Capacitive displacement sensors are devices that measure the distance between the sensor and an object by detecting changes in capacitance. They consist of two conductive plates, with one plate typically fixed and the other movable. When the distance between these plates changes, the capacitance varies, allowing the sensor to determine the displacement accurately. These sensors are widely used in various applications, including industrial automation, robotics, and automotive engineering. They offer high precision and sensitivity, making them suitable for measuring small displacements in environments where contact-based sensors may not be effective.