STEMMER IMAGING

Standard coaxial illumination

Illumination for use on reflective surfaces.

This technique is used for illuminating reflective surfaces. A beam splitter or a semi-transparent mirror is used to divert the light from a light source that is fixed on the side (coaxial), so that it is projected almost parallel to the optical axes of the camera onto the object.

The technique of coaxial illumination is ideally suited to plain reflective, 'mirror-like' objects with no (or very little) profile or any surfaces which have diffuse backgrounds. Examples include PCB inspection, reflective labels, polished silicon wafers or print inspection.

More information:

• Advanced coaxial illumination
• Collimated coaxial illumination

 

A reflective object under a ring light showing a darker area in the centre

 

Same object using a coaxial light showing even 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

Learn more:

• Illumination
• Suitable illumination technologies and Important factors affecting lighting