Lec13 - Displacement Location or Position Sensors Potentiometric Capacitive Inductive Variable Reluctance Level Sensors ECE 117 Instrumentation

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
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 Friction and excitation voltage cause heating of the
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/22/2012 for the course ECON 1 taught by Professor Tuki during the Spring '12 term at CSU Pueblo.

Page1 / 9

Lec13 - Displacement Location or Position Sensors Potentiometric Capacitive Inductive Variable Reluctance Level Sensors ECE 117 Instrumentation

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online