A linear variable differential transformer (LVDT) is an electromechanical device used to measure linear displacement. It consists of a primary coil and two secondary coils arranged symmetrically around a movable ferromagnetic core. When an alternating current flows through the primary coil, it induces a voltage in the secondary coils, which varies based on the core's position. LVDTs are widely used in various applications, including aerospace, automotive testing, and industrial automation, due to their high accuracy and reliability. They can measure displacements in the range of millimeters to several meters, making them suitable for both small and large-scale measurements.