Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1995-10-20
1998-05-26
Biegel, Ronald L.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
738665, G01J 508
Patent
active
057555109
ABSTRACT:
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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Clement Michel
Hernandez Daniel
Milcent Emmanuel
Olalde Gabriel
Biegel Ronald L.
Societe Europeenne de Propulsionm
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