Patent ID: 7312453
Filing Date: 2007-12-25
Classification: G01N

Abstract:
1. A non-destructive method for identifying an amount of corrosion product on a metallic substrate, the method comprising: transmitting an infrared beam onto a sample of the metallic substrate; collecting a reflected infrared beam reflected by the sample; non-destructively determining infrared absorbance (Ia) of the sample at three or more wavenumbers including a first wavenumber, a second wavenumber, and a third wavenumber, wherein the first wavenumber range is within a first band from 800 cm-1 to 1100 cm-1, and the second wavenumber range is within a second band from 1400 cm-1 to 1700 cm-1, and the third wavenumber range is within a third band from 3200 cm-1 to 3600 cm-1; correlating the infrared absorbance at the first wavenumber, at the second wavenumber, and at the third wavenumber to an amount of aluminum oxide corrosion on the sample; and displaying a map of the amount of corrosion on the sample.