If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Signal-to-Noise Comparison of Flame/Furnace Infrared Emission (FIRE) Spectrometry with Room-Temperature, Nondispersive Infrared Absorption Spectrophotometry

$29.00 plus tax (Refund Policy)

Buy Article:


A theoretical model has been developed for the comparison of the performance of a detector-noise-limited, flame infrared emission (FIRE) spectrometer with that of a room-temperature, nondispersive, infrared absorption (NDIR) spectrophotometer. The ratio of the signal-to-noise ratio (SNR) in emission to that in absorption is found to depend on the product of five terms: (1) the ratio of the noise in absorption to that in emission; (2) the ratio of the solid angles in emission and absorption; (3) the ratio of the pathlengths in emission and absorption; (4) the ratio of the number densities in emission and absorption; and (5) the ratio of the Boltzmann factor for the flame to the Bose-Einstein factor for the blackbody source. Implications for gas chromatographic detection are considered. Under conditions in which chemical conversion of the sample into an infrared-active species is not required and both measurements employ an uncooled PbSe detector, a sample cell volume of 30 μL, and a filter bandwidth of 0.30 μm at a wavelength 4.35 μm (the antisymmetric stretching vibration of CO2), the major factor which determines the ratio of the two SNRs will be the ratio of the solid angle × pathlength product, which has a constant value of 100, regardless of the sample cell pathlength chosen. If a hydrogen/air flame is used in emission (2272 K) and a Nernst glower is used in absorption (1800 K), the FIRE spectrometer is predicted to produce an SNR that is at least 19 times better than that produced by the corresponding NDIR absorption photometer, regardless of the pathlength of the absorption cell.

Keywords: Flame/furnace infrared emission spectrometry; Gas chromatography detectors, infrared; Infrared emission spectrometry; Nondispersive, infrared absorption spectrophotometry; Signal-to-noise comparison, infrared emission and absorption

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934415138

Affiliations: Department of Chemistry, P.O. Box 97348, Baylor University, Waco, Texas 76798-7348

Publication date: July 1, 1993

More about this publication?
Related content



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more