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 pdf fileDisplacement and Speed Measurement
objectives: Name three methods of displacement measurement using passive electrical sensors; Sketch the construction and characteristics of LVDT; Explain the principles of operation of inductive and capacitive types of proximity sensors; Distinguish between variable distance and variable area type of capacitance displacement sensors; Sketch and explain the principle of operation of a optical type displacement sensor; Name two methods of noncontact type speed sensing and explain their principles of operation;

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 pdf filePositive Displacement Principle of Operation
These meters are of the rotary positive displacement type. The accurately-machined housing contains a rotor which revolves on ball bearings and carries evenlyspaced blades. As liquid fl ows through the meter, the rotor and blades (vanes) revolve about a fi xed cam causing the blades to move outward. The successive movement of the blades forms a measuring chamber of precise volume between two of the blades, the rotor, the housing, the bottom, and the top covers. A continuous series of these closed chambers is produced for each rotor revolution. Neither blades nor rotor contact the stationary walls of the measuring chamber.

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