Fluorescence imaging is a powerful tool to detect the presence of processing agents, e.g., oils, lubricants, and organic coatings on metal surfaces. This imaging technique can be used in production, e.g. to determine the oil coverage on sheet metal to assure the best forming results or for inspecting the cleanliness of components before further processing like gluing, welding, coating, etc. The presented sensor is an evolution of the existing fluorescence laser scanner (F-Scanner) system1 and is optimized for measurement in motion. Adding this additional degree of freedom by mounting the scanner on a robot or gantry enables complete scans of large and complex shaped parts as well as selected areas that require special care, e.g., an increased level of cleanliness. The F-Scanner system has been improved in terms of footprint, weight, durability, and robustness. It can be operated with lightweight industrial robots and even cobots. In situations where ambient light makes fluorescence imaging challenging, a fast Fourier transform (FFT) based technique is used to ensure unperturbed measurements and high-contrast images. This work gives an overview of the advanced developments made and demonstrates the effect of FFT signal processing.
Many production and assembly processes in industry are subjected to particulate contamination, that could massively affect the product’s function. The detection of the particles could be a challenging task. Especially curved surfaces place high demands on the illumination system which can either be met with highly specialized setups or with a system with a high degree of flexibility. We present a cheap, fast and versatile detection system with the ability of bright and dark field illumination. Our setup offers fast and customized switching between different illumination channels adapted to the sample. The bright field illumination offers high sensitivity to scratches, whereas dark field illumination is more sensitive to particles. The system was tested on flat and curved surfaces. Since all components explicitly use standard computer interfaces, no additional hardware is needed to connect the system to a single-board computer or workstation.
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