Dr. Shaojie Chen
Dunlap Institute for Astronomy and Astrophysics
University of Toronto
Weslin Pullen
Hart Scientific Consulting International, LLC
Tucson, Arizona
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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