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Optical measuring techniques for micro structures are limited by the numerical aperture of the objective. Within
these limits different techniques can be used: white light interferometry uses an illumination source with short
coherence length to determine the absolute position of the surface while confocal profilometry uses the principle of
the defocus of light. As a relatively new technique, digital holography offers the simultaneous measurement of
intensity and phase of a wave to generate a 3D image with the acquisition of just one single image. We give some
application examples of these techniques to micro structures including deformation measurements.
Andreas Ettemeyer
"Optical 3D testing of micro structures", Proc. SPIE 7997, Fourth International Seminar on Modern Cutting and Measurement Engineering, 79971S (26 May 2011); https://doi.org/10.1117/12.891863
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Andreas Ettemeyer, "Optical 3D testing of micro structures," Proc. SPIE 7997, Fourth International Seminar on Modern Cutting and Measurement Engineering, 79971S (26 May 2011); https://doi.org/10.1117/12.891863