热膨胀
法布里-珀罗干涉仪
大气温度范围
材料科学
压力测量
热的
光学
分析化学(期刊)
复合材料
化学
热力学
光电子学
物理
波长
色谱法
作者
Kayan Ma,Yuanchao Yang,Xiaoqiang Feng
出处
期刊:Vacuum
[Elsevier]
日期:2024-03-01
卷期号:221: 112861-112861
标识
DOI:10.1016/j.vacuum.2023.112861
摘要
Fabry–Pérot cavity (FPC) refractometer based optical pressure standard (OPS) is very promising for a new realization of the pascal in the range 1 Pa–100 kPa. Although FPCs are made using ultra-low-expansion glass, cavity baseline (frequency) shifts due to temperature changes caused by gas pumping and filling are still a crucial factor limiting the accuracy of the OPS developed at the NIM of China at the low-pressure end. In this study, the baseline shift in the NIM-OPS is eliminated by setting the working temperature at the zero-thermal-expansion (ZTE) point, which is determined by measuring the coefficient of thermal expansion (CTE) of the FPC, in the temperature range 23–40 °C. CTE measurements are obtained under a background vacuum, and also under the condition of remaining gas in order to minimize the temperature gradient. The performance of the OPS for low-pressure measurements is investigated at 30.1 °C used previously and the determined ZTE temperature of 36.8 °C. An indirect comparison between the OPS and a static expansion system is performed at 1 Pa using a capacitance diaphragm gauge as the transfer standard. The disagreement of ∼ 254 mPa at 30.1 °C is reduced to within 10 mPa at the ZTE temperature.
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