Tomographische Rekonstruktion von Gefahrstoffwolken mittels abbildender Infrarotspektroskopie (English shop)

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When hazardous substances are released in chemical accidents, emergency responders in civil protection must rapidly determine the type, quantity and dispersion of the substances. The method of remote sensing by means of infrared spectroscopy permits the analysis of hazardous substance clouds from large, safe distances. In order to localise a hazardous substance cloud and determine its structure, a procedure for the tomographic reconstruction of the spatial concentration distribution of gas clouds has been developed. In this approach, two projections of the hazardous substance cloud are measured from different positions by means of imaging infrared spectroscopy and evaluated. In the first step, a discrete structural model of the hazardous substance cloud is created on the basis of the geometry specific to the respective measurement deployment. Subsequently, the concentration in the individual discrete elements of the model is determined by evaluating the projections using an iterative reconstruction algorithm. The results include the position, extent and dispersion direction of the cloud as well as the distribution of the hazardous substance. The reconstructed cloud can be displayed as a three-dimensional object in a geographic information system, enabling emergency responders to make a differentiated assessment of the hazard situation in the event of a disaster. The reconstruction procedure has been successfully applied in the context of field measurements of industrial emissions.