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Identification of microplastics in a large water volume by integrated holography and Raman spectroscopy
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A new technique combining holography and Raman spectroscopy was demonstrated to identify plastic pellets suspended in a large volume of water without physical contact. This non-destructive approach could enable real-time, in-water microplastic detection for environmental monitoring.
A noncontact method to identify sparsely distributed plastic pellets is proposed by integrating holography and Raman spectroscopy in this study. Polystyrene and poly(methyl methacrylate) resin pellets with a size of 3 mm located in a 20 cm water channel were illuminated using a collimated continuous wave laser beam with a diameter of 4 mm and wavelength of 785 nm. The same laser beam was used to take a holographic image and Raman spectrum of a pellet to identify the shape, size, and composition of material. Using the compact system, the morphological and chemical analysis of pellets in a large volume of water was performed. The reported method demonstrates the potential for noncontact continuous in situ monitoring of microplastics in water without collection and separation.
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Researchers demonstrated that digital holography can identify and characterize microplastic particles in water samples, providing a label-free, high-throughput alternative to Raman or infrared spectroscopy. The technique reconstructs three-dimensional information about particle shape and optical properties, improving classification accuracy. This optical method could enable faster and cheaper microplastic analysis in environmental monitoring programs.
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A holographic imaging approach was developed and evaluated for automated detection and characterization of microplastics in liquid samples, using holographic features to distinguish plastic particles from other matter. The method offers a path toward rapid, high-throughput microplastic identification in complex water samples without laborious manual microscopy.
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Researchers developed a comprehensive holography-based system for identifying and classifying microparticles — including microplastics — in water samples using microscopic holographic projections, designed for researchers without specialist holography expertise. The system is deployable as part of an autonomous sailboat robot for large-scale environmental monitoring of diverse microplastic types in water bodies.
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Researchers demonstrated that digital holography microscopy can identify microplastics in water by generating a unique phase-contrast "fingerprint" from coherent light, offering a promising non-destructive imaging technique for mapping microplastic distribution and abundance in water samples.
Searching and identifying microplastics in marine environment by digital holography⋆
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Researchers demonstrated that digital holography can non-invasively detect and reconstruct the three-dimensional shapes of different microplastic types in water, including in the presence of biological matter such as diatoms, offering a promising new optical tool for environmental monitoring.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.