Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured....http://www.google.es/patents/US6118521?utm_source=gb-gplus-sharePatente US6118521 - Apparatus and method for measuring optical characteristics of an object
Apparatus and method for measuring optical characteristics of an object
