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Development of a Compact and Portable Terahertz Imaging System for Industrial Applications
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Researchers developed a compact, portable terahertz imaging device suitable for use outside the laboratory, demonstrating its ability to detect microplastics in soil among a range of other applications. While microplastic detection is one of several uses tested, the availability of low-cost, field-deployable detection technology could support faster and broader environmental monitoring of microplastic contamination.
Terahertz (THz) imaging, which employs THz radiation to see-through different materials, has a wide range of applications, from nondestructive evaluation to biomedical applications. However, typically, $\mathbf{T H z}$ imaging systems are limited to laboratory-level optical bench-based setups with sophisticated vibration isolators for efficient operation. The sensitive nature of various components of the THz imaging system has prevented its widespread usage in industrial in-field applications. Hence, the authors have developed a compact and portable terahertz imaging system suitable for in-field industrial applications. The various components of the system have been carefully selected, taking the ruggedness and low cost into consideration. The suitability of the portable THz imaging system to different application areas has been demonstrated, which includes security screening to detect concealing objects, nondestructive testing of composites, moisture detection in leaves, microplastics identification in soil, food quality assessment, porosity change assessment in pharmaceutical tablets, etc. These imaging results prove the capability of this system to be deployed in industrial field applications in the future.
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Scientists tested a new scanning method using special light waves (terahertz waves) to spot tiny plastic bits hiding in soil, without damaging the samples. The technique successfully detected plastic at different concentrations, offering a faster way to track microplastic pollution in the ground where our food grows, which matters since these plastics can eventually make their way into our bodies.
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Researchers used terahertz spectroscopy to detect and quantify low-density polyethylene microplastics mixed into soil at different concentrations, finding that the technique could distinguish contaminated from clean soil based on changes in refractive index and signal attenuation. Terahertz spectroscopy is non-destructive and rapid, making it a potentially valuable tool for in-field soil microplastic screening without the need for laboratory extraction.
Towards a fast and generalized microplastic quantification method in soil using terahertz spectroscopy
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Researchers compared terahertz and near-infrared spectroscopy for quantifying microplastics in soil, finding that terahertz spectroscopy offered a faster and more accurate approach than NIR for distinguishing household microplastics from standard reference polymers in soil matrices.
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Researchers developed a rapid method for detecting and quantifying microplastics in soil using terahertz time-domain spectroscopy combined with machine learning algorithms. The classification models achieved high accuracy in identifying different types of microplastics including polyethylene, polystyrene, and polypropylene. The study suggests that terahertz spectroscopy could provide a faster and more efficient alternative to current methods for monitoring microplastic contamination in agricultural soils.
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