Metal foils are widely utilized in various industries, including battery electrode materials, medicine packaging, and electronic components. However, the production of these foils often results in the formation of 3D defects, which can lead to foil punctures and compromise the functionality of the final product. Existing inspection systems are limited to 2D inspections and cannot meet the requirements of dynamic specular surface 3D inspection on production lines. This project aims to develop a cutting-edge dynamic specular surface 3D sensing technology with high resolution and a large field of view (FOV). The proposed technology involves the development of a novel pattern generator that generates and projects multi-frequency line patterns synchronously onto the moving surface being inspected. Simultaneously, a coaxial telecentric line scanning system captures the reflected line patterns. To retrieve accurate surface topology in real-time, a specialized spatial phase retrieval algorithm is applied to the captured line patterns, which are then fused together to generate multi-frequency phase maps. By overcoming the limitations of traditional methods, our proposed technology fulfills the demands of dynamic 3D inspection for various specular surfaces on production lines. This advancement will significantly reduce the false detection rate and associated production costs, ensuring higher product quality and efficiency.
