High-accuracy stable gas flow dilution using an internally calibrated network of critical flow orifices

被引：18

作者：

Brewer, P. J. ^{[1
]}

Goody, B. A. ^{[1
]}

Gillam, T. ^{[2
]}

Brown, R. J. C. ^{[1
]}

Milton, M. J. T. ^{[1
]}

机构：

[1] Natl Phys Lab, Analyt Sci Div, Teddington TW11 0LW, Middx, England

[2] Univ Oxford Merton Coll, Oxford OX1 4JD, England

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2010年 / 21卷 / 11期

关键词：

gas metrology; gas flow dilutor; critical flow orifice; UNCERTAINTY; STANDARDS;

D O I：

10.1088/0957-0233/21/11/115902

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A network of critical flow orifices has been developed to form a gas flow dilutor capable of stable and repeatable operation, which is not influenced by environmental conditions. When used with a novel self-calibration method it achieves dilutions of up to 31:1 with a relative standard uncertainty of +/- 0.1%. This new approach avoids the uncertainty generated by setting and controlling the flow which is present in devices based on variable flow elements.

引用

页数：8

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