A capacitive displacement sensor is a device that measures the distance between the sensor and an object by detecting changes in capacitance. It works by using an electric field created between two conductive plates. When an object approaches or moves away from the sensor, the capacitance changes, allowing the sensor to determine the displacement accurately. These sensors are commonly used in various applications, including industrial automation, robotics, and automotive systems. They are valued for their high precision, non-contact measurement capabilities, and ability to work in harsh environments, making them suitable for a wide range of engineering tasks.