Devices that detect and respond to physical stimuli such as light, heat, motion, or pressure. They convert physical phenomena into electrical signals for measurement or control purposes.
From Latin 'sensus' meaning 'perception' or 'feeling', derived from 'sentire' meaning 'to feel or perceive'. The modern technological meaning developed in the mid-20th century as electronic detection devices became widespread.
The word 'sensor' beautifully bridges our biological and technological worlds - just as our eyes are light sensors and our skin contains pressure sensors, modern devices mimic these natural capabilities. Interestingly, many animals have sensors we lack entirely, like sharks detecting electrical fields or birds sensing magnetic fields for navigation.
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