Compact fluorosensor for close-range remote-sensing characterization of fruits

Qiang Zhang; Yuting Sun; Sune Svanberg

doi:10.1117/12.2628584

16 February 2022 Compact fluorosensor for close-range remote-sensing characterization of fruits

Qiang Zhang, Yuting Sun, Sune Svanberg

Author Affiliations +

Proceedings Volume 12164, International Conference on Optoelectronic Materials and Devices (ICOMD 2021); 1216403 (2022) https://doi.org/10.1117/12.2628584
Event: 2021 International Conference on Optoelectronic Materials and Devices, 2021, Guangzhou, China

Abstract

The ripeness of fruits is commonly assessed by the visual appearance, but this method is not very accurate and there can be a large variability. We have developed a hand-held sensor based on laser-induced fluorescence to provide more objective guidance. The instrument incorporates a 412 nm continuous wave semiconductor laser and a miniature spectrometer. It was used for monitoring of tropical fruits growing on the tree, and high-quality spectra could be recorded at ranges of 1-2 meters. The spectra feature characteristic dual-peaked emission peaks in the near-IR region due to chlorophyll, as well as blue-green signals due to further pigments. Further, natural waters were studied and showed strong differentiation effects.

Citation Download Citation

Qiang Zhang, Yuting Sun, and Sune Svanberg "Compact fluorosensor for close-range remote-sensing characterization of fruits", Proc. SPIE 12164, International Conference on Optoelectronic Materials and Devices (ICOMD 2021), 1216403 (16 February 2022); https://doi.org/10.1117/12.2628584

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