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Mizrach, A., Inst of Agricultural Engineering, Bet Dagan, Israel
Nahir, D., Inst of Agricultural Engineering, Bet Dagan, Israel
Ronen, B., Inst of Agricultural Engineering, Bet Dagan, Israel
A 3-mm-diameter pin was used as a mechanical thumb to sense firmness of orange fruit and tomatoes. Two firm measuring devices were developed: one - based on the Go-No-Go Method to differentiate between firm and soft oranges, and the other - based on the Continuous Deformation Method to differentiate among hard-green, firm-red, and soft-red tomatoes. An online singulator-orientor machine, equipped with a firmness sensing device to distinguish between firm and soft orange fruits and to grade tomatoes in firmness groups, were built and tested. The machine stiffness-readings of tomatoes, as relates to manual grading, was discussed. The difference between firmness means was significant at the level of 1%. All of the red-firm tomatoes could easily distinguish from 100% of the green ones and from 52% of the turning-red tomatoes. A comparison between the machine firmness test and the manual test for Shamouti oranges was conducted. The machine test indicated a relatively high accuracy in firmness readings [coeff. of variation (CV) was found from 1.6% to 4.3%].
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Mechanical thumb sensor for fruit and vegetable sorting
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Mizrach, A., Inst of Agricultural Engineering, Bet Dagan, Israel
Nahir, D., Inst of Agricultural Engineering, Bet Dagan, Israel
Ronen, B., Inst of Agricultural Engineering, Bet Dagan, Israel
Mechanical thumb sensor for fruit and vegetable sorting
A 3-mm-diameter pin was used as a mechanical thumb to sense firmness of orange fruit and tomatoes. Two firm measuring devices were developed: one - based on the Go-No-Go Method to differentiate between firm and soft oranges, and the other - based on the Continuous Deformation Method to differentiate among hard-green, firm-red, and soft-red tomatoes. An online singulator-orientor machine, equipped with a firmness sensing device to distinguish between firm and soft orange fruits and to grade tomatoes in firmness groups, were built and tested. The machine stiffness-readings of tomatoes, as relates to manual grading, was discussed. The difference between firmness means was significant at the level of 1%. All of the red-firm tomatoes could easily distinguish from 100% of the green ones and from 52% of the turning-red tomatoes. A comparison between the machine firmness test and the manual test for Shamouti oranges was conducted. The machine test indicated a relatively high accuracy in firmness readings [coeff. of variation (CV) was found from 1.6% to 4.3%].
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