Smoke Detectors

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A smoke detector have two basic parts. It is compose of a sensor and a bell. Currently, There are two kinds or types of detectors; these are the “Photoelectric” detector and the “Ionization” detector.

In the Photoelectric detector, the bell is triggered when the smoke blocks the light beam inside.

At 90 degree angles the light source and the sensor are positioned to one another. When the smoke enters inside the detector, the smoke scatters the light, making some amount of the light to hit the sensor and triggers the bell.

In the ionization detector, the bell is triggered when the smoke enters the chamber and disrupts the electric current. The drop-in current then makes the bell ring.

Ionization Smoke Detector


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Image via Wikipedia

The chamber of the ionization detector is compose of two plates with charge and with Americium 241.

Americium 241 is a  kind radioactive source of ionizing radiation. The oxygen atoms and the nitrogen atoms will be ionize by the particles from the Americium 241.

As it ionize, the electrons will be knock off resulting of having free electron and an atom with lacking of an electron.

The plate with a positive charge will going to attract the free electrons, and the plate with a negative charge will going to attract the positive atom.

This activity will then cause a small amount of electrical current.

As the smoke enters, it will interfere with this electrical current, the smoke particles will attached the ions and neutralize them, then the drop-in current triggers the bell.


Image via Wikipedia


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