Discussion
One of the following transducers is very popular for measurement of rotational displacements :
Answer: A
The transducer popular for rotational displacement is the shaft encoder.
A shaft encoder, optical or magnetic, is mounted on a rotating shaft and gives digital pulses or a digital code as it turns. Incremental encoders count pulses to measure angle and speed; absolute encoders give a unique code for each angular position. They are widely used in motors, robots and CNC machines.
An LVDT (linear variable differential transformer) measures linear displacement; its rotary counterpart is the RVDT. Strain gauges measure strain, and differential capacitors are used mainly for small linear displacements. None of these is the standard choice for rotation.
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