Apparatus and method for inspecting an article

摘要

A method of determining the orientation of a grain structure of a turbine blade or vane using an optical technique, illuminates a surface with a beam from a light source and then manipulates the relative orientation of the surface, a light beam and detector to determine the relative orientation which provides the peak reflectance of the beam from the surface to the detector. Further surfaces of the component are similarly manipulated and illuminated and the orientation of the grain structure calculated from the determined relative peak reflectance orientations of the surface, first further surface and second further surface. Determination of the grain orientation allows the value of high angle boundaries to be determined. Also disclosed is apparatus suitable for performing the method.

主权项

1. A method of optically determining the orientation of a grain structure in a component, the method comprising;
presenting a surface of the component to a detector and illuminating the surface with a beam from a light source; manipulating the relative orientation of the surface, beam and a detector and determining the relative orientation which provides the peak reflectance of the beam from the surface to the detector; presenting a first further surface of the component to the detector and illuminating the first further surface with a beam from a light source; manipulating the relative orientation of the first further surface, beam and detector and determining the relative orientation which provides the peak reflectance of the beam from the surface to the detector; presenting a second further surface of the component to the detector and illuminating the second further surface with a beam from a light source; manipulating the relative orientation of the second further surface, beam and detector and determining the relative orientation which provides the peak reflectance of the beam from the surface to the detector; calculating the orientation of the grain structure from the determined relative peak reflectance orientations of the surface, first further surface and second further surface.