Photoelectric smoke detectors detect smoke by using a light beam and a sensor. When smoke enters the detection chamber, it scatters light, causing some of it to hit the sensor and trigger the alarm.
Here’s a more detailed explanation put together for you by Anka Security:
1. Light Source:
Photoelectric smoke detectors contain a light source, usually an LED, which emits a beam of light.
2. Detection Chamber:
This beam is directed into the detection chamber, usually at an angle to the sensor.
3. Light Scattering:
When smoke particles enter the chamber, they scatter the light in all directions.
4. Sensor Detection:
The scattered light is then detected by a photocell or light sensor in the chamber.
5. Alarm Activation:
If the amount of scattered light reaching the sensor reaches a certain threshold, the detector’s alarm activates, alerting occupants of a potential fire.
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