Publications de Boris Clément Karamata

Design of a light confining concentrator for a solar photochemical reactor and upper bound to the method

Marilyne Andersen, Boris Clément Karamata

Optical concentration obtained by light confinement bears unique features that can increase the efficiency of a photochemical reactor. A suitable implementation of this method for a solar reactor is a series of parallel tubular receivers sealed in a slab-s ...

Spie-Int Soc Optical Engineering2016

Stationary solar concentrator delivering beyond the étendue law with homogeneous illumination

Marilyne Andersen, Boris Clément Karamata

We describe a concept for a novel stationary solar concentrator that relies on a new self-adaptive optical valve, non-imaging optics and the integrating sphere principle. Our analytical model reveals that this unique combination theoretically allows reachi ...

2014

Origin and nature of measurement bias in catadioptric parallel goniophotometers

Marilyne Andersen, Boris Clément Karamata

We briefly categorize and compare parallel goniophotometers, which are instruments capable of simultaneously measuring the far-field distribution of light scattered by a surface or emitted by a source over a large solid angle. Little is known about the acc ...

2014

Concept, Design and Performance of a Shape Variable Mashrabiya as a Shading and Daylighting System for Arid Climates

Marilyne Andersen, Boris Clément Karamata

The design of a solar protection system that can minimize solar gains while maximizing daylight and view to the outside is particularly challenging in arid climates, such as in the Middle-East, where sand, wind and corrosion impose specific constraints. We ...

CEPT University Ahmedabad2014

Revisiting parallel catadioptric goniophotometers

Marilyne Andersen, Boris Clément Karamata

A thorough knowledge of the angular distribution of light scattered by an illuminated surface under different angles is essential in numerous industrial and research applications. Traditionally, the angular distribution of a reflected or transmitted light ...

Spie-Int Soc Optical Engineering2013

Speckle statistics in optical coherence tomography

Boris Clément Karamata, Theo Lasser, Markus Laubscher, Kai Hassler

The two previously reported calculations of the amplitude distribution of speckles in optical coherence tomography, each based on a different mathematical formulation, yield different results. We show that a modification of an initial assumption in one of ...

2005

Multiple scattering in optical coherence tomography. II. Experimental and theoretical investigation of cross talk in wide-field optical coherence tomography

Stéphane Bourquin, Boris Clément Karamata, Marcel Leutenegger, Theo Lasser, Markus Laubscher

We present a comprehensive study of multiple-scattering effects in wide-field optical coherence tomography (OCT) realized with spatially coherent illumination. Imaging a sample made of a cleaved mirror embedded in an aqueous suspension of microspheres reve ...

2005

Multiple scattering in optical coherence tomography. I. Investigation and modeling

Stéphane Bourquin, Boris Clément Karamata, Marcel Leutenegger, Theo Lasser, Markus Laubscher

We present a new model of optical coherence tomography (OCT) taking into account multiple scattering. A theoretical analysis and experimental investigation reveals that in OCT, despite multiple scattering, the field backscattered from the sample is general ...

2005