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Under Construction.
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====== Non-Dispersive Infrared Sensors (NDIR) ======

[{{https://upload.wikimedia.org/wikipedia/commons/thumb/3/34/Mid-infrared_absorption_spectra_of_Gases.png/800px-Mid-infrared_absorption_spectra_of_Gases.png|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}}]

CC BY 4.0
===== Sources: =====

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