× Home Basic Electrical Circuit Theories Electrical Laws Materials Batteries Illumination Generation Transmission Distribution Switchgear Protection Measurement Control System Utilities Safety Transformer Motor Generator Electrical Drives Electronics Devices Power Electronics Digital Electronics MCQ Videos Forum

Linear Variable Differential Transformer LVDT

Definition of LVDT

The term LVDT stands for the Linear Variable Differential Transformer. It is the most widely used inductive transducer that coverts the linear motion into the electrical signal.Linear Variable Differential Transformer LVDT The output across secondary of this transformer is the differential thus it is called so. It is very accurate inductive transducer as compared to other inductive transducers. linear variable differential transformer

Construction of LVDT

Main Features of Construction

Principle of Operation and Working

As the primary is connected to an AC source so alternating current and voltages are produced in the secondary of the LVDT. The output in secondary S1 is e1 and in the secondary S2 is e2. So the differential output is, This equation explains the principle of Operation of LVDT. linear variable differential transformer Now three cases arise according to the locations of core which explains the working of LVDT are discussed below as, Output VS Core Displacement A linear curve shows that output voltage varies linearly with displacement of core. output versus core displacement Some important points about magnitude and sign of voltage induced in LVDT

Advantages of LVDT

Disadvantages of LVDT

It is concluded that they are advantageous as compared than any other inductive transducer.

Applications of LVDT

  1. We use LVDT in the applications where displacements to be measured are ranging from a fraction of mm to few cms. The LVDT acting as a primary transducer converts the displacement to electrical signal directly.
  2. The LVDT can also act as a secondary transducer. E.g. the Bourbon tube which acts as a primary transducer and it converts pressure into linear displacement and then LVDT coverts this displacement into an electrical signal which after calibration gives the readings of the pressure of fluid.



Comments

Related Articles Measuring InstrumentsTransducerErrors in MeasurementPMMC InstrumentCharacteristics of SensorsMoving Iron InstrumentElectrostatic InstrumentsResistance Temperature DetectorEnergy MeterRectifier Type InstrumentThermistor ThermometerThermocouple Type InstrumentsThermistorMeasurement of Three Phase PowerThermocouple Temperature MeasurementTemperature TransducersMeggerRadiation PyrometerOptical PyrometerPiezoelectric TransducerStrain GaugePower Factor MeterInductive TransducersPhase Sequence IndicatorLVDTOscillator TransducerPI TestVoltage SensorTan Delta TestMeasurement of Electrical EnergyEnergy Meter TestingMonostable MultivibratorBistable MultivibratorAstable MultivibratorMore Related Articles MetersDigital MetersPotentiometerBridgeOscillatorCROInstrumentNew Articles Natural Gas Power GeneratorsHow to Choose the Best Theater Lighting Equipment?How to Make an Electric Water Pump?Voltage RegulatorsTuned Collector Oscillator Articles Categories MCQ Contact Us Basic Electrical Circuit Theories Electrical Laws Materials Batteries Illumination Generation Transmission Distribution Switchgear Protection Measurement Control System Utilities Safety Transformer Motor Generator Electrical Drives Electronics Devices Power Electronics Digital Electronics Videos