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28 May 2014 Optical design of a structured light phase shift system using no moving parts
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3D structured light systems based upon phase shifting analysis are well described in the literature. One of the challenges to obtaining high quality data is the noise often associated with the mechanism to shift the projected pattern accurately. The common methods of realizing a phase shift is to either mechanically move a grating pattern that is then projected to the part, or to move the pattern electronically in a programmable projector such as an LCD, LCOS or other projector. These projectors, often made for office use, are limited by the pixel resolution and the stability of the projectors. Mechanical shifts can be very precise, but require time and the maintenance of a mechanical movement. Other systems using projected interference patterns that use piezo shifters are faster and more reliable, but then can suffer from coherent speckle noise. This paper will discuss a unique optical design using a lens made telecentric in image space and an electro-optical image shifting approach that provides very fast image shifts in a very repeatable and controlled manner.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kevin G. Harding "Optical design of a structured light phase shift system using no moving parts", Proc. SPIE 9110, Dimensional Optical Metrology and Inspection for Practical Applications III, 91100T (28 May 2014);

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