《一种精确的表面温度测量系统英文文献》.pdf

IEEE TRANSACTIONS ON INDUSTRY AND GENERAL APPLICATIONS, VOL. IGA-6, NO. 1, JANUARY/FEBRUARY 1970 43 An Accurate Surface Temperature Measuring System DONALD ROBERTSON, MEMBER, IEEE, AND GERALD A. STERBUTZEL Abstract-A system is described that provides accurate contact surface-temperature measurement that is free from conduction THERMOCOUPLE 1 ,INSULATION HEATER 0 /,,,,/// / TC -2 error and heat perturbation of the measured surface. The prin- THERMOCOUPLE 2 -11TC HEATER ciple is one of null heat flow provided by an electronically servoed backup heater. The probe consists of three basic parts: a measuring MEASURED SURFACEI / contact thermocouple, a differential thermocouple, and a heater, mounted in tandem. The measuring junction and one junction of the Fig. 1. Temperature sensor. differential couple contact the surface. The second differential junction is located a short distance behind the first junction so as to have a thermal path between the junctions. The backup heater is II. PRINCIPLE located behind the second junction. When the probe contacts a Pyrometrists have long been confronted by design com- surface that is above probe temperature, the first differential junc- promises in installing contacting or permanently mounted tion rises in temperature above the second junction, producing an EMF which is fed into the electronic servo. This signal is amplified, sensors. In general, when using conventional probes, and quickly energizes the electric