1. National standard GB7665-87 definition of sensor: The sensor is a detection device that can feel the measured information, usually consisting of sensitive elements and switching elements.
2. The sensor consists of four parts: sensitive components, conversion components, conversion circuit and auxiliary power.
Sensor output signal division
Non electric quantity
With contact type(eg: contact switch)
NO contact type (eg photoelectricty switch)
Resistive type (eg: potentiometer)
Voltage/electric current (eg: CDS battery )
Inductors/capacitor(eg: variable capacitor)
Count type (eg: counter)
Code type(eg: tape)
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