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Sensors 2011, 11(9), 8295-8308;

The Effect on Wireless Sensor Communication When Deployed in Biomass

Department of Engineering, Aarhus University, Blichers Alle 20, P. O. Box 50, Tjele DK-8830, Denmark
Faculty of Engineering, Institute of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Odense DK-5230, Denmark
Department of Engineering, Aarhus University, Ny Munkegade 120, Building 1521, Aarhus C DK-8000, Denmark
Author to whom correspondence should be addressed.
Received: 1 August 2011 / Revised: 22 August 2011 / Accepted: 23 August 2011 / Published: 25 August 2011
(This article belongs to the Special Issue Sensors in Agriculture and Forestry)
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Wireless sensor networks (WSN) have been studied in a variety of scenarios over recent years, but work has almost exclusively been done using air as the transmission media. In this article some of the challenges of deploying a WSN in a heterogeneous biomass, in this case silage, is handled. The dielectric constant of silage is measured using an open-ended coaxial probe. Results were successfully obtained in the frequency range from 400 MHz to 4 GHz, but large variations suggested that a larger probe should be used for more stable results. Furthermore, the detuning of helix and loop antennas and the transmission loss of the two types of antennas embedded in silage was measured. It was found that the loop antenna suffered less from detuning but was worse when transmitting. Lastly, it is suggested that taking the dielectric properties of silage into account during hardware development could result in much better achievable communication range. View Full-Text
Keywords: WSN; permittivity; transmission loss; detuning; biomass storage WSN; permittivity; transmission loss; detuning; biomass storage

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Larsen, J.J.; Green, O.; Nadimi, E.S.; Toftegaard, T.S. The Effect on Wireless Sensor Communication When Deployed in Biomass. Sensors 2011, 11, 8295-8308.

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