Abstract
This paper describes a torque measurement method using integrated dot centroid tracking method which is a full-field measurement technique. Since torque makes torsional displacement of a shaft in three dimension, two dimensional displacement measurement cannot be directly applied. The measurement of torque requires a precise conversion from two dimensional displacement to three dimensional rotational displacement. The mapping, which represents relationship between two dimensional displacement and three dimensional torsional angle, is precisely calculated by high resolution computer graphics images. At first, the integrated dot centroid tracking method using the mapping is applied to static torsional measurement. After the experiment, the method is applied to dynamic torque measurement in a large milling machine. Those measurement results are compared with the result of a torque meter. The accuracy of static torque measurement is accepted. We evaluate measurement result and how to improve the accuracy of the measurement.
