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31 December 2019 Non-dispersive infrared methane sensor with semi-elliptical gas cell
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Here we present a non-dispersive infrared (NDIR) methane sensor with semi-elliptical gas cell for monitoring the lower explosion limit (LEL) of methane (5%VOL in China). The special design of gas cell is used to reduce optical loss. And the novel NDIR scheme with narrowband mid-infrared light emitting diode (mid-IR LED) efficiently can solve the problem of humidity and background gas interference in theory and practice. This can be attributed to that the combination of narrowband LED and broadband photodiode (PD) was chosen. And insensitivity to humidity has been validated by experiments. Temperature dependency has been improved by temperature compensation. This scheme is not only used to detect the methane concentration, but also to detect other gas such as carbon dioxide contents in the air if the LED is changed.
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Yuehan Li, Shengbo Qi, and Zengliang Bi "Non-dispersive infrared methane sensor with semi-elliptical gas cell", Proc. SPIE 11384, Eleventh International Conference on Signal Processing Systems, 113841B (31 December 2019);

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