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An illuminated circular aperture is projected onto a
diffuse surface, yielding a bright light spot. The light
spot is in turn imaged onto a plane containing a siiall
photo detector.
Andrianto Handojo
"Simple method for measuring surface profile and vibration", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.34932
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Andrianto Handojo, "Simple method for measuring surface profile and vibration," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.34932