How does surface finish affect accuracy?
All optical inspection machines capture light that reflects off the part. They measure the location of the part’s surface by processing this reflected light by whatever sensor is used. The amount of light reflected back depends on the part’s surface finish. There are four categories of surfaces that don’t reflect light well: shiny (light reflects away like a mirror, little reflects back to the sensor), black (the surface absorbs light and little reflects back), transparent (the surface transmits the light rather than reflects it) and oblique (most of the light reflects away, little gets back to the sensor).
