Eddy current proximity sensors can detect _______.

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. cotton
  2. metal
  3. wood
  4. ерохy

Answer (Detailed Solution Below)

Option 2 : metal
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Eddy current proximity sensors

F4 Vinanti Engineering 06.02.23 D12

  • Eddy current is a circular current that is induced by a conductor when it is kept in a changing magnetic field.
  • Eddy current sensors are used to detect the presence of non-magnetic conductive material such as metal.
  • Eddy current sensor operates based on the inductive eddy-current principle. 
  • When the sensing coil is supplied with an alternating current, it causes a magnetic field to form around the coil.
  • If an electrically conducting material is placed in this field, an eddy current field is induced according to Faraday’s induction law.
  • When the object moves, it causes a change in the impedance of the coil, which is proportional to the change in the distance between the sensor and the target.
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