Human vision is capable and flexible but can't make fast, precise and repetitive measurements. In these cases, a machine vision system is your best choice for precision measurements. Here we concentrate on how to use a machine vision system for precision optical gauging. One of the best methods for precision optical gauging is to light the part being measured from behind using collimated light (parallel light rays, like a searchlight). This casts a sharp shadow of the part into a telecentric lens (a lens that accepts only parallel light rays) and forms an image on a high resolution digital camera. Edge positions on the part are then measured to a fraction of a pixel using high-precision machine vision algorithms. We will examine how this works in a real-life situation, and then will further explore the elements of a machine vision system necessary for precision gauging.

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