How smoke detectors work

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Recently when I was cooking in my home, some of the food spilled over from the vessel and came in contact with the heating element giving rise to a dense smoke with the smell of burnt food like charcoal! Then the alarms inside our house went off! After a while,the smoke left the building through the windows and the alarms became quiet again.

I was curious to understand how these alarms worked. A quick google search led me to two different types of alarms – ionization vs. photoelectric.

There is a very nice infographic about these two types of alarms – Ionization and Photoelectric



A nice video of how it works:


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