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However, recent years has seen a few notable exceptions. The lighting and optics have long been widely recognized as an essential first step to a successful vision application. 3). Parts are not designed like optical elements, with well-defined optical characteristics. 3 An example of how a good optical system can produce a usable image (a) out of one that is not usable (b) to do a measurement. at best secondary. However, the optical performance of the part has a major impact on the ultimate performance of the machine vision system.

The view cannot be completely restricted with synchronized scanning if an array or a lateral effect photodiode is used. 9). In applications requiring only a profile measurement, these techniques offer good speed of measurement. If the full contour is of interest, then the line is scanned over the part, requiring a video frame of data for each profile line of interest. 8 A line of light-based sensor showing the surface profile. 9 One or more lines of light on a part provide cross sections of the shape.

Liu, and F. P. Chiang, Projection moire with moving gratings for automated 3-D topography, Appl. Opt. 22(6), 850 (1983). K. Harding and L. Bieman, Moire interferometry gives machine vision a third dimensional, Sensors October, 24 (1989). K. G. -G. G. Tang, Machine vision method for small feature measurements, Proceedings of SPIE, Two- and Three-Dimensional Vision Systems for Inspection, Control, and Metrology II, K. G. , Vol. 5606, pp. 153–160 (2004). 44. K. G. Harding and K. Goodson, Hybrid, high accuracy structured light profiler, SPIE Proc.

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Acoustical Measurements (rev.) by L. Beranek

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