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Mansoor Asif 

Lecturer

Electronics, Power and ControlGroup

Electrical Engineering Department

SEECS, NUST

Scool of Electrical Engineeringand Computer Science, NUST

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Displacement Sensors

Scool of Electrical Engineeringand Computer Science, NUST

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!#Displacement Sensors

• Measure te motion of a $od% $etweentwo points

• Principle – Con&ert applied force into displacement

• Most displacement transducer con&ertdisplacement into some electricalparameter

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!#Displacement Sensors

•  T%pes of displacement transducer

 – Potentiometer

 – L'DT – 'aria$le Capaciti&e Transducer

 – 'aria$le (nducti&e transducer

 – Strain Gauges

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"#Potentiometer

•  Te potentiometer initiall% )nown asreostat is simpl% a wire woundresistor

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Potentiometer

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Potentiometer

• Di*erent t%pes of potentiometer

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Potentiometer

• +esistance element wit a slidingcontact wic can $e mo&ed o&er telengt of te element

• Cange in resistance is con&erted tooutput &oltage proportional to tedisplacement of transducer