The innovative approach of the temperature measurement is based on non-contact sensor like infrared cameras due to the heated zone access limitation and the weak disturbance in heat transfer. The technology provide measurements of a thermal field at high speed (few ms.) and giving a high thermal (100mK) and spatial (1/1000 of the observed scene) resolution. However, it provide only apparent black body temperature measurements (or radiance ones). The measurement are different from true ones as many as the surface emissivity is not equal to one and the 3D shape of the observed objects is not planar. The contextual factors have an influence on the measurement and have to take into account. True temperatures are then provided by these corrections, typically computed off line from information given by literature or by a preliminary calibration step. The project is intended to design a new optoelectronic imaging device for measuring on line the true temperature field of a tri-dimensional object, at high temperature (500-1200°C) and with an accuracy less than +/- 10°C. The device will be able to fuse on line measurements of apparent temperature, emissivity and 3D shape using a single sensor based upon InGaAs cameras operating in Near Infrared spectral band (0,8- 1,7µm).It will be mandatory to tackle with several scientific and technological challenges: - Radiometric and geometric calibration of new generation of InGaAs cameras, - Near infrared and real time 3D reconstruction,- Emissivity field measurement,- the coupling between stereovision, thermal vision and emissivity measurement,- and finally, the integration of these functions in a single device to be used on line. Four research teams from Computer and Engineering Sciences will collaborate in the project. At first, the CROMeP-Armines laboratory (Research Centre on Tools, Materials and Forming Processes, of the Mining School of Albi-Carmaux) has initiated a research project since 2002 on Near Infrared thermography. The main issue consists in developing a low-cost system based on silicon cameras, suitable for the measurement of thermal radiance field. The LAAS-CNRS laboratory (Laboratory on Analysis and Architecture of Systems), located in Toulouse, has developed an expertise in 3D geometrical modelling. Moreover, the PROMES-CNRS laboratory (Procédés Matériaux et Énergie Solaire) has developed non destructive measurement methods of the thermal and optical properties of materials. Finally, the AREVA technical centre has developed infrared measurements in their facilities.Thanks to their research complementary work, the laboratories involved in this project will be able to deal with the problems related to the on line acquisition of TRUE measurements of a dense thermal field by fusing data regarding apparent temperature, 3D shape and emissivity. The result will be the prototype of a optoelectronic device integrating two InGaAs cameras operating in Near Infrared spectral band in order to measure both the apparent black body temperature and the 3D shape and active device of pyroreflectometry in order to acquire dense emissivity maps. The steps will be considered: a. Measurements in reference situations : the radiometric calibration will be performed with an ideal black body; their geometric calibration will be performed with a planar infrared target: emissivity measurement with selected materials in the project and in Areva facilities. b. True temperature measurement on a rigid object with a simple 3D shape and a uniform emissivity (punctual emissivity measurement) fusing information on apparent temperature and 3D shape, using a single stereovision sensor. As a validation, the acquired temperatures will be compared with reference temperatures measured with thermocouples. c. same scenario, but with an object with a variable shape and a non uniform emissivity (study of a potential motion control of the sensor and acquisition of a dense emissivity map), d. same scenario, but in dynamic situations with a sequence of time-varying of images of an object undergoing temperature variations. e. Experiments will be carried out at Areva technical centre.