Roughness measurements with Digital Holographic Microscopy

Roughness measurements with Digital Holographic Microscopy

Surface roughness measurements are typically conducted by scanning a contact probe across the sample. However, when the features to be measured are less than half a micron, ambient vibrations can mask the signal and even contact with the subject surface could damage it. Digital Holographic Microscopy can capture the topography of the whole area of the surface under test in a few microseconds, from which roughness and waviness information can be obtained.