Beam Detectors Working Principle: A Beam Detector has two main parts. 1. Source like IR LED, LASER, or any type. 2. Detector like Photodiode etc. An optical beam smoke detector is a device that uses a projected beam of light to detect smoke across large areas, typically as an indicator of fire.
Principle Of Ionization Type Smoke Detector. The principle of ionization type smoke detectors is as shown above. Alpha radiation from the Americium-241 foil increases the ability of air to conduct electricity and thus ionizes the air through Chamber A and B allowing an electrical current flow.
How Optical Smoke Alarms Work. An optical smoke alarm (also called photo-electric smoke alarm) works using the light scatter principle. The alarm contains a pulsed Infra red LED which pulses a beam of light into the sensor chamber every 10 seconds to check for smoke particles.