Concentricity measurement method and measurement signal feedback device

The invention provides a concentricity measuring method and a measuring signal feedback device.The concentricity measuring method is applied to a split type centrifugal pump, the split type centrifugal pump comprises a first supporting ring and a second supporting ring, and a plurality of detection positions are arranged in the first supporting ring; the plurality of detection positions are uniformly distributed along the circumferential direction of the first support ring and are arranged close to the inner wall of the first support ring; the method comprises the following steps: setting out a plumb line at a detection position along a first direction; distance information between the plumb line and the inner wall of the first supporting ring is obtained; and distance information between the plumb line and the inner wall of the second supporting ring is obtained. The plurality of detection positions are uniformly arranged in the first supporting ring along the circumferential direction, and the plurality of