Advantages of LVDT displacer transducer


#1

The LVDT has distinct advantages over other devices used as a transducer for mechanical positions. Some of these advantages are :

  • Linearity of LVDT: Absolute linearity is defined as the largest deviation (or error) voltage of transducer output from the theoretical ideal, measured between zero and full-scale displacement and expressed as a percent of the full-scale output.

  • LVDT Sensitivity: In high-frequency excitation, the LVDT sensitivity is practically independent of changes in ambient temperature. Therefore, the sensitivity ratings are measured at a constant voltage, and are expressed as millivolts of output per volts of excitation per unit displacement (usually 0.01 mm) (mV / V / 0.01 mm).

  • In absence of any mechanical contact between the primary and secondary windings and the armature, there is no friction or hysteresis.

  • There is no mechanical wear and tear ensuring virtually infinite life.

  • Linear output assures accurate measurement with direct indicating instruments.

  • The resolution is very high, limited only by the indicating and control equipment.

  • The electrical output is completely isolated from the input, allowing addition or subtraction of signals without buffer amplifiers.

  • High-level output simplifies electronic circuitry.

  • Over-ranging does not cause any damage or permanent change in characteristics.

  • The LVDT is rugged and shock-resistant, and virtually maintenance-free.