Multi-wavelength pyrometer

Details Multi-wavelength pyrometer Multi-wavelength pyrometer

G - Physics

01

J

G01J 5/60 (2006.01)

Patent

CA 2067248

The invention relates to a multiwavelengths pyrometer for measuring the temperature and emission rate of a surface above 900 K. This pyrometer contains several radiation detectors which are sensitive to different wavelengths .lambda.l....lambda.i....lambda.n and a data processor which receives the output signals of the radiation detectors after digitalization, and deduces therefrom, by means of the Wien-Planck law, the temperature, assuming that the surface is an ideal black body. Then, the emission rate is computed from these temperature values according to an approximation law as a function of temperature and the wavelength, and from this the desired temperature is computed. According to the invention, the differences between the pyrometer signals and the pyrometer signals to be expected due to the assumed emission rate and the desired temperature deduced therefrom are computed for several of the approximation laws and the different wavelengths and then that approximation law is selected which represents for all wavelengths the lowest sum of the squares of these differences and the highest precision of temperature and emission rate.

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