Sensor

Sensor is a specialized detecting device or measurement tool designed to recognize the presence and intensity of certain phenomena and to convert this sense knowledge into information.

Definition

According to Juran's Quality Handbook by Defeo (7th edition),

Sensor. A specialized detecting device or measurement tool designed to recognize the presence and intensity of certain phenomena and to convert this sense knowledge into information.

According to the CyBOK (version 1),

Sensor. A device that perceives certain characteristics of the real world and transfers them into a digital representation.