Research on displacement measurement of disk vibration based on machine vision technique

Abstract

The paper proposes a new measurement of displacement based on machine vision technique. It ingeniously makes good use of principle of camera calibration and realizes non-contact measurement of disk vibration. There are mainly two parts during the whole process: first, the intrinsic parameters of the camera used are measured by means of highly precise calibration target, and then the extrinsic parameters of disk are obtained by camera. The displacement variation of the feature points on Z axis will be calculated by extrinsic parameters and the vibration displacement can be acquired by conversion of world coordinates with camera coordinates. Compared with previous methods, it can simultaneously obtain vibration displacement of many feature points on the disk, increase the efficiency and precision of measurement with simple and economic apparatus and wide range of application, thus a convenient, feasible and non-contact displacement measurement.