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Gas monitors employing infrared LEDs

Johnston, S.F. (1992) Gas monitors employing infrared LEDs. Measurement Science and Technology, 3 . pp. 191-195. ISSN 0957-0233 (doi:10.1088/0957-0233/3/2/008)

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Abstract

Infrared light emitting diodes (LEOS) can replace the thermal source, bandpass filters and rotating chopper wheel of conventional infrared gas monitors. Their long-term stability, high modulation rate and compact size also provide design advantages. The performance of a family of mid-infrared monitors for measuring carbon dioxide and hydrocarbons is described. Various schemes are outlined for compensating temperature drift, outpullgain fluctuations. changes in cell transparency and mismatch between components.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Johnston, Prof Sean
Authors: Johnston, S.F.
Subjects:Q Science > QC Physics
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TP Chemical technology
College/School:College of Social Sciences > School of Interdisciplinary Studies
Journal Name:Measurement Science and Technology
Journal Abbr.:Meas. Sci. Tech.
Publisher:Institute of Physics Publishing
ISSN:0957-0233

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