Abstract
This paper presents a new laser interferometric distance measuring method which can be applied to parallel mechanisms. This method has a strong merit that the gap of joint and the error by bending deformation in the value of measured length are includes in measuring value, so that the influence of these error can not be appear in the system evaluation and the calculation the coordinates. The key of this method is that the mirror of interferometer is sphere and a lens is located in front of sphere by the distance of the focus. The experimental result of the travel within 100mm is describes and compared with linear scale.
