Sensors and Transducers！

• A sensor is a device that responds to or detects a physical quantity
and transmits the resulting signal to a controller
• A transducer is a sensor that converts (transduces) one form of
energy to another form
• Basic types of sensors:
– Absolute: The output is always relative to a fixed reference, regardless
of the initial conditions
– Incremental: The output is a series of binary pulses
• Each pulse represents a change in the physical quantity by one resolution
unit of the sensor
• The pulses must be counted
– Analog: The output is continuous and proportional to the physical
quantity being measured,analog sensor,
– Digital: The output can only change by an incremental value given a
change in the measured physical quantity

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