|
|
Disseminating the International Temperature Scale above 961.78 ℃ in the “Fixed point-Pyrometer” Method |
LU Xiao-feng, YUAN Zun-dong, WANG Jing-hui, BAI Cheng-yu, DONG Wei, HAO Xiao-peng, WANG Tie-jun |
National Institute of Metrology, Beijing 100013, China |
|
|
Abstract The high-temperature primary standard system was gradually improved through the continuing research work at the National Institute of Metrology (NIM) in China. Based on the developed primary standard pyrometer, an improved scheme, the “fixed-point blackbody pyrometer” assembly, was applied to realize and disseminate the International Temperature Scale of 1990 (ITS-90) above the silver point. The new scheme can correct the drifts of the pyrometer and extend the highest temperature range from 2 200 ℃ to 2 474 ℃. The expanded uncertainties of the scale were 0.08~0.62 ℃ between the temperature range 961.78~2 474 ℃.The uncertainties of the temperature scale are strongly supported by the international comparison of the high temperature fixed points’ ITS-90 values among China, the U K and Spain in 2009. The new method could be not only applied in the highest level calibration of the precise pyrometers, but also in the calibration of the 900 nm infrared thermometers.
|
|
|
|
|
[1] 赵琪,原遵东,王京平,等.用于新温标ITS-90的直流光电温度比较仪[J].计量学报,1990,11(4):241-247.
[2] 原遵东,段宇宁,王铁军,等.复现银凝固点以上国际温标(ITS-90)[J]. 现代计量测试, 2001,(2):13-20.
[3] 卢小丰,原遵东,柏成玉,等. 基准光电高温计的光谱响应度测量[J]. 计量学报, 2007,28(3A):65-68.
[4] 段宇宁,赵琪,原遵东,等.辐射源尺寸效应研究[J].计量学报,1996,17(3):161-166.
[5] 董伟,原遵东,卢小丰. 基于发光二极管光源的光电高温计非线性研究[J]. 光学学报, 2010,30(8):2412-2416.
[6] Yoon H W, Allen D W, Saunders R D. Methods to Reduce the Size-of-Source Effect in Radiometers[J]. Metrologia,2005, 42(2):89-96.
[7] Sakuma F, Ma L, Yuan Z.Distance effect and size-of-source effect of radiation thermometers [C]//Proceedings of 8th International Symposium on Temperature and Thermal Measurements in Industry and Science,Berlin, 2001.
[8] 段宇宁,原遵东,赵琪. 新型辐射银点炉的研制[J]. 计量学报,1995,16(4):241-245.
[9] 原遵东,赵琪,段宇宁,等.新型精密光温计[J]. 计量学报,2003,24(4):257-261.
[10] Yuan Z, Wang T, Lu X, et al. T90 Measurement of Co-C, Pt-C, and Re-C High-Temperature Fixed Points at the NIM [J]. Int J Thermophys, 2011, 32(7): 1744-1752.
[11] Machin G, Dong W, Martin M J, et al. Estimation of the degree of equivalence of the ITS-90 above the silver point between NPL, NIM and CEM using high temperature fixed points [J]. Metrologia,2011,48(3): 196-200. |
|
|
|