Objectif - Development of selective sensors for hydrocarbons in water;- Development, investigation and test of systems that employ mid infrared fiberoptic evanescent wave spectroscopy.- Selective and sensitive sub ppm detection of selected hydrocarbons in water was demonstrated. The experimental sensitivity allowed detection of 50 ppb tetrachloroethylene (TeCE) in water.- The fibres were analysed and optimised for their sensor performance.- Polymers were analysed. The 50 ppb result was obtained with polyisobutylene (PIB) coating.- A laboratory sensor system was built, that made use of our new 'pulse modulation' laser technique.- Special fibres for the mid infrared were made and improved for transmission of the radiation of tuneable diode lasers, as required for the high sensitivity sensor application;- Polymer fibre coatings were optimised. The polymer coating isolates the mid infrared radiation from the extremely absorbing water and allows the hydrocarbons to diffuse into the cladding, thus generating spectrally specific fingerprint absorption;- An optical system was made with a diode laser as radiation source;- Measurement strategies were investigated and optimised. The laser was tuned very rapidly, and thus probes the spectral features with high speed and sensitivity;- Specific properties of the system components were evaluated, and the system performance was analysed. Programme(s) IC-ISC C - Activity (Euratom, EEC) on cooperation in science and technology, 1984- Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V. Contribution de l’UE Aucune donnée Adresse Heidenhofstrasse 8 79110 FREIBURG (IN BREISGAU) Allemagne Voir sur la carte Coût total Aucune donnée Participants (1) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire VIENNA UNIVERSITY OF TECHNOLOGY Autriche Contribution de l’UE Aucune donnée Adresse 38,Getreidemarkt 9/151 1060 WIEN Voir sur la carte Coût total Aucune donnée
