Smoke detector
device · 1965 · Digital age
A sensor for smoke.
What it is made of
- Photodiode — has part. An optical scattering sensor.
Principles and materials it uses
- Radioactivity — uses. Ionization detectors use americium.
- Plastic — is made of. The case is plastic.
Where it is used
- Burglar alarm — is used in. A security system often includes smoke detectors too.
What it is a kind of
- Sensor — is a kind of. A sensor.