Sensor: meaning, definitions and examples

This term is often used in technology and engineering to refer to devices that detect changes in the environment, such as temperature, light, or motion.

• The smartphone has a light sensor to adjust the screen brightness.
• Security systems use motion sensors to detect intruders.

Used for devices that specifically discover or identify the presence of something, often used in safety and security contexts.

• The smoke detector went off when the toast burned.
• A metal detector is used at airports to find prohibited items.

This term usually relates to devices or instruments used for detailed or precise exploration and measurement, commonly found in scientific and medical fields.

• A medical probe is used during surgeries to examine tissues.
• Space probes are sent to other planets to collect data.

This word is general and refers to something that shows or points out the state or level of something, often used in dashboards, control panels, and signs.

• The fuel indicator shows how much gas is left in the tank.
• Economic indicators suggest that the economy is improving.

A device or instrument designed to detect conditions or changes in the environment.

• The motion sensor activated the alarm.
• The sensor measured the temperature accurately.

To become aware or conscious of something through the senses, particularly sight or mind.

• She perceived a change in his mood.
• He perceived a faint smell of smoke.

To discover or identify the presence or existence of something, often using specialized equipment or methods.

• Scientists detected a new virus.
• The radar can detect incoming planes.

To carefully watch or monitor something, often for a period of time, to gather information.

• The astronomer observed the stars.
• He observed the behavior of the animals in their natural habitat.