Darkfield Illumination

Darkfield illumination is a machine vision lighting technique that directs light at a very low angle relative to the inspection surface, causing only surface irregularities such as scratches, cracks, raised edges, and contamination particles to scatter light toward the camera. The result is a dark background with bright defect signatures, providing exceptional contrast for surface defect detection on materials that appear featureless under direct or diffuse lighting. Darkfield LED illuminators are essential for inspecting metallic parts, injection-moulded plastic components, pharmaceutical tablets, semiconductor wafers, and any surface where micro-defects must be reliably detected. RODER Vision darkfield illuminators include low-angle ring lights and bar lights, engineered for consistent grazing-incidence illumination geometry, high intensity output, and long operational life in industrial quality control environments.