圆柱形声学气体温度计

IF 4.4 2区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
L. Xing, Xiao-Juan Feng, Ming-Hao Si, Jin-Tao Zhang, Hong Lin, K. Gillis, M. Moldover
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引用次数: 1

摘要

我们回顾了最近使用圆柱声气体测温(c-AGT)测定玻尔兹曼常数kB和T - T90的差异。这些测定测量了围在金属壁圆柱形腔内的氩气的声共振频率。(T为热力学温度,T90为1990年国际温标(ITS-90)测量的温度。)在234 ~ 303 K范围内,c-AGT的标准不确定度为1.9 × 10−6T ~ 2.6 × 10−6T。这种不确定度比ITS-90中的误差小得多;因此,c-AGT可以帮助改善ITS-90。此外,我们正在将c-AGT扩展到1358 K。随着温度的升高,c-AGT相对于基于准球腔的AGT具有优势,因为长圆柱形腔(1)自然适合于圆柱形热管或多壳恒温器;(2)提供传递温度标准所要求的浸渍,如长柄铂电阻温度计;(3)具有更有用的低频声学共振。在制备高温c-AGT的过程中,我们确定了用于制造圆柱腔的合适材料,并开发了使用高温恒温器外的源和探测器测量声共振频率的技术。我们还考虑了替代测试气体和最佳尺寸的空腔。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cylindrical Acoustic Gas Thermometry
We review recent determinations of the Boltzmann constant kB and the differences T − T90 that used cylindrical acoustic gas thermometry (c-AGT). These determinations measured the acoustic resonance frequencies of argon gas enclosed by metal-walled, cylindrical cavities. (Here, T is the thermodynamic temperature and T90 is the temperature measured on the International Temperature Scale of 1990, ITS-90.) In the range 234–303 K, the standard uncertainty of c-AGT ranges from 1.9 × 10−6T to 2.6 × 10−6T. This uncertainty is much smaller than the errors in ITS-90; therefore, c-AGT can help improve ITS-90. Moreover, we are extending c-AGT up to 1358 K. With increasing temperatures, c-AGT becomes advantageous relative to AGT based on quasi-spherical cavities because long cylindrical cavities (1) naturally fit into cylindrical heat pipes or multi-shelled thermostats; (2) provide the immersion required by transfer temperature standards, such as long-stemmed platinum resistance thermometers; and (3) have more useful, low-frequency acoustic resonances. In preparation for high-temperature c-AGT, we identified suitable materials for fabricating cylindrical cavities and we developed techniques for measuring acoustic resonance frequencies using sources and detectors outside the high-temperature thermostat. We also considered alternative test gases and optimal dimensions of cavities.
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来源期刊
CiteScore
6.90
自引率
11.60%
发文量
14
审稿时长
>12 weeks
期刊介绍: The Journal of Physical and Chemical Reference Data (JPCRD) is published by AIP Publishing for the U.S. Department of Commerce National Institute of Standards and Technology (NIST). The journal provides critically evaluated physical and chemical property data, fully documented as to the original sources and the criteria used for evaluation, preferably with uncertainty analysis. Critical reviews may also be included if they document a reference database, review the data situation in a field, review reference-quality measurement techniques, or review data evaluation methods.
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