An LVDT is used for measuring _________.

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. frequency
  2. speed
  3. temperature
  4. displacement

Answer (Detailed Solution Below)

Option 4 : displacement
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Linear Variable Differential Transformer (LVDT)

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  • These devices are used to measure displacement.
  • It is the most widely used inductive transducer that converts linear motion into an electrical signal.
  • The LVDT is placed inside a stainless steel housing because it will provide electrostatic and electromagnetic shielding.
  • LVDTs operate on the principle of a transformer.
  • The transformer consists of a primary winding and two secondary windings wound on a cylindrical former.
  • Both the secondary windings have an equal number of turns, and we place them on either side of the primary winding.
  • The primary winding is connected to an AC source which produces a flux in the air gap and voltages are induced in secondary windings.
  • A movable soft iron core is placed inside the former and the displacement to be measured is connected to the iron core.
  • Both the secondary windings are connected in such a way that resulted in output is the difference between the voltages of the two windings.
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