What is the working principle of Smoke alarm with 10Y sealed battery？

A smoke alarm with a 10-year sealed battery is a type of smoke detector that uses a long-lasting battery that is designed to last for 10 years without needing to be replaced. The working principle of a smoke alarm with a 10Y sealed battery is based on the detection of smoke particles in the air.

Inside the smoke alarm, there is a small chamber that contains a tiny amount of radioactive material. This material emits a constant stream of alpha particles, which are positively charged particles consisting of two protons and two neutrons.

In the absence of smoke, the alpha particles are attracted to the negative electrode in the chamber, and a small electric current flows through the chamber. However, when smoke particles enter the chamber, they interfere with the flow of the alpha particles, causing the electric current to drop.

This change in electric current is detected by a microchip inside the smoke alarm, which triggers the alarm to sound. The loud noise of the alarm is designed to alert people in the vicinity of the smoke alarm that there is a potential fire hazard.

The 10-year sealed battery in the smoke alarm is designed to provide power to the detector for its entire lifespan, without needing to be replaced or recharged. This makes the smoke alarm a low-maintenance device that can provide reliable fire protection for many years.