Processes for the remote measurement of the emissivity and/or the true temperature of a body with relatively smooth surface

摘要

A process for the remote measurement of the emissivity &egr; of a body (1) with relatively smooth surface, consisting: in making, with a detector (6) and a converter (9), a first measurement A of the luminance at a point M on the surface at an emission angle &thgr;, the thermal radiation (2) on which the measurement is made being polarized (at 4) in a first direction with respect to the emission plane, in making a second measurement B of the luminance at the same point and at the same emission angle &thgr;, the thermal radiation being polarized in a second direction, different from the first one, finally, in determining the emissivity ##EQU1## &thgr;.sub.1 being the angle of the axis of the polarizer for A and &thgr;.sub.2 being the angle of the axis of the polarizer for B, measured with respect to a polarization perpendicular to the emission plane.