Transducers
Terminology
Transducer types
Positional Sensors: potentiometer
Positional Sensors: LVDT
Positional Sensors: Inductive Proximity Switch
Positional Sensors: Rotary Encoders
Temperature Sensors
Thermocouples
Light sensors: photoconductive cells
Light level sensitive switch
Photojunction devices
Photovoltaic Solar Cells
Photomultiplier tubes (PMT)
Motion sensors/transducers
Sound transducers
Piezo transducers
Summary

Positional Sensors: Inductive Proximity Switch
Detects the presence of metallic objects (non-contact) via changing inductance
Sensor has 4 main parts: field producing Oscillator via a Coil; Detection Circuit which detects change in the field; and Output Circuit generating a signal (NO or NC)