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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Detection and characterisation of buried objects using infrared thermography enhanced by microwave heating

Arnaud Jacotin
Onera - Centre de Toulouse Département Modèles pour l'Aérodynamique et l'Energétique 2, Avenue Edouard Belin B.P 4025 31055 Toulouse cedex 4 - France

Elodie Bachelier
Noveltis, Parc technologique du canal, 2 avenue de l'Europe, 31520 Ramonville St Agne.

Francois Liousse
Onera - Centre de Toulouse Département Modèles pour l'Aérodynamique et l'Energétique 2, Avenue Edouard Belin B.P 4025 31055 Toulouse cedex 4 – France

Pierre Millan
Onera – Centre de Toulouse Département Modèles pour l'Aérodynamique et l'Energétique 2, Avenue Edouard Belin B.P 4025 31055 Toulouse cedex 4 – France

DOI: 10.1615/IHTC12.4210
7 pages

Abstract

Heterogeneity due to buried objets in thermal characteristics of stimulated soil induces contrasts at the surface. Hence, from the time evolution of the surface temperatures, buried objects characteristics can be retrieved. Since climate generated contrasts are quite low and are highly weather dependent, microwave enhancement is an active way to induce and thus control higher thermal contrasts. Since measuring meteorological data is not so easy, not only efficiency but also accuracy is slightly improved. In practice, retrieval of subsurface thermophysical properties from surface measurements requires an inverse technique. This means both numerical and experimental approach. In situ data are recorded and fitted with numerical simulations by optimising parameters to identify. First of all, a direct numerical model is needed whose results will enable to validate the feasibility of the method. Secondly, the optimisation technique will be performed and final in situ experiments will then be carried out. In this present paper only a direct model evaluation is presented.

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