Publication

Intensifying Brillouin distributed fibre sensors using image processing

Publications associées (36)

Direct measurement of fiber Bragg grating local birefringence using optical low coherence reflectometry

René Salathé, Hans Georg Limberger, Dragan Coric

Optical low coherence reflectometry (OLCR) was used for the measurement of the local fiber Bragg grating (FBG) birefringence. The birefringence with resolution of 4 x 10(-6) was determined directly from oscillations in the OLCR amplitude with a spatial res ...

2005

Superresolution images reconstructed from aliased images

Martin Vetterli, Sabine Süsstrunk, Patrick Vandewalle

In this paper, we present a simple method to almost quadruple the spatial resolution of aliased images. From a set of four low resolution, undersampled and shifted images, a new image is constructed with almost twice the resolution in each dimension. The r ...

2003

Frequency analysis of classical Preisach model

Marten Sjöström

The paper contains an analysis of the classical Preisach model from a frequency point of view. A Fourier analysis retrieves the necessary and sufficient conditions on the Preisach weighting function to have an output with half-wave symmetry, i.e. only odd ...

1999

Distributed sensing using stimulated Brillouin scattering : towards ultimate resolution

Luc Thévenaz, Philippe Robert, Alexandre Fellay

In this paper, we discuss the fundamental limitations of the SBS analysis as a distributed sensing method when the spatial resolution is in the meter range. We also present a novel experimental configuration that reaches the best performances achievable fo ...

OSA1997

Bilinear time-frequency representation of signals: The shift-scale invariant class

Rüdiger Urbanke

The class of bilinear time-frequency representations (BTFR's) that are invariant (or covariant) to time shifts, frequency shifts, and time-frequency scalings. This shift-scale invariant class is the intersection of the classical shift-invariant (Cohen) cla ...

1994

Tissue investigation with optical coherence domain reflectometry

René Salathé, Fabienne Marquis Weible

Optical coherence domain reflectometry is applied here to the study of diffusive biological tissue. This non-contact technique allows us to probe the light reflected at a tissue interface, and the back scattered light through the tissue thickness, with ver ...

Publ by Int Soc for Optical Engineering1992

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