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Collaborative project: Quality improvement by optical selection of grapes harvested in steep slopes – Subproject 2
Project
Project code: 2814401108
Contract period: 01.08.2009
- 31.12.2012
Budget: 118,127 Euro
Purpose of research: Experimental development
The consequence of the climate change is a creeping alteration in viticulture. Increasing pH-values cause microbiological hazards. Primary, secondary and tertiary fungal infections lead to negative sensory changes as well as contamination with mycotoxines and biogenic amines. Limits for these substances are defined or in discussion. Insects like the Multicoloured Asian Lady Beetle Harmonia axyridis also cause off-flavours. Until now, selection of grapes after the harvest had no importance in German viticulture. Because of low concentration of rotten components, the financial efforts were too high. Harvesting by hand allowed the selection in the vineyard, but since more and more harvesting machines being used even in steep slope viticulture, an other solution must be found. Available systems of automatic mechanical sorting only partly fulfil the necessary criteria concerning efficiency, careful handling of the grapes and hygienic design. Sorting systems using optical methods - well known in food industry for years - are able to comply with the required criteria. These sorters operate with RGB colour camera and/or laser-induced fluorescence systems. Prior to sorting the machine has to be teached with 'good' and 'bad' product. A computer compares camera and laser pictures with the given data and sorts the grapes by blowing out bad product. Using the camera system, green and yellow berries can be separated to create different wine styles. Even the acceptable grade of rot on one berry can be defined. The processing in laser engineering is still going on. Chlorophyll detection via laser-induced fluorescence is now already a standard. In the near future, an analysis of each berry via NIR-laser (near infrared) at sorting speed should be possible.
Section overview
Subjects
- Viticulture
Funding programme
Excutive institution
Institute for Plant Protection in Fruit Crops and Viticulture - Fruit Cops (JKI-OW)
Funding institution
Project management agencies
Associated projects: optical sorting system for mechanically harvested grapes from steep slope vineyards
- Collaborative project: Quality improvement by optical selection of grapes harvested in steep slopes – Subproject 1
- Collaborative project: Quality improvement by optical selection of grapes harvested in steep slopes – Subproject 3
- Further optimization of an optical sorting system for mechanically harvested grapes from steep slope vineyards
