An improved method for measuring the shape of a workpiece, and an associated device. The invention has three aspects. The first aspect of the invention is a triangulation device that creates an annular image whose diameter is a linear function of the distance from the device to the workpiece. According...http://www.google.fr/patents/US5978089?utm_source=gb-gplus-shareBrevet US5978089 - Non-contact method for measuring the shape of an object
Non-contact method for measuring the shape of an object
