Microplastic particles have become a global problem, but their small size, irregular shapes, and varying material properties make detection extremely difficult. In this master's thesis, the author presents an overview of technologies currently used for microplastic detection. The thesis then outlines the design and construction of an optical measuring system capable of detecting microplastics in water flow. The process is divided into several phases, including problem analysis, conceptual design, solution concept creation and evaluation, selection of the best concept/solution, 3-D modeling, selection of suitable manufacturing technology, and measuring system production. To test the system, pre-prepared samples were used, divided into three subgroups based on size. Results were evaluated and compared to the classic method of measuring under a microscope. This work represents an important step towards improved detection and monitoring of microplastics, addressing a crucial environmental issue.
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