Definition
A device or circuit that senses the presence of a specific physical condition, signal, or substance and produces a usable output indicating that it has been found. In aviation electronics, a detector commonly refers to a circuit that extracts the information signal (such as audio or data) from a modulated radio carrier wave.
Plain English
Something that notices when a particular thing is present and signals that it has been found. In radios, it is the part that pulls the useful signal out of the incoming radio wave so you can hear or use it.
Context Anchor
Seen in aircraft system descriptions such as fire detectors, carbon monoxide detectors, chip detectors, and radio receiver circuits.
Derivation
From the Latin detegere, meaning 'to uncover' or 'to expose.' A detector uncovers something that is otherwise hidden — a signal buried in a carrier wave, smoke in a cargo bay, or ice forming on a probe.
Why Pilots Care
Prompt warning of fire, engine wear, or icing lets the pilot act before the condition becomes an emergency.
Intuition Check
Do not think of a detector as only a handheld tool. In aviation, a detector can be a built-in aircraft sensor or an electronic circuit inside a system.
Example Sentence 1
The smoke detector in the aft cargo compartment triggered a warning light on the overhead panel.
Example Sentence 2
Before engine start the crew tested the fire detector loops to confirm they would sense an overheat condition.