Infrared thermometers measure the amount of infrared energy emitted by an object’s surface,and then convert this signal into a temperature value. While many factors affect the measurement accuracy, the most important consideration is the selection of the sensor design that most effectively compensates for the emissivity characteristics of the measured surface. Emissivity is a measure of the amount of infrared energy emitted from a surface relative to its theoretical maximum for a given temperature. Successful temperature measurement of ‘non-greybody’materials, such as aluminum,requires the use of a multi-wavelength sensor to compensate for the complex emissivity characteristics of these materials. For example, aluminum emissivity variations occur with changes in alloy, surface oxidation, surface texture, surface contamination, and crystal structure.
AST has a unique line of proprietary pyrometers that use a totally new approach for accurate temperature measurement. These proprietary pyrometers provide highly accurate, non-contact temperature measurement of true target emissivity and intermediate chese products are not sensitive to changes in emissivity or other target parameters and are not affected by the intermediate conditions between the pyrometer and the target. As a result, AST’s pyrometers are capable of handling the unstable targets and intermediate conditions commonly found in the aluminum indicating the target temperature to a high degree of accuracy.