On-line Magazine 'Sensors & Transducers' (S&T e-Digest)
(ISSN 1726- 5479)
Vol. 40, Issue 2, January 2004, pp. 128-136
A Flowmeter for Measurements of Very Small Gas Flows
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
2Department of Industry Electronics, ul. Długa 44/50, 00-241 Warszawa, Phone (+48) 22 8315221 Fax (+48) 22 8313014, Poland
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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