Nondispersive infrared sensor

A nondispersive infrared sensor (or NDIR sensor) is a simple spectroscopic sensor often used as a gas detector. It is non-dispersive in the sense that no dispersive element (e.g., a prism, or diffraction grating, as is often present in other spectrometers) is used to separate (like a monochromator) the broadband light into a narrow spectrum suitable for gas sensing.

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