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Simultaneous Measurements of CO2 and CO Using a Single Distributed-Feedback (DFB) Diode Laser Near 1.57 μm at Elevated Temperatures

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Abstract:

A sensor using a single distributed-feedback (DFB) diode laser at 1.57 μm for the simultaneous measurement of CO2 and CO concentration at elevated temperatures is developed. A proper line pair near 6361.250 and 6361.344 cm–1 is chosen based on absorption strength, separation of the two lines, and isolation from interference of neighboring transitions of the major combustion gases. The concentrations of CO2 and CO are inferred from their wavelength modulation spectroscopy (WMS) 1ƒ-normalized absorption-based WMS-2ƒ signal peak heights. The CO2 and CO concentration measurements are within 3.3% and 5% of the expected values over the full temperature range.

Keywords: CO; CO2; CONCENTRATION; ELEVATED TEMPERATURE; INDEX HEADINGS: DIODE LASERS; WAVELENGTH MODULATION SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/10-06074

Affiliations: 1: College of Physics and Electronic Engineering, Xuzhou Normal University, Xuzhou 221116, P.R. China; Anhui Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Hefei 230031, P.R. China. caitingdong@126.com 2: Physical Department, Binzhou University, Binzhou 256600, P.R. China 3: Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale 189A, Av. Maurice Schumann, 59140 Dunkerque, France 4: Basic Department of XuZhou Air Force College, Xuzhou 221005, P.R. China 5: Anhui Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Hefei 230031, P.R. China

Publication date: January 1, 2011

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