Internal defect scanning of sweetpotatoes using interactance spectroscopy

Abstract

While standard visible-light imaging offers a fast and inexpensive means of quality analysis of horticultural products, it is generally limited to measuring superficial (surface) defects. Using light at longer (near-infrared) or shorter (X-ray) wavelengths enables the detection of superficial tissue bruising and density defects, respectively; however, it does not enable the optical absorption and scattering properties of sub-dermal tissue to be quantified. This paper applies visible and near-infrared interactance spectroscopy to detect internal necrosis in sweetpotatoes and develops a Zemax scattering simulation that models the measured optical signatures for both healthy and necrotic tissue. This study demonstrates that interactance spectroscopy can detect the unique near-infrared optical signatures of necrotic tissues in sweetpotatoes down to a depth of approximately 5±0.5 mm. We anticipate that light scattering measurement methods will represent a significant improvement over the current destructive analysis methods used to assay for internal defects in sweetpotatoes.

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“…One of the most prominent, rapid and non-destructive testing methods for evaluating the external and internal quality attributes of various fruits and vegetables is the spectral imaging system using optical spectroscopy (11,12). Additionally, quantitative optical spectroscopic imaging is an attractive modality for various biomedical and clinical applications, and is a particularly promising technique for the non-invasive monitoring of patients in emergency clinical settings (e.g., ambulances, emergency rooms and operating rooms).…”

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“…Even more, near-infrared interactance spectroscopy has been used to detect internal necrosis in sweetpotatoes [Ipomoea batatas(L.) Lam.] (Kudenov et al, 2021). Infrared radiation or hyperspectral camera costs would present a bottleneck for large-scale deployment of this approach but has the potential to circumvent husking in the phenotyping process.…”