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lec13 - Displacement Location or Position Sensors...

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2/18/11 1 ECE 117 Instrumentation Electronics Lecture 13. Position, Displacement, and Level Sensors Displacement, Location, or Position Sensors Potentiometric Capacitive Inductive Variable Reluctance Level Sensors Potentiometer Resistance linearly relates to wire length By making an object to control the length of wire, a displacement measurement can be made A stimulus is coupled to the pot wiper whose movement causes the resistance change Potentiometer Need to consider loading effect of interface circuit If there is an appreciable load, the linear relationship between wiper position and output voltage will not hold. Excitation voltage should also be kept constant (variations will cause measurement errors)
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2/18/11 2 Potentiometer Potentiometer types by construction Sliding potentiometers Rotary potentiometers (single and multi-turn) Potentiometers as Sensors Wind Vane Davis 7911 Potentiometers as Sensors Robot arm control http://www.youtube.com/watch?v=-XChu20hTxU
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2/18/11 3 Potentiometer Advantages Inexpensive Simple to use Relatively large displacements can be measured Disadvantages Noticeable mechanical load (friction) Need for a physical coupling with the object Low speed
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