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Sensors 2015, 15(2), 3688-3705;

Development of the Second Generation Berry Impact Recording Device (BIRD II)

College of Engineering, The University of Georgia, 200 D.W. Brooks Drive, Athens, GA 30602, USA
Author to whom correspondence should be addressed.
Received: 6 December 2014 / Revised: 4 January 2015 / Accepted: 30 January 2015 / Published: 5 February 2015
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [1308 KB, uploaded 9 February 2015]


To quantitatively measure the impacts during blueberry harvesting and post-harvest handling, this study designed the second generation Berry Impact Recording Device (BIRD II) sensor with a size of 21 mm in diameter and a weight of 3.9 g, which reduced the size by 17% and the weight by 50% compared to the previous prototype. The sensor was able to measure accelerations up to 346 g at a maximum frequency of 2 KHz. Universal Serial Bus (USB) was used to directly connect the sensor with the computer, removing the interface box used previously. LabVIEW-based PC software was designed to configure the sensor, download and process the data. The sensor was calibrated using a centrifuge. The accuracy of the sensor was between –1.76 g to 2.17 g, and the precision was between 0.21 g to 0.81 g. Dynamic drop tests showed that BIRD II had smaller variance in measurements than BIRD I. In terms of size and weight, BIRD II is more similar to an average blueberry fruit than BIRD I, which leads to more accurate measurements of the impacts for blueberries. View Full-Text
Keywords: sensing system; blueberry; accelerometer; instrumented sphere; microcontroller sensing system; blueberry; accelerometer; instrumented sphere; microcontroller
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xu, R.; Li, C. Development of the Second Generation Berry Impact Recording Device (BIRD II). Sensors 2015, 15, 3688-3705.

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