Principle of displacement transducers
Displacement transducer work on the basis of mutual induction and displacement of non-electrical energy is converted into electrical energy. LVDT-linear variable differential transformer explained how the energy is converted in detailed way. It has many advantages like high output, low hysteresis, lower power consumption, cost effective, ruggedness, good linearity, infinite resolution, less friction and high sensitivity. High output helps in reduction of cost per unit which is a good sign. All these advantages help in much better performance of transducer than its competitive machines. Displacement transducer has some disadvantages to like it requires very high displacement for generating high voltage. It requires good amount of shielding as it is sensitive to magnetic field which inters increase the cost. In case of vibrations, these affect the functioning of transducer. It is highly affected by any kind of temperature changes. It has a very important application according to which it measures displacement ranging from fraction millimetre to centimetre. It also helps in measuring force, weight, pressure and many more components.
Displacement transducer consists of a cylinder form where it is covered by one primary winding in the centre and two secondary winding at sides. The turns in both secondary winding are the same but are opposite to each other. The net output voltages will be the difference in voltages between the two secondary coils.