The displacement sensor contains an adjustable potentiometer and a coaxial steel wire coil. As the wire stretches or contracts, the potentiometer's resistance changes accordingly. Its unique internal design ensures a good linear relationship between displacement and output voltage. The steel wire is made of 304 stainless steel and features a high-tension design, making it ideal for high-speed measurement applications such as knee displacement in automotive collision dummies, knee ligament stretching in pedestrian safety vehicles, and status monitoring of airborne equipment.