- Photoelectric Smoke Detector
A photoelectric smoke detector comprises an enclosure comprising the following components;
- a fine mesh shield to prevent the ingress of large particles and insects but still allows the ingress of smoke;
- a labyrinth vanes extending generally around the entire side wall of the smoke detection chamber to enable the ingress and egress of smoke particles;
- a light source for emitting light energy;
- a light receiver for providing an output signal at a signal magnitude proportional to the intensity of the light received;
- an electronic circuit that receives the output signal and transmits that signal to the fire detection control and indicating equipment ("FDCIE").
A photoelectric smoke detector operates on the principle that, under normal circumstances in clean air a light wave will travel in a linear direction (straight line) indefinitely. A photoelectric smoke detector leverages the concept that light can be scattered (reflected and refracted) when a light wave is contaminated by the airborne solids suspended in air (smoke).
In this scenario, the light source beam is scattered by the smoke within the chamber of the smoke detector where the light waves that are reflected and refracted are received by the light source receiver.