标准气体气瓶体积膨胀的精确测量

doi:10.3969/j.issn.1000-1158.2021.10.20

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摘要目前普遍采用称量法制备标准气体,在此过程中气瓶体积膨胀所引入的空气浮力的不确定度贡献不可忽视。设计了一个气瓶充气膨胀率测量装置,该装置可以控制气瓶内充入气体的压力,并利用精密移液管测量气瓶体积的膨胀量,从而准确计算出气瓶的充气膨胀率。利用该装置对国内常见的2L、4L和8L铝合金气瓶进行了测量,结果显示气瓶体积的膨胀与充入气体的压力近似成线性正相关。而且气瓶外观体积越大,充气膨胀率的数值越大,量值之间也呈现出较强的相关性。基于获得的气瓶充气膨胀率数据,可以进一步降低气瓶体积膨胀对瓶内充入气体质量的不确定度贡献,从而使气体质量的计算更加精确。

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	王德发
	吴海
	黄鹏
	王振
	王漫
	刘智勇
	冯和平
	韩桥

关键词 ：计量学, 标准气体, 气瓶, 称量法, 体积膨胀, 不确定度

Abstract：At present, the Gravimetric method is widely used to prepare standard gas. In the process, the uncertainty contribution of air buoyancy introduced by cylinder volume expansion can not be ignored. A device for measuring the gas-filling expansion rate of cylinder is designed. The device can control the pressure of gas filled in cylinder, and measure the volume expansion of cylinder by a precise pipette, so as to accurately calculate the gas-filling expansion rate of cylinder. By using the device, the common 2L, 4L, and 8L aluminum alloy gas cylinders in China are measured. The results show that the expansion volume of cylinder is approximately linearly related to the gas pressure in the cylinder. Moreover, the larger cylinder appearance volume is, the larger gas-filling expansion rate is, and there is a strong correlation between cylinder appearance volume and gas-filling expansion rate. Based on the obtained gas-filling expansion rate data of cylinder, the contribution of cylinder volume expansion to the mass uncertainty of gas filled in cylinder can be further reduced, thus making the calculation of gas mass more accurate.

Key words： metrology standard gas cylinder gravimetric method volume expansion uncertainty

收稿日期: 2020-01-31 发布日期: 2021-10-18

PACS:

TB99

基金资助:国家重点研发计划(2016YFF0201101);国家质检总局量传项目(ALC1405);中国计量科学研究院基本业务费项目(AKY1327)

作者简介: 王德发(1977-),男,辽宁抚顺人,中国计量科学研究院副研究员,主要从事气体标准物质、气体定性定量精确测量方法的研究工作。Email: wangdf@nim.ac.cn

引用本文:

王德发,吴海,黄鹏,王振,王漫,刘智勇,冯和平,韩桥. 标准气体气瓶体积膨胀的精确测量[J]. 计量学报, 2021, 42(10): 1393-1397.
WANG De-fa,WU Hai,HUANG Peng,WANG Zhen,WANG Man,LIU Zhi-yong,FENG He-ping,HAN Qiao. Accurate Measurement of Volume Expansion of Standard Gas Cylinder. Acta Metrologica Sinica, 2021, 42(10): 1393-1397.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.10.20 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I10/1393

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