Date of Award
Master of Science
Time domain reflectometry (TDR) is a well-established electromagnetic technique used to estimate in situ soil water content, and thermo-TDR is an extension of the traditional TDR, which can measure both soil water content and thermal properties. Tangent line methods and adaptive waveform interpretation with Gaussian filters (AWIGF) are used in traditional TDR waveform analysis. However, due to the short probe design of thermo-TDR, those methods may not perform well.
In this thesis, we present an alternative method in TDR waveform analysis based on the second order bounded mean oscillation (BMO) operator. Numerical analysis and laboratory calibration tests show that the second order BMO can return reasonable results compared with tangent line methods and AWIGF. Second order BMO analysis also performs well for some challenging waveforms. The second order BMO method is not totally automatic due to the large variation of TDR waveforms, and manual adjustment of some parameters is necessary. A MATLAB program of the implementation of second order BMO method is developed, and instructions for users of the program is also provided. The results show that second order BMO is a valid alternative method for TDR waveform analysis.
Wang, Zhuangji, "Time domain reflectometry waveform analysis with second order bounded mean oscillation" (2015). Graduate Theses and Dissertations. 14466.