An automatic measuring system of displacement and rotation angle of planar motion ring is designed. It can be used to measure the transverse and longitudinal displacement and rotation angle of the dynamic moving ring. Use optical triangulation method and visual detection method combined with signal fusion algorithm to achieve the purpose of high precision

dynamic displacement and rotation angle measurement. As the results of the experiment

the system can effectively solve the cross interference problem of horizontal displacement and rotation angle measurement of planar ring in two directions. At the same time

the precision of angle detection is 0. 05°and precision of displacement detection is 0. 1 mm.