Motion sensor
part · 1950 · Digital age
A passive infrared presence sensor.
Principles and materials it uses
- Infrared radiation — uses. Passive infrared.
- Plastic — is made of. The Fresnel lens is plastic.
Where it is used
- Burglar alarm — is part of. Motion sensors.
- Automatic door — is part of. A sensor.
What it is a kind of
- Sensor — is a kind of. A sensor.