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A multiple-gas sensor based on absorption spectroscopy technique using a super luminescent diode source of 1.5 μm is proposed and realized for combustion applications. This technique allows CH4 and CO2 gas sensing in bio-gas plant to monitor the quality of the gas. In this study, a solid Fabry–Perot etalon with a free spectral range of 517 GHz is also used and the detection limit is improved, allowing...
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