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LVDT Transducers, also known as Linear Variable Differential Transformers, are used in the measurement of linear displacement. In this application field, the main purpose of an LVDT is to measure the displacement of the core relative to the secondary winding. It is usually used in manufacturing industries, hydraulic systems, aircraft and airplane industry, laboratory and research applications, and automotive engineering.

The working principle of an LVDT is based on the transformer principle. There is a ferrous core which is connected to the primary winding. This core is surrounded by two other windings, secondary and reference. The excitation signal is supplied to the primary winding, creating a magnetic field. The magnitude of this field depends on the position of the core. As the core moves, its distance relative to the two secondary windings changes, thus altering the magnitude of the magnetic field. The change in this field is then sensed by the secondary and reference windings, producing an AC voltage, which is proportional to the displacement of the core.

In a typical LVDT, the core is centered between the two secondary windings. When the core moves away from the center, the phase difference between the reference and secondary voltage increases. As the core is displaced further, the relationship between the two AC voltages is affected and the magnitude of the output signal increases. This output signal is then rectified, filtered and amplified to achieve the desired displacement value.

The resulting signal can be processed in a number of ways depending on the application. It can be digitized using an Analog to Digital Converter (ADC) or processed in the analog domain. It is also possible to use this signal to control a system, such as a servo motor. This is usually done by driving the signal through a control circuit to generate a digital output.

One of the main advantages of using LVDT Transducers is that they can be used for both low and high displacement applications, making them extremely versatile. Furthermore, they are rugged and robust, meaning that they can withstand large amounts of motion and vibration. Finally, they are accurate and reliable, with no hysteresis or non-linearity. This makes them ideal for applications where accurate readings are needed.

In conclusion, LVDT Transducers are an excellent choice for the measurement and control of linear displacement. The working principle is based on the transformer principle and involves the use of an AC voltage which is proportional to the displacement of the core. The resulting signal can be processed in a variety of ways depending on the application, making them highly versatile and accurate.

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