Societe Europeenne De Propulsion

Daniel Hernandez

Michel Clement

Gabriel Olalde

Emmanuel Milcent

The present invention relates to a fast bichromatic pyrometer for measuring the temperature T of a gas or of a moving surface, the pyrometer comprising: a measurement probe placed facing the surface or immersed in the gas and picking up thermal radiation that is characteristic of the temperature of said surface or of said gas; a single optical fiber connected to the measurement probe and transmitting said radiation; an optical block connected to the optical fiber and receiving said radiation, the optical block including inlet collimation means for transmitting all of said radiation, separation means formed by a dichroic slide for separating the transmitted radiation into two distinct spectral bands, and outlet focusing means for concentrating the two separated bands of radiation; a quantum detection circuit receiving said separated bands of radiation and converting them into two color voltages Vr, Vb; and a treatment circuit receiving the voltage signals and including analog-to-digital conversion means, a digital signal processor for calculating the ratio Vr/Vb from these digital values, and memory means provided with a table of predetermined values of T=f(Vr/Vb) as obtained by calibration and delivering at its output, on the basis of the calculated ratio, the temperature T of the surface or of the gas.

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Odeillo, France

Daniel Hernandez