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使用圆柱形共振器在高达809K的温度下进行声气温度计的进展

Liu Xu¹, Xiaojuan Feng¹, Jintao Zhang¹

¹National Institute of Metrology China , Beijing, People's Republic of China.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

|January 15, 2026

概括

声气温度计扩展到809K,以准确测量热力学温度. 温度计的这种进步为1990年国际温度尺度 (ITS-90) 提供了较低的不确定性.

科学领域:

计量学计量学计量学
热力学是一种热力学.
物理化学物理化学

背景情况:

准确的温度测量对于科学和工业应用至关重要.
1990年国际温度尺度 (ITS-90) 要求精确的热力学温度实现.
声气体温度计 (AGT) 为高精度温度测定提供了一个潜在的途径.

研究的目的:

将声气温度计 (AGT) 扩展到高温 (高达809K).
测量热力学温度 (T) 和ITS-90温度 (T90) 之间的差异,不确定性很低.
为了评估在高温下振荡器系统的结构稳定性.

主要方法:

使用了Ni-Cr-Fe合金圆柱形振荡器,配有集成的声学和微波波导.
采用连续的纯气流来最大限度地减少墙壁脱吸效应.
测量了从580K到809K的声学共振频率和微波共振频率.
应用了对声频的二级边界层校正.

主要成果:

在中进行声学测量时,获得了 (3-5) × 10-6的相对标准不确定性.
测量了微波共振频率,相对标准不确定性为3×10-7.
观察到809K的微波模式不一致性为2.2×10-6,为T确定贡献3.6mK的不确定性.
证明了不一致的温度独立性,表明共振器的结构稳定性高达809K.

结论:

声气温度计成功扩展到809K,不确定性很低.
该研究为热力学温度尺度的实现提供了有价值的数据.
响应器的结构稳定性可确保在广泛的温度范围内进行可靠的测量.

关键词:

声学气体温度计声学气体温度计一个圆柱形的共振器.高温的高温的高温的高温微波共振是一种微波共振.热力学温度温度的热力学温度.

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