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Invention Detects Hidden Dried Plum Pits

Date:
January 6, 2007
Source:
USDA/Agricultural Research Service
Summary:
Festive gift trays of sweet, sun-ripened fruits often include delicious dried plums--also known as prunes. Agricultural Research Service (ARS) scientists in California have invented an inexpensive approach that dried plum processors can use to help ensure no large pieces of a plum's pit remain inside this fruit.

Festive gift trays of sweet, sun-ripened fruits often include delicious dried plums--also known as prunes. Agricultural Research Service (ARS) scientists in California have invented an inexpensive approach that dried plum processors can use to help ensure no large pieces of a plum's pit remain inside this fruit.

Agricultural engineers Eric S. Jackson, Ronald P. Haff and Thomas C. Pearson developed and tested the technology for about 1-1/2 years before deciding it was ready for processors to try. The researchers put thousands of tender, moist dried plums to the test in their laboratory experiments at the agency's Western Regional Research Center in Albany, Calif. Co-inventor Pearson is now with ARS in Manhattan, Kan.

The pit detector could be used as an inexpensive addition to processing lines already equipped with other detectors to find hidden pits or pit pieces.

Dried plums processed with the new device would be moved on a conveyor belt to a roller that gently presses them against the belt. A device known as a force transducer, mounted underneath the conveyor belt and in line with the roller, detects the amount of resistance that the roller encounters. The transducer's reading is sent to a signal processor that is linked to a computer.

Using a mathematical formula, or algorithm, that the scientists wrote, the computer determines whether the transducer's reading likely indicates the presence of a pit or pit piece. If that is the case, the signal processor instructs a sorter to remove the prune from the processing line, so it can be retested, hand-sorted or simply rejected.

The accuracy rate is impressive: false positives occur less than one percent of the time.

Though so far tested primarily at laboratory speeds, the device could easily be ramped up to processing plant rates. And, it could likely be used to check other dried stone fruits such as apricots, cherries and peaches.

The scientists received a patent for their invention earlier this year. Some dried fruit processors have already shown interest in it.

ARS is the U.S. Department of Agriculture's chief scientific research agency.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Invention Detects Hidden Dried Plum Pits." ScienceDaily. ScienceDaily, 6 January 2007. <www.sciencedaily.com/releases/2007/01/070102134300.htm>.
USDA/Agricultural Research Service. (2007, January 6). Invention Detects Hidden Dried Plum Pits. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2007/01/070102134300.htm
USDA/Agricultural Research Service. "Invention Detects Hidden Dried Plum Pits." ScienceDaily. www.sciencedaily.com/releases/2007/01/070102134300.htm (accessed July 25, 2014).

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