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Gerhard Lammel

Related publications (12)

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Influence of aerosol acidity and organic ligands on transition metal solubility and oxidative potential of fine particulate matter in urban environments

Athanasios Nenes, Gerhard Lammel

The adverse health effects of air pollution around the world have been associated with the inhalation of fine particulate matter (PM2.5). Such outcomes are thought to be related to the induction of oxidative stress due to the excess formation of reactive o ...

Amsterdam2023

Aerosol Health Effects from Molecular to Global Scales

Andrea Mario Arangio, Gerhard Lammel

Poor air quality is globally the largest environmental health risk. Epidemiological studies have uncovered clear relationships of gaseous pollutants and particulate matter (PM) with adverse health outcomes, including mortality by cardiovascular and respira ...

American Chemical Society2017

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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

The invention concerns a method for making a suspended microstructure comprising the following steps: forming a masking layer on a substrate top surface; structuring the masking layer to form at least an opening substantially defining the surface of said m ...

2002

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We present a MEMS infrared spectrometer for selective and quantitative chemical gas analysis. infrared absorption spectroscopy can distinguish gases easily and also detect nonreactive molecules like CO2, in contrast to e.g. metal oxide gas sensors The foll ...

2001

Microspectrometer based on a tunable optical filter of porous silicon

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a tunable interference filter for infrared and visible light that scans the desired part of the optical spectrum within milliseconds. A single pixel detector measures serially the intensity at selected wavelengths. This concept avoids expensive ...

2001

MEMS spectrometer for infrared gas analysis based on a tunable filter of porous silicon

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

We present a MEMS infrared spectrometer for selective and quantitative chemical gas analysis. It contains a tunable optical filter of porous silicon that allows to measure the infrared absorption of a gas mixture at different wavelengths serially with only ...

2001

Low cost microspectrometer

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

2000

Thermally actuated microprojector for optical display applications

Philippe Renaud, Sandra Schweizer, Gerhard Lammel

A dual axis, raster-scanning laser display based on a monolithic micromachined scanning mirror is presented. The scanner consists of a micromirror located at the end of a thermally actuated bimorph beam. The novelty of the device is that an "L"-shape canti ...

2000

Free-standing, mobile 3D porous silicon microstructures

Philippe Renaud, Gerhard Lammel

This paper suggests a new fabrication method for surface micromachining based on porous silicon formation followed by electropolishing. in contrast to its known use as a sacrificial layer, in this work, porous silicon will be employed as constitutive mater ...

2000