An instrument consisting of a reaction chamber with separate inlets for the sample
gas, an optical filter
, a photomultiplier and a signal processing device. The reactive gas is introduced
in excess. The quantity of light produced is proportional to the sample flow rate
and the concentration of the measured substance in the sample under specified temperature
and pressure conditions. The filter
limits the wavelength
to the region of interest and helps to eliminate interferences.
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2179
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook