Patent ID: 7187439
Filing Date: 2007-03-06
Classification: G01N

Abstract:
1. A method of optically inspecting an object for indicating the condition of the object, comprising the steps of: (a) alternately reflecting a first beam of radiation from one face of an area of the object to produce a short duration reflected beam and transmitting a second beam of radiation through the area of the object including the first face and a second face to provide a short duration transmitted beam; (b) respectively sensing the short duration reflected beam and the short duration transmitted beam and in response generating output signals reflecting a condition of the area of the object such that first output signals responsive to the short duration reflective beam are generated during the transmitting of the second beam and second output signals responsive to the short duration transmitted beam are generated during the reflecting of the first beam; periodically repeating steps (a) and (b) until a predefined portion of the object is radiated; and processing the output signals to provide an indication of the condition of the predefined portion of the object.