气体活塞式压力计基准量值传递自动化研究

doi:10.3969/j.issn.1000-1158.2021.10.09

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摘要研制和改进了基于传感器辅助方法的活塞式压力计自动化校准系统,介绍了基于LabVIEW编制的校准软件的组成和功能。通过与传统方法的比对,实验研究了自动校准系统应用于气体活塞式压力计国家基准量值传递工作的可靠性。研究表明,传感器系数γ与1的偏差和相对压差β的乘积小于10^-6时,γ可作为1处理;测量上限为7MPa的反压型气体活塞,全量程和半量程的拟合数据表明活塞的压力形变具有一定的非线性,因此对于高压活塞应进行全量程校准;PG7607活塞底座发热导致0.33 ℃的活塞温度测量误差,由此产生3×10^-6的压力测量误差,对于压力基准是不可忽略的;180kPa、360kPa和3MPa 活塞的2种方法校准结果偏差分别约为标准不确定度的10%、1%和2%,验证了自动化校准系统的高可靠性。

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关键词 ：计量学, 活塞式压力计, 压力基准, 传感器辅助压力平衡, 自动化校准, LabVIEW软件

Abstract：Based on the transducer-aided crossfloat (TAC) method, an automated calibration system for piston gauges has been developed and improved. The components and function of the calibration software based on the LabVIEW are introduced. The reliability of applying the automated calibration system on the dissemination of primary standard for pneumatic piston gauges is studied by comparison test against the traditional crossfloat method (CF). The transducer coefficient (γ) could be treated as 1 if the deviation is so small that the product of the deviation and the relative pressure difference (β) is less than 10^-6. For the counter-pressure pneumatic piston gauges with the measurement upper limit of 7MPa, the fitting data of the full-scale and half-scale indicate that the pressure deformation of the piston has a certain degree of nonlinearity, so full-scale calibration should be carried out for the high-pressure piston; The thermal effect of the PG7607 piston base causes a piston temperature measurement error of 0.33 ℃, resulting in a pressure measurement error of 3×10^-6, which is non-negligible for the primary standard; The calibration results for the 180kPa, 360kPa and 3MPa piston gauges determined by the automated system and the traditional method differ from each other are about 10%, 1% and 2% of the standard uncertainty, which verify the high reliability of the automated calibration system.

Key words： metrology piston gauge primary pressure standard transducer-aided crossfloat automated calibration LabVIEW software

收稿日期: 2020-05-29 发布日期: 2021-10-18

PACS:

TB935

基金资助:国家重点研发计划(2019YFB2006601);中国计量科学研究院基本科研业务费(26-AKYZZ2007);湖南省市场监督管理局科技计划(2021KJJH57)

通讯作者: 杨远超(1983-),男,湖北公安人,中国计量科学研究院副研究员,博士,主要从事压力与真空计量研究。Email:yangyc@nim.ac.cn E-mail: yangyc@nim.ac.cn

作者简介: 曾麟(1985-),男,瑶族,湖南洞口人,湖南省计量检测研究院高级工程师,主要从事压力计量科学与技术研究。Email:275730021@qq.com

引用本文:

曾麟,杨远超,悦进,黄谦. 气体活塞式压力计基准量值传递自动化研究[J]. 计量学报, 2021, 42(10): 1316-1322.
ZENG Lin,YANG Yuan-chao,YUE Jin,HUANG Qian. Research on Automated Dissemination of Primary Standard for Pneumatic Piston Gauges. Acta Metrologica Sinica, 2021, 42(10): 1316-1322.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.10.09 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I10/1316

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