Method for non-contact measurement of the temperature of an object regardless of the value of its emissivity, reflection or transmission coefficients

Abstract

The method of non-contact measurement of the temperature of an object, regardless of the value of its emissivity, reflection or transmission, is characterized in that the tested object is passed through the measuring chamber (B) or placed inside this measuring chamber in which there is an opening or window enabling the observation of the tested object or its fragment and a fragment of the inner surface of the chamber visible behind this object, using at least one infrared detector, wherein this inner surface has the same temperature in every point, adjustable in the range from 1°C to 2000°C and the value of the emissivity coefficient above 0.5, preferably close to one, at the same time the measurement is started with at least one infrared radiation detector, and then the temperature of the inner surface of the chamber is changed by passing the tested object through this chamber or keeping it inside it until,in which the signal from the infrared radiation detector directed at this surface reaches the same value as the signal from the infrared radiation detector directed at the tested object placed in the measuring chamber or passed through this measuring chamber, in which tested object or point of the tested object the infrared radiation from the interior of the chamber is reflected towards the detector and the temperature of the tested object is read as equivalent to the temperature of the surface of the interior of this chamber,

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