Beam Detectors For the purpose of detecting motion, infrared sensors use infrared wavelengths. Although there are many uses for IR sensors, they are most frequently utilised in security systems installed in homes and businesses. Active infrared (AIR) sensors and Passive infrared (PIR) sensors, often known as infrared detectors, are the two types of infrared sensors. Our comprehensive reference to AIR sensors is solely for infrared beam sensors, also known as photobeam sensors, which use Active Infrared (AIR) to detect motion. Active infrared (AIR) sensors are the kind of sensors that use a transmitter to send out infrared radiation that are then picked up by a receiver. Any change in the waves' path shows the presence of an object. Working of Beam Detectors : The transmitter emits an infrared beam that travels in a straight line thanks to an infrared LED inside of it. The IR waves travel in a straight line from the transmitter to the IR receiver, which is located directly across ...