IMAGING INDOOR TRACER-GAS CONCENTRATIONS WITH COMPUTED-TOMOGRAPHY - EXPERIMENTAL RESULTS WITH A REMOTE-SENSING FTIR SYSTEM

This work demonstrates for the first time the feasibility of computed tomography (CT) reconstructions of pollutant concentrations in a real room setting. A remote sensing Fourier transform infrared spectrometer was mounted on a moving base in a controlled ventilation chamber. A p assive tracer was released from a point source into the room under con stant ventilation conditions. A series of experiments gathered multipl e path-averaged measurements in a two-dimensional plane for CT reconst ruction. Simultaneous readings were gathered with a multiple-point sam pling array for later comparison to the CT reconstructed concentration s. Good qualitative agreement between the reconstruction and point sam ple data was obtained. Limitations encountered due to the temporal res olution, size, and geometry of the experimental apparatus are clearly surmountable with better instrumentation.