An integrated data collection and rapid analysis system was developed which produces temperature maps of gas turbine efflux using Fourier Transform Infrared (FTIR) spectroscopy. The system is purely passive, collecting the infrared radiation from the hot plume gases and requiring no contact with the plume or additional source of infrared radiation. A remotely controlled infrared beam steering mechanism traverses in 2 dimensions, parallel to the direction of exhaust gas flow, positioning the line of sight of a FTIR spectrometer across the plume. Project-specific software integrates the collection of infrared spectra by the FTIR spectrometer (interfacing with the commercial spectrometer software) and analysis of the data utilising a single PC. The plume gas temperatures are calculated by comparison of specific CO2 bands with the radiance of a black body source.

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