Measuring the radius of curvature of a spherical surface
This month's PSM application describes measuring the radius of curvature of a spherical surface.
Starting in 2020, we'll be featuring an application of the Point Source Microscope (PSM) every month.
This month's PSM application describes measuring the radius of curvature of a spherical surface.
A Point Source Microscope (PSM) was mounted on a motorized vertical stage above a 25 mm diameter, 200 mm efl lens sitting above a plane mirror. A square black paper mask with an 8 mm diameter hole was placed over the lens as shown in the figure below to give an f/25 aperture.
Customers purchasing a PSM often ask me if we offer mounting hardware for the PSM like x-y-z stages.
Can the PSM find best focus of an f/25 optical system to less than ± 10 μm?
A combination of the Auto Gain function of the Point Source Microscope (PSM) and the use of an Axicon grating make centering of severely misaligned lenses easy.
Recently a customer was using the Point Source Microscope (PSM) to align a slow, singlet objective lens and find its focus.
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.
清 原 耕 輔 Kosuke Kiyohara
清原光学 営業部 Kiyohara Optics / Sales
+81-3-5918-8501
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Kiyohara Optics Inc.
3-28-10 Funado Itabashi-Ku Tokyo, Japan 174-0041
Armstrong Optical
+44(0) 1604 654220
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Mersenne Optical Consulting
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