Modification of a piezo-optical gas dosimeter system towards continuous gas sensing: a feasibility study with carbon dioxide

Colin, F. and Carter, T.J.N. and Wright, J.D. (2003) Modification of a piezo-optical gas dosimeter system towards continuous gas sensing: a feasibility study with carbon dioxide. Sensors and Actuators B-Chemical, 90 (1-3). pp. 216-221. ISSN 0925-4005. (The full text of this publication is not available from this repository)

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Abstract

We report a feasibility study of monitoring gases continuously by means of an adapted piezo-optical dosimeter system. The test gas is carbon dioxide whose presence is detected via a pH indicator colour change. Sensing spots consist of m-Cresol Purple supported in a buffered ethyl cellulose matrix and deposited on an indium-tin oxide coated piezoelectric film. The change in absorbance is measured via illumination with an amber LED whose peak emission at 592 nm corresponds to the basic form of the reagent. A sensor was developed and calibrated over the range 0-2.5% CO2 of interest for personal monitoring. The 90% response times are 3-4 min but the response rates could be used to trigger an alarm in the first few seconds of CO2 increase. (C) 2003 Elsevier Science B.V. All rights reserved.

Item Type: Article
Additional information: 17 ELSEVIER SCIENCE SA Sp. Iss. SI 668EJ
Uncontrolled keywords: piezo-optical; continuous monitoring; carbon dioxide; occupational monitoring FILM SENSORS; FLUORESCENCE; FLUOROSENSOR; LITHIUM
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 09 Sep 2008 10:01
Last Modified: 14 Jan 2010 14:41
Resource URI: http://kar.kent.ac.uk/id/eprint/10808 (The current URI for this page, for reference purposes)
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