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Microspectrometer based on a tunable optical filter of porous silicon

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Micromirrors for integrated tunable mid-infrared detectors and emitters

Niels Quack

The mid-infrared range is of interest in spectroscopic applications, due to the large number of organic compounds that exhibit characteristic absorption bands in this spectral region. Semiconductor technology, however, has been developed mainly for the nea ...

ETH2009

Using Digital Cameras as Quasi-Spectral Radiometers to Study Complex Fenestration Systems

Marilyne Andersen

This work discusses the use of digital cameras fitted with absorption filters as quasi-spectral radiometers. By filtering incident light into selected wavelength intervals, accurate estimates of radiances can be made for unknown spectra. This approach is b ...

SAGE Publications2009

Illuminant estimation and detection using near infrared

Sabine Süsstrunk

Digital camera sensors are sensitive to wavelengths ranging from the ultraviolet (200-400nm) to the near-infrared (700-100nm) bands. This range is, however, reduced because the aim of photographic cameras is to capture and reproduce the visible spectrum (4 ...

2009

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Digital camera sensors are inherently sensitive to the near-infrared (NIR) part of the light spectrum. In this paper, we propose a general design for color filter arrays that allow the joint capture of visible/NIR images using a single sensor. We pose the ...

2009

Amazing and beautiful optical effects are present in Nature. Some examples are the iridescent colors produced by peacocks, butterflies and beetles. While the simulations of some of these structures have already been realized, only a few elements have been ...

Institut de Microtechnique, Université de Neuchâtel2008

A nanoimprint lithography for fabricating SU-8 gratings for near-infrared to deep-UV application

Shenqi Xie, Yi-Chiang Sun

We demonstrate the nanofabrication of the transmission SU-8 gratings with periods from 200 nm (5000 lines/mm) to 1 lm (1000 lines/mm) with different trench depths for applications from near-infrared to deep-UV wavelength. The imprint property of SU-8 under ...

2008

Ink thickness variations for the control of color printers

Roger Hersch, Peter Amrhyn

The present invention proposes a method and a computing system for deducing ink thickness variations from spectral reflectance measurements performed on a printing press or on a printer. The computed ink thickness variations enable controlling the ink depo ...

2007

Glazing

Josef Andreas Schuler

GLAZING Field of the invention The present invention relates to glazings which, in particular, may be used in solar collectors. In the present text, the term "glazing" means any material, e.g. glass or polycarbonate, transparent to visible electromagnetic ...

2003

Tunable optical filter of porous silicon as key component for a MEMS spectrometer

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a microspectrometer based on a tunable interference filter for infrared or visible light that scans the desired part of the spectrum within milliseconds. A single pixel detector measures serially the intensity at selected wavelengths. This conce ...

2002

Mesure de traces de gaz à l'aide de lasers à semi-conducteur

Infrared spectroscopy using semiconductor lasers is a promising technique for trace gas detection. It allows a continuous and real time monitoring of several species, with a high sensitivity and a good selectivity. Among all the possible methods two are pa ...

EPFL2002