STEMMER IMAGING

Collimated coaxial illumination

Collimated light source especially useful for detection of shallow flaws on on flat, reflective objects.

When rays of light in a beam are parallel, the light is collimated. Using light from a collimated light source is especially useful for detecting shallow flaws and dents on flat, reflective objects.

The drawing shows the light from a point light source passing through a lens that creates a parallel light beam. Wherever the surface is perfectly flat, the light is reflected back through the lens, These areas appear bright in the image.

See also:

• Standard coaxial illumination
• Advanced coaxial illumination

Any surface features such as sepressions or bumps reflect the light out of the field of view of the lens, and appear as dark areas on the image. The example with the dented coin cell shows this effect clearly.

 

A battery with shallow dents under standard coaxial illumination

 

The same battery as imaged under collimated illumination

This short tutorial gives you insights into methods of illumination for machine vision in order to improve your inspection results. If you want to learn more about illumination, visit one of our on-site illumination trainings.

• All training events

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Learn more:

• Illumination
• Suitable illumination technologies and Important factors affecting lighting