NEW METHOD FOR CONTACTLESS TEMPERATURE-MEASUREMENT OF HIGHLY REFLECTING OBJECTS IN OUTDOOR CONDITIONS

A method for contactless temperature measurement using multispectral i nfrared pyrometers was presented by Tank a few years ago. The method w as successfully applied to highly reflecting objects of moderate tempe ratures. Good accuracy was achieved but only for indoor conditions. Th e method assumes that the environment is a blackbody. The assumption c annot be accepted for some industrial cases, especially for outdoor co nditions as the sky radiation does not satisfy the Planck law. A new m ethod acceptable for outdoor conditions has been developed.