Res. Agr. Eng., 2007, 53(4):149-154 | DOI: 10.17221/1959-RAE

Dynamic laboratory measurement with dielectric sensor for forage mass flow determination

F. Kumhála1, Z. Kvíz1, J. Kmoch1, V. Prošek2
1 Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic
2 Department of Machines Utilization, Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic

A new parallel plate capacitance sensor was built consisting of two metal sheets. The sensor - a capacitor and the whole oscillating circuit was driven at 27 MHz frequency. Dynamic laboratory experiments were performed with grass from a natural meadow in order to evaluate the possibility of the forage mass flow determination by means of this sensor. The results revealed a relatively strong linear relationship between the feed rates of the wet forage crop material passing through the sensor between its plates and the measured capacitance sensor circuit output frequency. The coefficients of determination (R2) varied from 0.9 to 0.96. Further improvement of the electronic circuit connection and further investigation of the sensor can be recommended.

Keywords: precision agriculture; yield mapping; capacitance sensor; mass flow; grass and forage

Published: December 31, 2007  Show citation

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Kumhála F, Kvíz Z, Kmoch J, Prošek V. Dynamic laboratory measurement with dielectric sensor for forage mass flow determination. Res. Agr. Eng. 2007;53(4):149-154. doi: 10.17221/1959-RAE.
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    References

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