Patent ID: 6930770
Filing Date: 2005-08-16
Classification: G01N

Abstract:
1. A method of optically inspecting an object for indicating the condition of the object, comprising the steps of: (a) reflecting a first beam of radiation from one face of an area of the object to produce a short duration reflected beam and simultaneously 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) 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; periodically repeating the step (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, wherein the first and second beams are characterized by different wavelengths.