A LVDT is used to measure displacement by assigning a specific signal value for any given position of the core. The primary core position determines how tightly its signal becomes when coupled with each of the secondary coils. The two secondary coils are series-opposed, resulting in the two signals on each secondary being 180 degrees out of phase. Therefore the phase of the output signal determines its direction, amplitude, and distance.
Displacement measurement using the LVDT as a displacement sensor is a comprehensive application area. By measuring the voltage amplitude and phase, operators can determine the extent of its core motion direction and displacement
The experimental setup with steel case and integrated power supply and Digital panel meter for measurement of voltage. The LVDT is mounted on a stand fitted with a micrometer for small mechanical movement. The displacement is measured in terms of voltage.
- The experimental setup helps to study : Linear displacement vs. Output voltage of LVDT.
The setup consists of the following specifications:
- Transducer : Linear Variable Differential Transformer ( LVDT ) fitted with stand.
- Excitation : Small mechanical movement of the LVDT Plunger by a micrometer.
- Electronic Block : Stable I.C. based oscillator with power amplifier.
- Phase sensitive detector.
- Differential Amplifier.
- Amplifier with adjustable gain.
- Output Indicator : Digital Voltmeter : 0 – 20 V, 3 ½ digit Digital Display.