Raphael Vallon

Monitoring of Gaseous CO2 in the Headspace of Champagne Glasses by Infrared Laser Spectrometry

We report the development, the validation and the application of an infrared diode laser spectrometer devoted to the monitoring of gaseous carbon dioxide in the headspace of Champagne and sparkling wines glasses.

Monitoring gas-phase CO 2 in the headspace of champagne glasses through combined diode laser spectrometry and micro-gas chromatography analysis

During Champagne or sparkling wine tasting, gas-phase CO2 and volatile organic compounds invade the headspace above glasses, thus progressively modifying the chemical space perceived by the consumer. Gas-phase CO2 in excess can even cause a very unpleasant tingling sensation perturbing both ortho- and retronasal olfactory perception. Monitoring as accurately as possible the level of gas-phase CO2 above glasses is therefore a challenge of importance aimed at better understanding the close relationship between the release of CO2 and a collection of various tasting parameters. Here, the concentration of CO2 found in the headspace of champagne glasses served under multivariate conditions was accurately monitored, all along the 10 min following pouring, through a new combined approach by a CO2-Diode Laser Sensor and micro-gas chromatography. Our results show the strong impact of various tasting conditions (volume dispensed, intensity of effervescence, and glass shape) on the release of gas-phase CO2 above the champagne surface.

Simulation and Design of Compact Helmholtz Photoacoustic Cells for Atmospheric Gas Sensing

In the framework of research program called MIRIADE, GSMA reports simulations and developments of compact Helmholtz resonant photoacoustic cells developed for the optical sensing of the atmosphere when associated with mid-infrared sources such as QCLs.

Line profile study of the R6 multicomponent of CH 4 around 1.6 µm for the French-German climate mission MERLIN

In the framework of research program MERLIN, GSMA and LISA report the development of a spectrometer especially dedicated to the measurement of high-resolution spectroscopic parameters of R6 multicomponent of methane in the 1.6 µm region.

Coherent quantum cascade laser array at 8.2 μm in extended-cavity system

In the framework of research program “COCASE”, GSMA and III-V lab report the development of a monolithic quantum cascade array emitting at 8.2 μm mounted in an external-cavity system in order to obtain wide tunability.

A coherent quantum cascade laser array for high power emission

In the framework of the ANR project called COCASE, GSMA and III-V Lab develop a coherent quantum cascade laser array to obtain high power emission. This source will be combined to a photoacoustic spectrometer devoted to trace gas detection [1]. In such a spectrometer the sensitivity limit is directly proportional to the laser power.