Skip to Content

Windscreen Fault Detection

Paul Stoddart
Collaborators: Pilkington Australia, Prof. Romesh Nagarajah, Dr Kynan Graves (Robotics and Non-contact Inspection Group, IRIS)

Optical techniques have been widely used for non-contact measurement of the 3-D shape of diffusely reflecting surfaces. However, there is no evidence for the successful implementation of a real-time shape measurement system for large specular surfaces, despite the many important industrial applications. Conventional stereo triangulation techniques are not applicable to specular surfaces, as a probe beam of known directionality will not in general be reflected into the aperture of either imaging device.

With support from an ARC Linkage grant and Pilkington Australia, this project aims to develop an optically-based technique to measure the relative shape of specular and transparent surfaces in real time in an industrial environment. Our approach is based on the use of reflected features to measure the deviation of a surface from an ideal or standard shape. The main outcome of the research will be a prototype on-line measurement system to control the quality of car windscreens.

The figure shows an analysis of deformations in a model windscreen.