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Non-Dispersive Infrared Sensors (NDIR)

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Fig.: Mid-infrared absorption spectra of some industrially-useful gases, data from HITRAN. Source: Daniel Popa and Florin Udrea: “Towards Integrated Mid-Infrared Gas Sensors”. Sensors 2019, 19(9), 2076; https://doi.org/10.3390/s19092076

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Sources:

https://en.wikipedia.org/wiki/Nondispersive_infrared_sensor