Miniaturization of a multi-gas sensor for environmental gases based on mid-infrared Quantum Cascade Lasers (QCL) and silicon integration of photoacoustic cells
Résumé
For environmental purposes, it is important to measure the temporal and spatial variations of a number of gases. Human-related activities' gases emissions need monitoring relatively to climate change, landfill survey or air pollution. A current limitation is the deficiency of compact and lightweight manufactured sensors capable of selectively quantifying air pollutants, such as CO 2 , CH 4 , CO or N 2 O. Currently used multi-gas sensors are expensive, large and need calibration frequently for each gas to be detected. Photoacoustic Spectroscopy has demonstrated to be a promising technology for addressing downsizing and integration of multi-gas detection. This shows the potential for miniaturization of mid-IR sensors