Concept

Ray tracing (physics)

Publications associées (60)

Precision Isosurface Rendering of 3-D Image Data

We address the task of rendering by ray tracing the isosurface of a high-quality continuous model of volumetric discrete and regular data. Based on first principles, we identify the quadratic B-spline as the best model for our purpose. The nonnegativity of ...

IEEE2003

Bi-directional light transmission properties assessment for venetian blinds : Computer simulations compared to photogoniometer measurements

Marilyne Andersen, Jean-Louis Scartezzini

An accurate evaluation of daylight distribution through advanced fenestration systems (complex glazing, solar shading systems) requires the knowledge of their Bi-directional light Transmission Distribution Function (BTDF). An innovative equipment for the e ...

2003

Study of the beam path distortion profiles generated by a two-axis tilt single-mirror laser scanner

René Salathé, Thomas Sidler, Moustapha Hafez

Beam distortion profiles are studied for scanning devices that have a single mirror with two rotational degrees of freedom (DOF), also named tip/tilt scanners. The case of a fast steering scanner used for high power material processing applications is stud ...

2003

X-ray imaging techniques and exobiology

Philippe Gillet

X-ray imaging techniques at the best spatial resolution and using synchrotron facilities are put forth as powerful techniques for the search of small life forms in extraterrestrial rocks under quarantine conditions. Absorption and fluorescence X-ray microt ...

2003

Reflection of waveguided X-rays in two-dimensional nanostructures

Christian David

The internal reflection of an excited X-ray waveguide mode in a synthetic nanostructure, defined by electron-beam lithography, has been measured. In this device, the X-ray beam is first coupled into a conventional vertical thin-film waveguide structure and ...

2002

High-Quality Isosurface Rendering with Exact Gradient

Michaël Unser, Philippe Thévenaz

We address the task of rendering by ray tracing the isosurface of a high-quality continuous spline model of volumetric discrete and regular data. By expressing the spline model as a sum of nonnegative B-splines, we are able to confine the potential locatio ...

IEEE2001

Microlens systems for fluorescence detection in chemical microsystems

Nico de Rooij, Hans Peter Herzig, René Dändliker

Micro-optical systems based on refractive microlenses are investigated. These systems are integrated on a chemical chip. They focus an excitation beam into the detection volume (microliter or even submicroliter scale) and collect the emitted light from flu ...

2001

Microlens systems for fluorescence detection in chemical microsystems

Nico de Rooij, Hans Peter Herzig, René Dändliker

2001

X-ray waveguides with multiple guiding layers

We have generalized the principle of resonant X-ray beam coupling to waveguides containing multiple guiding layers and characterized their X-ray optical properties. In such a device, several coherent beams of a width on the order of 10-100 nm can be extrac ...

2000

Measurement of the optical depth at the third electron cyclotron harmonic in tore supra

Olivier Sauter, Timothy Goodman, Minh Quang Tran, Antoine Pochelon

The linear relativistic theory of electron cyclotron wave propagation predicts partial absorption of the extraordinary mode at the third electron cyclotron harmonic for typical parameters of present day tokamak plasmas. Since the waves are not totally damp ...

1996

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