An optical comparator, sometimes referred as profile projector is a inspection instrument that utilize traditional optics to magnify and project the image of inspected part onto a glass screen. The optical comparator cast a beam of high-intensity light on inspected part. Light travels through prism and projects the shadow of an object. The shadow is then compared with a chart showing tolerance levels for the part. Optical comparators are available in a wide variety of styles and configurations. Typical options are – projection screen sizes from 10″ to 80″, magnification range from 5x to 250x, horizontal or vertical light path, various stages, digital readouts and surface illumination systems.
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