Two new total radiation pyrometers

The measurement and control of temperature are basic to all industrial processes. Modern automatic machinery exploits the economy achieved by a continuous flow of product. Such machinery requires instrumentation capable of measuring the temperature of moving material in process for maximum efficiency. Total radiation pyrometers are useful for this purpose, and there is a continuing demand from industry for more sensitive, accurate, and versatile instruments. This paper describes two new pyrometers* applicable to a wide variety of industrial and laboratory measurements. They combine good spectral response, high sensitivity, and rapid response, with stability and accuracy adequate for most requirements. These factors are discussed in relation to the design of the pyrometers. The basis for transferring a radiation measurement to a temperature by calibration and some of the limitations involved are also considered.