Patent 7570369 was granted and assigned to Volvo Aero on August, 2009 by the United States Patent and Trademark Office.
In a method for measuring the size or shape of an edge of a machined work piece or of a cutting edge of a tool, the surface of the edge is illuminated by diffused radiation from several positions in the vicinity to the edge by an illumination arrangement, and a picture of the edge is reproduced by recording reflected radiation from the illuminated edge by means of a picture reproduction unit.