Monitoring the grape ripening until the harvest is a crucial issue since berry quality is closely related to it. Therefore, the research for non-destructive methods which could explore many samples and give a rapid and comprehensive overview of ripening would be helpful. The aim of the research was to design, build and test prototypes of a low-cost and user-friendly device to support small-scale winegrowers in planning the optimal harvest date according to grape ripening degree. A pre-prototype version of a fully integrated, stand-alone optical device which incorporates sensors (tuned photodiode arrays, interference filters, LEDS, optics) was presented. The system is equipped with two digital 6-channel sensors for spectral identification in the visible and SW-NIR. The sensors cover 12 independent on-device optical filters from 450 nm to 860 nm. It was tested on Nebbiolo grape red variety. The optical data were collected on grape bunches and single grape berries using the pre-prototype. Besides, reference parameters of Soluble Solids Content (SSC), Titratable Acidity (TA), Extractability of Anthocyanins (EA) and pH were carried out on each sample. The MLR correlation models between the optical data from the prototypes and the reference parameters were calculated. Promising results were obtained for the prediction of SSC on single berries (r2cv=0.86), while the prediction of ripeness parameters on bunches were slightly poor (r2cv from 0.4 to 0.5), nevertheless they can be considered enough accurate to allow an initial field screening of the trend of these parameters.

Design of prototypes of LED based devices for the evaluation of grape (Vitis Vinifera L.) ripeness / R. Beghi, V. Giovenzana, A. Tugnolo, A. Casson, R. Guidetti. ((Intervento presentato al 6. convegno International Symposium on Modeling in Horticultural Supply Chain tenutosi a Molfetta nel 2019.

Design of prototypes of LED based devices for the evaluation of grape (Vitis Vinifera L.) ripeness

Roberto Beghi;Valentina Giovenzana;Alessio Tugnolo;Andrea Casson;Riccardo Guidetti
2019-06

Abstract

Monitoring the grape ripening until the harvest is a crucial issue since berry quality is closely related to it. Therefore, the research for non-destructive methods which could explore many samples and give a rapid and comprehensive overview of ripening would be helpful. The aim of the research was to design, build and test prototypes of a low-cost and user-friendly device to support small-scale winegrowers in planning the optimal harvest date according to grape ripening degree. A pre-prototype version of a fully integrated, stand-alone optical device which incorporates sensors (tuned photodiode arrays, interference filters, LEDS, optics) was presented. The system is equipped with two digital 6-channel sensors for spectral identification in the visible and SW-NIR. The sensors cover 12 independent on-device optical filters from 450 nm to 860 nm. It was tested on Nebbiolo grape red variety. The optical data were collected on grape bunches and single grape berries using the pre-prototype. Besides, reference parameters of Soluble Solids Content (SSC), Titratable Acidity (TA), Extractability of Anthocyanins (EA) and pH were carried out on each sample. The MLR correlation models between the optical data from the prototypes and the reference parameters were calculated. Promising results were obtained for the prediction of SSC on single berries (r2cv=0.86), while the prediction of ripeness parameters on bunches were slightly poor (r2cv from 0.4 to 0.5), nevertheless they can be considered enough accurate to allow an initial field screening of the trend of these parameters.
Settore AGR/09 - Meccanica Agraria
ISHS - International Society for Horticultural Science
Design of prototypes of LED based devices for the evaluation of grape (Vitis Vinifera L.) ripeness / R. Beghi, V. Giovenzana, A. Tugnolo, A. Casson, R. Guidetti. ((Intervento presentato al 6. convegno International Symposium on Modeling in Horticultural Supply Chain tenutosi a Molfetta nel 2019.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/650304
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