Description du projet
Une approche laser viable pour contrôler les polluants organiques dans l’air
La pollution atmosphérique fait peser une menace de plus en plus pressante sur les grandes villes, mais le contrôle des composés organiques volatils et des polluants organiques persistants grâce aux technologies électrochimiques ou laser existantes s’avère délicat. Financé par le programme Actions Marie Skłodowska-Curie, le projet CEMoS-OFC vise à mettre au point une nouvelle classe de spectromètres laser à large bande et à haute résolution pour le contrôle de l’air à trajet ouvert. Ces instruments exploiteront une paire de peignes de fréquences optiques qui fonctionnent dans le spectre de l’infrarouge moyen, où sont visibles les raies d’absorption des composés organiques volatils et des polluants organiques persistants. En utilisant cette méthode informatique d’amélioration du signal en temps réel et en éliminant le besoin d’équipement électronique complexe, le projet ouvre la voie à des mesures pratiques de mélanges gazeux multi-espèces sur des canaux à trajet ouvert longs de plusieurs centaines de mètres.
Objectif
Air pollution is an increasingly important concern in larger cities and industrial areas. To date, much attention has been devoted to monitoring of particulate matter (PM), yet sensing of toxic or cancerogenic gas species formed i.e. in combustion of low-quality fuels is still challenging. The new National Emissions Ceilings (NEC) Directive (2016/2284/EU) has set commitments for member states on several important air pollutants, of which two groups: non-methane volatile organic compounds (NMVOCs), and persistent organic pollutants (POPs) are difficult to monitor using existing electrochemical or laser-based technologies to ensure sufficient sensitivity and selectivity. To address this need, the objective of this proposal is to develop a novel class of broadband and high-resolution laser spectrometers for open-path atmospheric monitoring. The instrument will exploit a pair od optical frequency comb (OFC) sources, which operate in the spectroscopically-relevant mid-infrared region where NMVOCs and POPs have their strongest and most unique absorption features. Unlike all prior attempts, this project aims to advance the field by enabling completely unstabilized operation of the sources using real-time computational signal enhancement referred to as Computationally Enhanced Molecular Sensing with Optical Frequency Combs (CEMOS-OFC). By generating two mutually coherent OFCs in a shared cavity, the need for complex phase synchronization electronics in dual-comb spectroscopy is eliminated, which paves the way for practical out-of-laboratory measurements of multi-species gas mixtures over open-path channels reaching hundreds of meters corresponding to part-per-million to parts-per-billion sensitivities. In addition to environmental gas sensing, spectroscopic analysis of simple algae and pharmaceuticals in the mid- to far-infrared region is also proposed.
Champ scientifique
- natural sciencesbiological sciencesmicrobiologyphycology
- natural scienceschemical sciencesorganic chemistryvolatile organic compounds
- engineering and technologyenvironmental engineeringair pollution engineering
- natural sciencesearth and related environmental sciencesenvironmental sciencespollution
- natural sciencesphysical sciencesopticsspectroscopy
Mots‑clés
Programme(s)
Régime de financement
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinateur
50-370 Wroclaw
Pologne