A cylindrical mirror or lens is used to focus an input collimated beam of light onto a line on the surface to be inspected, where the line is substantially in the plane of incidence of the focused beam. An image of the beam is projected onto an array of charge-coupled devices parallel to the line for...http://www.google.com/patents/US7088443?utm_source=gb-gplus-sharePatent US7088443 - System for detecting anomalies and/or features of a surface
