Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from...http://www.google.de/patents/US6249340?utm_source=gb-gplus-sharePatent US6249340 - Apparatus and method for measuring optical characteristics of an object
