A calibration procedure for load cells to improve accuracy of mini-lysimeters in monitoring evapotranspiration

Article

Misra, R. K., Padhi, J. and Payero, J. O.. 2011. "A calibration procedure for load cells to improve accuracy of mini-lysimeters in monitoring evapotranspiration." Journal of Hydrology. 406 (1-2), pp. 113-118. https://doi.org/10.1016/j.jhydrol.2011.06.009
Article Title

A calibration procedure for load cells to improve accuracy of mini-lysimeters in monitoring evapotranspiration

ERA Journal ID1949
Article CategoryArticle
AuthorsMisra, R. K. (Author), Padhi, J. (Author) and Payero, J. O. (Author)
Journal TitleJournal of Hydrology
Journal Citation406 (1-2), pp. 113-118
Number of Pages6
Year2011
PublisherElsevier
Place of PublicationAmsterdam, Netherlands
ISSN0022-1694
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jhydrol.2011.06.009
Web Address (URL)http://www.elsevier.com/locate/jhydrol
Abstract

We used twelve load cells (20 kg capacity) in a mini-lysimeter system to measure evapotranspiration simultaneously from twelve plants growing in separate pots in a glasshouse. A data logger combined with a multiplexer was used to connect all load cells with the full-bridge excitation mode to acquire load-cell signal. Each load cell was calibrated using fixed load within the range of 0-0.8 times the full load capacity of load cells. Performance of all load cells was assessed on the basis of signal settling time, excitation compensation, hysteresis and temperature. Final calibration of load cells included statistical consideration of these effects to allow prediction of lysimeter weights and evapotranspiration over short-time intervals for improved accuracy and sustained performance. Analysis of the costs for the mini-lysimeter system indicates that evapotranspiration can be measured economically at a reasonable accuracy and sufficient resolution with robust method of load-cell calibration.

Keywordscrops; evaportranspiration; ET; irrigation; load cell; lysimeter
ANZSRC Field of Research 2020490102. Biological mathematics
510501. Biological physics
300101. Agricultural biotechnology diagnostics (incl. biosensors)
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsAustralian Centre for Sustainable Catchments
National Centre for Engineering in Agriculture
Department of Agriculture and Fisheries, Queensland
Institution of OriginUniversity of Southern Queensland
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