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A photo interrupter is an opto-electronic sub-system composed of an optical emitter and a detector with amplifier, typically with only logic level electrical output. The emitter uses simple beam forming optics to project light onto the detector, both elements being mechanically positioned with a fixed gap between them. Transition edges can be used to trigger events, such as snapping a digital image with strobe illumination during high volume manufacturing to inspect aspects of production quality.

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