Automatic Characterization of Thermoelectric Homogeneity
The advent of high temperature fixed points consisting of metal-carbon eutectie alloys has dramatically reduced thermocouple calibration uncertainties above 1084 ℃ (freezing point of copper). It has also opened up the possibility of calibrating high performance Pt/Pd thermoeouples. Reliable characterization of the uncertainty of high precision thermocouples is critically dependent on a knowledge of all contributions to the measurement uncertainty. The thermoelectric homogeneity is one of the more important components of this uncertainty, particularly at high temperatures. In a previous paper (J.V. Pearce, Measurement Science and Technology. 2007, 18: 3489-3495) a method was described for the determination of the thermoelectric homogeneity of the wires of a thermocouple using a moveable loealised heat source.Here the automation of this procedure is described, and a simplified data reduction procedure is summarized. The new method permits a qualitative (simple analysis) and/or quantitative (more involved analysis) characterization of the thermoelectric profile of the thermoeouple and facilitates a greater understanding of the effects of heat treatment and other exposures to high temperatures on the thermoelectric homogeneity.
Metrology Thermocouples High temperature fized points Contact thermometry
Jonathan V.Pearce
National Physical Laboratory, Teddington, United Kingdom
国际会议
2008年国际温度与热物性测量会议(TEMP BEIJING 2008)
北京
英文
313-319
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）