https://homeimprovementmagazine.org/smoke-detectors-how-do-they-work/

The most well-known sorts of smoke detectors that are used in homes are photoelectric detectors. Its chamber contains a beam of laser light. The beam ceases to work when there is smoke within the chamber. The alarm will be activated whenever smoke comes into the chamber. They’re useful for preventative fire systems because they are able to detect slow burning and simmering flames. The ionization detection detector, which is the most popular fire detector can also be found. Two plates in the chamber are electrically stimulated to generate continuous flow of ions through the chambers. One of the plates is opened so that smoke could enter. Also known as a reference chamber. Smoke cannot enter it. The alarm sounds if the ion flow in the open chamber is different from that found in that chamber. Smoke is able to enter the chamber, disrupting the flow of ions which triggers the alarm. They’re the best at detecting burning fires that are fast, however they are also triggered through cooking, dust or other means. There are also dual sensor smoke detectors which incorporate Ionization sensing and photoelectric techniques.
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