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2003 S&T e-Digest Contents


Vol. 40, Issue 2, January 2004, pp. 128-136




A Flowmeter for Measurements of Very Small Gas Flows

Mariusz R. Rząsa1, Jan Sawicki2

1Department of Thermal Engineering and Industrial Apparatus, Technical University of Opole,

ul. Mikołajczyka 5, 45-233 Opole, Poland, Phone (+48) 77 4006370 Fax (+48) 77 4006139

E-mail: mrz@po.opole.pl

2Department of Industry Electronics, ul. Długa 44/50, 00-241 Warszawa, Phone (+48) 22 8315221 Fax (+48) 22 8313014, Poland

E-mail: pie@pie.edu.pl



Received: 15 December 2003   /Accepted: 14 February 2004   /Published: 20 February 2004


Abstract: The paper presents description of a flow meter for measurements of very small gas flows (some or several ml/min). Low elementary volumes of gas are counted.  The elementary volumes are generated as gas bubbles located in a liquid. In the applied method of measurement of the bubble volume, a vertical column is subjected to a homogeneous light beam, next a luminous flux is detected by a set of optical wave-guide detectors. Detection enables to find a bubble and determine its dimensions. Finally, signals from the detectors are changed into electric signals in the measuring converters and they are registered in a computer.


Keywords: gas flow, optical method, optical tomography


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