A displacement measuring system is a device that measures the movement of an object in a straight line. It is typically used in industrial automation and robotics for precision positioning and motion control. It usually consists of a sensor, a processor, and an output device. The sensor detects the movement of the object, the processor processes the data, and the output device provides the result. The device is used to accurately measure linear distances with high precision, so that the object can be moved precisely and accurately.