Coaxial Lighting

Coaxial lighting is a machine vision illumination technique that directs light along the same optical axis as the camera, using a beamsplitter to eliminate specular reflections from flat, highly polished surfaces. This approach is essential for inspecting mirror-like materials such as metallic components, PCB traces, wafers, and optical glass where conventional ring lights or bar lights produce unacceptable glare. Coaxial lighting reveals surface features, engravings, scratches, and contrast variations that other techniques cannot detect on reflective substrates. RODER Vision coaxial illuminators are designed for integration with machine vision cameras and telecentric lens systems, ensuring uniform on-axis illumination across the full field of view. Applications include semiconductor wafer inspection, metal surface quality control, label verification on foil packaging, and precision dimensional measurement of reflective mechanical parts.