3-D low-coherence imaging for multiple-layer industrial surface analysis

Summary form only given. In conclusion, this system may provide useful information about reflecting interface layers inside transparent objects, at micron scale over a virtually unlimited range. In spite of the 8-bit intensity resolution and 56-dB dynamic range of the CCD camera, which theoretically limit the number of detectable air-glass interfaces to about 80, good images have been obtained in both cases. This method could be especially beneficial for applications where the object features are difficult to access by direct physical measurement such as in assessing the surface roughness of a paint layer under a clear lacquer coating.