This segment of the edge of a 2 Euro coin includes an interesting star shape embedded in the edge of the coin. Try removing cylindrical form (Analysis Settings > Geometry/Form) and displaying the Wavelength Content graph to reveal the periodic pattern. Measured with a Zygo ZeGage Plus, 10x objective (desampled). Data source: Digital Metrology … Read more
The shiny side of aluminum foil. This side of the foil has long striations across the surface, whereas the dull side (also in the library) has a lot of fine, speckled detail. The difference all occurs in the very short wavelength domain, around 20 microns—removing a 4th order polynomial as the Reference Geometry reveals this … Read more
The dull side of aluminum foil. This side of the foil has a lot of fine, speckled detail, whereas the shiny side (also in the library) has many striations across the surface. The difference all occurs in the very short wavelength domain, around 20 microns—removing a 4th order polynomial as the Reference Geometry reveals this … Read more