Problems in High Temperature Thermometry

The discussion is presented under the following subject headings: temperature and temperature scales; calibration tactics; resistance thermometry; thermocouple thermometry; pyrometry; and other types of thermometers. The discussion is concerned primarily with temperature measurement problems above 500/sup 0/C, except in a few instances where problems at lower temperatures may affect the high temperature results. The upper limit of temperature measurement problems discussed is 3000/sup 0/C, as this is the normal maximum use temperature of the techniques included in this review. Problems in applied temperature measurements, rather than in standards, are considered, and emphasis is placed on problems due to high temperature limitations of materials in the thermometer sensors. 199 references. (JGB)