive-diffractive lens, consisting in the addition of kinoform diffractive profiles on a face of a refractive lens. This lens possess three distinct foci, one for far vision (refractive focus), one for close vision (a first diffractive focus) and one for intermediate vision (a second diffractive focus). The novelty of the design is that, due to the shape of the diffractive profiles, one can control the amount of light in the different foci. Moreover, due to shape of the diffractive profile, the amount of light in the different foci depends on the used area of the lens. The result of this study is being patented by the industrial customer. CSL is subcontractor of PHYSIOL.



Solar arrays are submitted to thermal cycles during in-orbit operations due to eclipses. Therefore, the qualification of solar arrays requires the exposition of solar array samples to thermal cycling tests, in order to verify their in-orbit performance   more 



(Started in 2009, ended 2011

The goal of the project is to select, adapt and qualify the sun sensor for the Solar Orbiter platform. CSL will demonstrate that it will be operational under the extreme environmental conditions due to the close proximity of the satellite with the Sun (0,25 AU). The extreme solar flux encountered during the mission lifetime required to develop sophisticated thermal protections for the complete satellite, such as front heat shield, thermal baffles and cooling radiators. The sun sensor is a crucial element for ensuring the pointing of the platform which is essential for the overall thermal control of the mission. This project is run for ESA with the Lambda-X company as prime. CSL is involved in the thermal aspect and the qualification of the system. 



Accurate prediction methodology and verification capability of thermal distortions become mandatory for ensuring the in-orbit high precision performance objectives of future programs.   more



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Contact(s) : Yvan Stockman ystockman@ulg.ac.be