Carbon Dioxide Measurement Based on Multimode Diode Laser Correlation Spectroscopy Employing Wavelength Modulation Techniques |
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| Authors: | Guangzhen Gao Bo Hu |
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| Affiliation: | 1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology , Shanghai , P. R. China;2. Physical Science and Engineering Department , Binzhou University , Binzhou , P. R. China;3. Physical Science and Engineering Department , Binzhou University , Binzhou , P. R. China |
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| Abstract: | The use of a tunable multimode diode laser system based on correlation spectroscopy and wavelength modulation spectroscopy to measure the concentration of the carbon dioxide in ambient air through the 2 υ1 + 2υ2 + υ3 absorption lines around 1570 nm is reported. The carbon dioxide concentrations are derived from the relationship between the normalized second-harmonic signal peak heights of the measurement and reference signals. The validation of the system is conducted by a set of experiments with controlled carbon dioxide and nitrogen mixtures. The correlation and standard deviation between the measured and actual carbon dioxide concentrations are 0.9973 and 4.03%, respectively, over the tested range. A detection limit of 340 ppm m was achieved using 30 successive measurements during 30 min. All these results demonstrated potential utility of the system for carbon dioxide sensing. |
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| Keywords: | carbon dioxide concentration correlation spectroscopy measurement tunable multimode diode laser wavelength modulation spectroscopy |
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