Position Transducer - Displacement Measurement

How Position Transducers Work

Position transducers convert mechanical motion into an electrical signal that may be metered, recorded, or transmitted. Position transducers consist of a stainless steel extension cable wound on a threaded drum that is coupled to a precision rotary sensor such as an incremental encoder, absolute encoder, hybrid or conductive plastic rotary potentiometer, RVDT, synchro, or resolver.
position transducer

Operationally, the position transducer is mounted in a fixed position and the extension cable is attached to a moving object. The axes of linear movement for the extension cable and moving object are aligned with each other. As movement occurs, the cable extracts and retracts. An internal spring maintains tension on the cable. The threaded drum rotates a precision rotary sensor that produces an electrical output proportional to the cable travel. The output is measured to reflect the position, direction, or rate of motion of the moving object.

How Position Transducers Are Used in Industry and Science

Position transducers are used in a broad range of position, displacement, and velocity measurement applications to:
Measure distance traveled 
Continually sense location or relative position 
Indicate levels 
Act as limit sensors 
Control actuators through position sensing 
Act as signal generators for recording position versus time, cycle rate, or magnitude of random/cycle events 
Monitor relative motion 
Indicate events 
A Few of the Industries Using Position Transducers
Aircraft/Aerospace 
Robotics 
Automotive/Transportation/Racing 
Space Research 
HVAC 
Test and Measurement 
Entertainment 
Maritime/Naval 
Hydraulics and Pneumatics 
Laboratories 
Industrial Automation 
Motion Control 
Water Service and Treatment 
Medical 
Oil and Gas 
Railroad/Trucking 

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