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I detected her hesitance.

The police can detect people who drive dangerously by reading their number plates on surveillance cameras.

He detected some possible problems.

It's the first prison in the world to be using a drone-detecting fence.

to detect a problem with sth I could detect an undercurrent of resentment.

metal detector

Yesterday my smoke sensor detected a smoke.

The security system detected that a person broke into the house and the alarm went off.

The change was too small for him to detect.

The computer can detect 200 types of error.

The only metal that a metal detector can detect is the metal in another metal detector. That fact was instrumental in my parents' meeting.