The operating principle of the instrument used is based on spectrophotometric analysis of light. In contrast with traditional procedures, the measurement was performed continuously over the entire visible spectrum wavelengths, thus supplying a complete and accurate profile (6). The measuring equipment consisted of a stabilised halogen source and a reflectance probe; in this case, one end of the fibre was connected to the halogen source and the other to the spectrometer. Optical fibres were used to illuminate the must sample and acquire the reflected light. After calibration of the instrument, the fibre was immersed in the sample (object to measure) in an appropriate chamber in order to standardise the measurement and avoid interference from environmental light. In particular, the sample must be turbid to best exploit the light reflected by the sample itself, and for this reason the system was applied to samples of turbid grape must obtained from the sampling in the lorries with the sampling arm. The luminous impulse emitted by the source arrived at the extremity of the probe and interacted with the area to analyse; the result of this interaction was then collected by the same probe and transmitted to the spectrometer. The parameter “phenolic quality” measured instantly therefore becomes a tool that the oenologist can utilise both for vinification management and to define the vine-growing areas that are best for the production of quality red grapes

Procedimento per la valutazione della qualità delle uve rosse alla consegna in cantina e valutazione del succo in diversi momenti fino al caricamento dei serbatoi (1999). Brevetto Italiano UD 99 A 000086, 28/04/99, Università degli Studi di Udine, Brevetto Internazionale PCT/IB00/00514, WO/00/66986, 25/04/2000, EP 1175603, USA patent

CELOTTI, Emilio;
1999-01-01

Abstract

The operating principle of the instrument used is based on spectrophotometric analysis of light. In contrast with traditional procedures, the measurement was performed continuously over the entire visible spectrum wavelengths, thus supplying a complete and accurate profile (6). The measuring equipment consisted of a stabilised halogen source and a reflectance probe; in this case, one end of the fibre was connected to the halogen source and the other to the spectrometer. Optical fibres were used to illuminate the must sample and acquire the reflected light. After calibration of the instrument, the fibre was immersed in the sample (object to measure) in an appropriate chamber in order to standardise the measurement and avoid interference from environmental light. In particular, the sample must be turbid to best exploit the light reflected by the sample itself, and for this reason the system was applied to samples of turbid grape must obtained from the sampling in the lorries with the sampling arm. The luminous impulse emitted by the source arrived at the extremity of the probe and interacted with the area to analyse; the result of this interaction was then collected by the same probe and transmitted to the spectrometer. The parameter “phenolic quality” measured instantly therefore becomes a tool that the oenologist can utilise both for vinification management and to define the vine-growing areas that are best for the production of quality red grapes
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/671189
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