Procedure for Analyzing Geometrical Characteristics of an EDM Calibration Bench

摘要

One of the methods to determine the accuracy of an EDM total station is by a calibration procedure on a measuring bench, with a laser interferometer to monitor the real distance. For this specific calibration method an alignment of the prism and a solid knowledge of the construction of the bench is indispensable. Aberrations of the bench in lateral or vertical way, or rotations of the carrier may cause instabilities in receiving the reflected laser beam of the interferometer. This paper describes a measuring and correction procedure, by using a Trimble S6 robotic total station, combined with an LSP-30 laser interferometer on an EDM measuring bench. The study highlights that the lateral and vertical errors on the distance, as well as the rotation movements of the carrier, can be corrected rather accurately. However, the error on the horizontal distance, which increases in relation to the distance, could not completely be removed from the dataset. Additional research is required to solve this issue.