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Evaluation of an optical sensor for tuber yield monitoring

  • Robert Gustafson (Prof. Emeritus)
Publiceringsår: 2004
Språk: Engelska
Sidor: 1851-1856
Publikation/Tidskrift/Serie: Transactions of ASAE
Volym: 47
Nummer: 5
Dokumenttyp: Artikel
Förlag: ASAE


A sensor for monitoring the yield of tubers was tested in the laboratory and in the field. The laboratory test was
designed to investigate whether the sensor varied in its measurements of tuber size, whether the recorded size differed within
the width of the sensor, and whether tilting of the sensor affected the result. The test objects were spheres, and measurements
were carried out on three different sizes. A statistical analysis showed how the sensor measured the sizes for the different combinations
of size, position, and inclination. In the field, a harvester−mounted sensor was used to monitor yield of Bintje potatoes
in terms of tuber size and weight. The results obtained were compared with those from mechanical load−cell
measurements. An expression relating tuber size to weight was determined. Plot−harvesting tubers provided data for evaluation
of tuber size in relation to yield. The results showed that the errors in size determination by the sensor were in the order
of 1% to 2%. Different size classes were well differentiated. Some differences were noted for object position and sensor inclination.
Field tests showed that the mean deviation from measured weight was about 1%. It was concluded that sensor errors
were small and that the sensor could discriminate between different sizes for the spheres used in the study. In the field, the
sensor worked with good consistency and is a potential option for tuber yield monitoring.



  • Agriculture and Food Sciences
  • Tuber
  • Yield monitoring
  • Optical Sensor
  • Potato


  • ISSN: 0001−2351

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