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Technological challenges in developing a compact, spectrometer-free Raman system for microplastic detection
Summary
Scientists have designed a smaller, simpler version of a laser-based tool that can identify tiny plastic particles in drinking water, ditching the bulky equipment that normally makes this technology hard to use outside a lab. Early tests show the concept works, though the light-detecting parts need to get better before it's sensitive enough for real-world use. If perfected, this kind of compact device could one day be installed directly in water systems to continuously check for microplastic contamination, helping protect public health without waiting on slow lab testing.
Online monitoring of microplastics in drinking water is crucial for safeguarding public health and supporting evidence-based policy decisions. Despite the urgent need, no device has yet been reported that can provide the combined advantages of rapid operation, sensitivity, accuracy and compactness required for reliable monitoring across water distribution networks. Raman spectroscopy is a powerful technique for material identification, but conventional systems rely on bulky spectrometers that hinder their use in portable or field-deployable platforms. In this work, we present the design of a compact, spectrometer-free Raman system that eliminates the need for traditional dispersive elements. Instead, the system is based solely on optical filters and fast-response photodetectors, making it well-suited for miniaturization and integration into online monitoring setups. The feasibility of the approach was first evaluated through simulations in MATLAB and Ansys Zemax OpticStudio, which demonstrated successful identification of commonly encountered microplastic types, including polystyrene (PS), polyethylene (PE) and polyethylene terephthalate (PET). Following these promising results, a prototype of the proposed system was assembled and experimentally tested. The measurements confirmed the potential of the design, while also revealing limitations associated with the sensitivity and noise characteristics of currently available photodetectors. These findings not only validate the conceptual approach but also highlight the need for technological advancements in detector performance to fully realize the system’s capabilities. Overall, this study outlines a pathway toward the development of compact, spectrometer-free Raman systems that could enable real-time and distributed monitoring of microplastics in drinking water networks.