Imagerie infrarouge thermique haute résolution : potentiels et limitations pour la géologie

Abstract : Thermal infrared (7.5-14 μm) enables the measurement of temperature far fromgeological surfaces. Microbolometers devices are increasingly used in the field in order to mapthermal anomalies. However, phenomena such as atmospheric opacity and surface reflections disturb the electromagnetic signal. In addition, images have to be geometrically adjusted to fit with geographical models. A processing chain is here suggested in order to correct the radiometry and the geometry of images, and the uncertainties are computed. Then, its potential and limitations are considered, through a few examples. First, it has been used in order to detect the waterline evolution of a mud shore during a rising tide, which enables to reconstruct a digital elevation model. Then, a computer model has been developed to study the roughness effects on the surface temperature and on the thermal inertial calculation on Mars and on the (2867) Šteins asteroid. Finally the heat flux of a sub-fumarolian zone has been computed in La Soufrière volcano (Guadeloupe, Lesser Antilles).Thus, thermal infrared remote sensing is very useful in quantitatively mapping the temperatures anomalies with a high resolution. High frequency studies should enable the survey of geological phenomena.
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Damien Gaudin. Imagerie infrarouge thermique haute résolution : potentiels et limitations pour la géologie. Sciences de la Terre. Université de Bretagne occidentale - Brest, 2012. Français. ⟨NNT : 2012BRES0076⟩. ⟨tel-01365952v2⟩

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