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Displacement 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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5
timesPositive 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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