HTE temperature and gas profile retrieval from combined IR imaging and spectrometer measurements

Abstract

Fourier Transform Spectrometers (FTS) with a high spectral resolution principally allow the retrieval of heigth resolved profiles of temperature and trace gas concentrations. However, they need a comparatively large field of view to gain enough energy to yield a sufficient signal to noise ratio. In case of fire scenes, this results in the contribution of different surface types and fire zones to the measured spectrum. If the area fraction and surface temperature of these contributing surfaces is known from measurements of an imaging sensor with a high spatial resolution operating in the visible and IR spectral ranges, the temperature and gas profiles can be retrieved separately.