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Broadband Complex Dielectric Characterization of Soils by Time Domain Reflectometry

  • Yin Jeh Ngui
  • Chih-Ping LinEmail author
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Recent implementation of environmental geophysical exploration technique in rapid detection and evaluation of soil contamination is widely involved. Typical soil contaminants tend to alter the pore fluid and hence the variation of soil electrical properties, the transmission path of electrical currents or electromagnetic waves may be affected within the contaminated region. This in turn provided the detection basis of the electrical and electromagnetism geophysical methods. As contaminated soils consisted of composite materials of three or four phases, the relationship between their electrical properties and water content, porosity, contaminant concentration are relatively complex. The demand for a wide electrical spectral range has hence arisen for contaminated soil characterization. This study proposed an innovative time domain reflectometry (TDR) approach, in order to measure a broadband complex dielectric spectrum (including both real and imaginary parts of complex dielectric permittivity, CDP) within MHz–GHz frequency range and to perform a more complete electrical characterization of contaminated soil. The robustness, in-situ applicability, and performance of the proposed method is verified using series of laboratorial and in-situ experiments, involving various contaminants. The measurement system can be setup, calibrated, and operated easily, holding great potential for better hydrophysical and environmental characterization of soils.

Keywords

Electrical property Complex dielectric permittivity Dielectric spectroscopy Time domain reflectometry 

References

  1. Dobson M, Ulaby F, Hallikainen M, El-rayes M (1985) Microwave dielectric behavior of wet soil-Part II: dielectric mixing models. IEEE Trans Geosci Remote Sens GE 23(1):35–46.  https://doi.org/10.1109/tgrs.1985.289498CrossRefGoogle Scholar
  2. Frigo M, Johnson SG (1998) FFTW: an adaptive software architecture for the FFT. In: Proceedings of the 1998 IEEE international conference on acoustics, speech and signal processing, pp. 1381–1384. IEEE (1998)Google Scholar
  3. Heimovaara TJ (1994) Frequency domain analysis of time domain reflectometry waveforms: 1. Measurement of the complex dielectric permittivity of soils. Water Resour Res 30(2):189–199.  https://doi.org/10.1029/93wr02948CrossRefGoogle Scholar
  4. Lin C-P, Ngui YJ, Lin C-H (2018) Multiple reflection analysis of TDR signal for complex dielectric spectroscopy. IEEE Trans Instrum Meas 1–13.  https://doi.org/10.1109/tim.2018.2822404
  5. Topp GC, Zegelin S, White I (2000) Impacts of the real and imaginary components of relative permittivity on time domain reflectometry measurements in soils. Soil Sci Soc Am J 64(4):1244.  https://doi.org/10.2136/sssaj2000.6441244xCrossRefGoogle Scholar
  6. Tukey JW (1967) An introduction to the calculations of numerical spectrum analysis. In: Spectral Analysis of Time Series, pp 25–46Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringNational Chiao Tung UniversityHsinchuTaiwan

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