Sensors 2011, 11(10), 9973-9988; doi:10.3390/s111009973

Application of Terahertz Radiation to Soil Measurements: Initial Results

Received: 22 August 2011; in revised form: 13 October 2011 / Accepted: 13 October 2011 / Published: 21 October 2011
(This article belongs to the Section Physical Sensors)
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.
Abstract: Developing soil sensors with the possibility of continuous online measurement is a major challenge in soil science. Terahertz (THz) electromagnetic radiation may provide the opportunity for the measurement of organic material density, water content and other soil parameters at different soil depths. Penetration depth and information content is important for a functional soil sensor. Therefore, we present initial research on the analysis of absorption coefficients of four different soil samples by means of THz transmission measurements. An optimized soil sample holder to determine absorption coefficients was used. This setup improves data acquisition because interface reflections can be neglected. Frequencies of 340 GHz to 360 GHz and 1.627 THz to 2.523 THz provided information about an existing frequency dependency. The results demonstrate the potential of this THz approach for both soil analysis and imaging of buried objects. Therefore, the THz approach allows different soil samples to be distinguished according to their different absorption properties so that relations among soil parameters may be established in future.
Keywords: THz; transmission measurement; soil sensor; soil absorption; imaging; buried objects; soil parameters
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MDPI and ACS Style

Dworak, V.; Augustin, S.; Gebbers, R. Application of Terahertz Radiation to Soil Measurements: Initial Results. Sensors 2011, 11, 9973-9988.

AMA Style

Dworak V, Augustin S, Gebbers R. Application of Terahertz Radiation to Soil Measurements: Initial Results. Sensors. 2011; 11(10):9973-9988.

Chicago/Turabian Style

Dworak, Volker; Augustin, Sven; Gebbers, Robin. 2011. "Application of Terahertz Radiation to Soil Measurements: Initial Results." Sensors 11, no. 10: 9973-9988.

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