What function does the light source serve in a refracted light scattering smoke detector?

In a refracted light scattering smoke detector, the light source plays a crucial role by scattering light onto the sensor. When smoke enters the detection chamber, its particles interact with the light emitted by the source. As these particles scatter the light in different directions, some of the scattered light reaches the sensor. This scattered light is then detected and analyzed by the detector's circuitry, triggering an alarm if it exceeds a predetermined threshold.

The primary function of the light source, therefore, is to create the necessary illumination that allows the smoke particles to disrupt the light path, which is essential for detecting the presence of smoke. This operation relies heavily on the principle of light scattering, making the light source integral to the functionality of the smoke detector.