electric eye
/ɪˈlɛktrɪk aɪ/
NOUN
1. A device that detects light
An electronic sensor that responds to changes in light intensity and converts them into electrical signals, often to control or activate equipment automatically.
1.1. Photoelectric sensing
A light-sensitive device that detects the presence, absence, or intensity of light and converts the detected change into an electrical signal.
Synonyms
- photoelectric cell
- photocell
- photoelectric sensor
- light sensor
- optical sensor
Examples
- The electric eye detects changes in light intensity and activates the alarm.
- A photoelectric cell functions as an electric eye in the automatic lighting system.
Related Words
- photodetector
- photodiode
- phototransistor
- light beam
- light intensity
- electrical signal
1.2. Automatic object or movement detection
A sensor that detects an approaching person or object by monitoring an interrupted or reflected beam of light, allowing connected equipment to operate automatically.
Synonyms
- photoelectric sensor
- optical detector
- light-beam sensor
- photocell
Examples
- The automatic door uses an electric eye to detect approaching visitors.
- The electric eye stops the machine when an object interrupts its light beam.
- An electric eye prevents the garage door from closing when something blocks its sensor.
Related Words
- motion detector
- proximity sensor
- infrared sensor
- automatic door
- safety beam
- obstacle detection
1.3. Electronic security detection
A light-sensitive detection device used in security systems to identify movement, detect interruptions in a monitored beam, or trigger an alarm when an object crosses a protected area.
Synonyms
- photoelectric detector
- optical security sensor
- light-beam detector
Examples
- The security system uses an electric eye to detect movement across the entrance.
- An electric eye triggers the alarm when someone interrupts the invisible beam.
Related Words
- alarm
- security system
- intrusion detection
- surveillance
- sensor trigger
- perimeter protection