A method for multi-wavelength radiation pyrometry measuring emission and reflection simultaneously and remotely.

概要

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New algorithm is presented for the development in radiation pyrometry with high accuracy and precision. A pyrometer is designed on a basis of the algorithm. The algorithm and the pyrometer are examined experimentally to verify the performance.The pyrometer measures emission and reflection of a target surface at three near-infrared wavelength points simultaneously and remotely. The data are analyzed on a rigorous consideration for the angular characteristics of reflection. We present an idea, which approximates the spectral dependence of the angular characteristics of reflection as wavelength-independent or with a simple series expansion form of wavelength. A least-squares technique is combined with it to reduce the difficulty in the approximation and the experimental errors.The pyrometer is examined in the temperature measurement of an oxidizing metal surface at high temperatures, whose spectral and angular characteristics are complicated and changing transiently. The inaccuracy is found to be less than 10K/1000K for this most difficult case.
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