CONTACTLESS DISPLACEMENT SENSOR USING MAGNETIC FORCE AND METHOD OF MEASURING DISPLACEMENT OF A BODY OF REVEOLTION

摘要

A contactless piezoelectric displacement sensor using magnetic force and a method of measuring displacement of a rotating body using the same are provided. The non-contact piezoelectric displacement sensor is arranged to be spaced apart from the rotating body in a direction perpendicular to the circumference of the rotating body, which is a bent magnetic body, and rotates according to a magnetic force that is inversely proportional to the distance to the rotating body that fluctuates while the rotating body is rotating. It includes a magnet that moves in the entire direction, an elastic element that restores the magnet in a direction opposite to the direction of the rotating body, and a piezoelectric element that is pressed by the magnet and converts mechanical stress due to the pressure into an electrical signal. It is a cylindrical rolling roll with a constant length in the direction, and the elastic element includes any one of a tension spring, a release spring, and a leaf spring, so that the degree of bending deformation, that is, displacement, of the rolling roll can be measured in a non-contact, that is, non-contact method. I can.