Gas sensing spans various technologies. These include electrochemical, PID, and MOS sensors which each offer distinct advantages in terms of sensitivity, range, and application. Infrared (IR) sensors, for example, excel at detecting gases with specific absorption bands (i.e., CO2). Yet they often lead to greater system complexity. Conventional IR sensors use a prism or diffraction grating to break broadband infrared light into its constituent wavelengths—and these added optical elements generally increase the sensor’s size and cost.

Non-dispersive infrared (NDIR) gas sensors are the preferred solution for cost-effective, highly selective gas sensing. They use an optical filter instead of a dispersive element to process infrared radiation, allowing for greater compactness of design without compromising the integrity of the detector output.

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