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Temperature variation correction for aspirating probes in helium–air mixtures

M Cabannes1, M Ferchichi2 and S Tavoularis1

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An empirical correction procedure for the temperature sensitivity of hot film, aspirating probes in helium–air mixtures has been established. It has been demonstrated experimentally that, within the full concentration range and a fairly wide temperature range, the concentration and temperature sensitivities are decoupled. The procedure consists of calibrating the probe in mixtures of varying concentration under a constant reference temperature and then applying a correction to the probe voltage output that takes into account the difference between the flow and reference temperatures. This correction was found to be proportional to the temperature difference.


PACS

82.80.-d Chemical analysis and related physical methods of analysis

Subjects

Chemical physics and physical chemistry

Dates

Issue 6 (June 2004)

Received 23 February 2004

Published 18 May 2004



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