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FTIR Reflectance Spectroscopy as a Tool for Mapping the Surface Concentration of Coatings on Metal and Glass Surfaces

A reliable, convenient method for checking the presence, thickness, and uniformity of coatings on various surfaces, including metals and glass, is a long-standing concern in several industries. Performing the measurement non-destructively, and preferably without any surface contact, is also extremely important when coating integrity is a concern. We now report a new approach that uses an out-of-compartment grazing-angle FTIR method to enable non-contact mapping of the thickness and distribution of coatings such as lubricants across the surface of items such as hard disks. Other applications are also discussed.


1. Griffiths, P.R. and J. A. de Haseth, Fourier Transform Infrared Spectroscopy, Wiley-Interscience, 1986, chapter 5.III.

2. Melling, P.J., and P.H. Shelley “Spectroscopic accessory for examining films and coatings on solid surfaces,” US Patent 6310348, 2001. 

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