Patent ID: 7119336

Claim:
A non-destructive method of measuring a non-scattering coating on a metallic substrate, the method comprising: non-destructively determining at a first wavelength in a first range from around 7 μm to around 8 μm a first total amount of infrared energy reflected from a coated metallic substrate including aluminum with a scattering surface that is coated with a non-scattering coating of phosphoric acid anodize; non-destructively determining at a second wavelength in a second range from around 10.5 μm to around 12 μm a second total amount of infrared energy reflected from the coated metallic substrate; determining a difference between the first and second total amounts of infrared energy; and determining that at least a predetermined amount of the coating is coated on the coated metallic substrate when the difference between the first and second total amounts of infrared energy is at least a predetermined difference.