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MicroFinish Topographer: Surface Finish Metrology for Large and Small Optics (ABSTRACT)

ABSTRACT: Description of the MicroFinish Topographer (MFT) and why its unique mechanical design largely removes the need for vibration isolation. The paper also describes how the MFT is used for making surface roughness measurements on large and small optics as well as its usefulness for on-machine measurement due to its small size and light weight.
Tags Optical metrology, Surface finish, Surface Roughness, Surface Topography Measurement
Posted in Surface Roughness

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  • The PSM is an ideal tool for finding the center of curvature of a ball or the axis of a cylinder. The question is for how small a ball or cylinder can the PSM do this?

    The smallest article that was readily available was a piece of monofilament 8 pound test fishing line that was 290 μm in diameter. There was no problem finding the axis of the fishline, and separating the Cat’s eye reflection from the surface from the confocal reflection of the axis. The experiment was done with a 5x objective, and the result would have been even more definitive using a 10x objective.

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