Simultaneous measurement of CO and CO2 at elevated temperatures by diode laser wavelength modulated spectroscopy |
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| Authors: | Tingdong Cai Guishi Wang Weijun Zhang Xiaoming Gao |
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| Affiliation: | 1. Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Hefei 230031, PR China;2. College of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, PR China |
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| Abstract: | One single semiconductor distributed-feedback (DFB) laser is used to demonstrate the possibility of simultaneous measurements of CO and CO2 at elevated temperatures. Wavelength modulation spectroscopy with second-harmonic detection is used to improve the detection sensitivity and accuracy. The concentrations of CO and CO2 are determined from the WMS-1-normalized absorption-based WMS-2f signal peak heights of a proper line pair of CO and CO2 near 6357.814 cm−1 and 6357.312 cm−1, which are selected using some line-selection criterions for the target temperature range of 300–1000 K. The CO and CO2 concentrations measurements are within 2.86% and 2.69% of the expected values over the tested temperature range 300–1000 K. The minimum detectable concentrations of CO and CO2 at 1000 K are 250 ppm m and 280 ppm m respectively. |
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| Keywords: | Tunable diode laser spectroscopy Measurement CO2 and CO Concentration |
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