I wonder how the mirrors are cleaned or kept clean. Maybe that isn’t an issue when detecting concentrations that would take a mile of light to measure, and existing NDIR detectors are sufficient for things like detecting different gasses in pollution.
It would be nice if there were general purpose gas measurement sensors that could identify more gasses rather than being specialized to a specific gas. Could this be done by replacing the circuitry of a typical evaluation board with an interface to something like an NVidia Jetson Orin Nano?