Statistical analysis of the angle of linear polarization for the winding angle measurement in carbon fibre components

In this work, the problem of determining the winding angle in a cylindrical carbon fiber piece, obtained through a filament winding process, is investigated. A polarization camera is used for the measurement, and the winding angle is determined by statistically analyzing the angle of linear polarization in each pixel of the region under study. The main influence parameters are considered, like non-planarity and superficial state of the piece, with the aim of reducing the measurement uncertainty. For this purpose, two different types of data processing approaches are tested and compared.