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.
We developed a fast infrared sensor to quantify the film thickness of industrially applied SiOx or AlOx plasma coatings on non-flat polymer substrates at production speed. Its underlying physical principle is comparable to infrared reflection absorption spectroscopy (IRRAS) at selected, fixed wavelengths. The coating materials can be measured via their specific phononic absorption bands in the infrared spectral range. In this paper, we demonstrate the functionality of our sensor on actual packaging materials to showcase its aptitude for industrial inline inspection. Furthermore, we discuss a possible extension of our sensor to enable spectroscopic measurements using a tunable Fabry-Pérot filter.
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