Patent ID: 9383310
Filing Date: 2016-07-05
CPC Classification: G01N

Claim Text:
1. A method of determining the value of a boundary between a primary grain and a secondary grain in a component, the method comprising the steps of: identifying a boundary between a primary grain and a secondary grain which are presented on a surface of the component; illuminating the primary grain with a beam from a light source and manipulating the relative orientation of the surface, beam and a detector detecting the light reflected from the surface and determining a first relative orientation which provides the peak reflectance of the beam to the detector; illuminating the secondary grain with a beam from a light source and manipulating the relative orientation of the surface, beam and the detector detecting the light reflected from the surface and determining a second relative orientation which provides the peak reflectance of the beam to the detector; wherein the difference between the first and second relative orientations gives a value that indicates the magnitude of the angle boundary.