The linear correlation data showed agreement with data generated from a fluorometer. The device was applied in detection of ethylene generated from apples, avocados, and bananas. The images are processed with a dedicated smartphone application for RGB analysis and ethylene concentration. The device is portable (18 cm × 8 cm × 6 cm) with an inbuilt power supply and replaceable optical fiber sensor tip. The common gases in the warehouse had no significant interference with the results. Paired with a pyrene-tagged Grubbs catalyst (PYG) probe, our SOFS showed a wide linearity range up to 350 ppm with a detection limit of 0.6 ppm.
For rapid and portable detection of ethylene in commercial fruit ripening storage rooms, we designed a smartphone-based optical fiber sensor (SOFS), which is composed of a 15 mW 365 nm laser for fluorescence signal excitation and a bifurcated fiber system for signal flow direction from probe to smartphone.
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