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

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: 113-118.

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Author Misra, R.K.
Padhi, J.
Payero, J.O.
Title A calibration procedure for load cells to improve accuracy of mini-lysimeters in monitoring evapotranspiration
Journal name Journal of Hydrology  (ERA 2012 Listed)    (ERA 2010 Rank A*)   Check publisher's open access policy
Publication date 2011-08-18
Sub-type Article
DOI 10.1016/j.jhydrol.2011.06.009
Volume number 406
Issue number 1-2
ISSN 0022-1694
Start page 113
End page 118
Total pages 6
Place of publication Netherlands
Publisher Elsevier BV
Collection year 2012
Language eng
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.
Keyword Crops
ET
Evapotranspiration
Irrigation
Load cell
Lysimeter
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article
Collections: Official 2012 Collection
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Thu, 20 Oct 2011, 13:06:37 EST by Dr Jose Payero Rodriguez on behalf of Qld Alliance for Agriculture and Food Innovation