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

Application of Terahertz Radiation to Soil Measurements: Initial Results

1 Department Engineering for Crop Production, Leibniz-Institute for Agricultural Engineering, Max-Eyth-Allee 100, 14469 Potsdam, Germany 2 German Aerospace Center (DLR), Institute for Planetary Research, Experimental Planetary Physics (XP), Rutherfordstr. 2, 12489 Berlin, Germany
* Author to whom correspondence should be addressed.
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)
PDF Full-text Download PDF Full-Text [5337 KB, Updated Version, uploaded 24 October 2011 14:10 CEST]
The original version is still available [5441 KB, uploaded 21 October 2011 14:28 CEST]
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

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

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.

Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert