A carbon dioxide sensor measures gaseous carbon dioxide levels by monitoring the amount of infrared (IR) radiation absorbed by carbon dioxide molecules. Measuring carbon dioxide is critical in monitoring many industrial processes and indoor air quality. Types of Carbon Dioxide Sensor. The following are two major types of carbon dioxide sensors: Nondispersive Infrared (NDIR) Carbon Dioxide Sensors. NDIR sensors are spectroscopic sensors that detect carbon dioxide in a gaseous environment by its characteristic absorption. It includes an infrared detector, an interference filter, a light tube and an infrared source. The gas is either pumped or diffused into the light tube, and the electronics measure the absorption of the wavelength of light.
Electronics is the science of controlling electrical energy electrically, in which the electrons have a fundamental role. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes, integrated circuits, associated passive electrical components, and interconnection technologies.
Electrical and electronics engineers design, develop, test and supervise the manufacture of electrical and electronic equipment such as: 1  Broadcast and communications systems.  Electric motors, machinery controls, and lighting and wiring in buildings, automobiles, aircraft, and radar and navigation systems.