Campus Units

Agronomy

Document Type

Article

Publication Version

Published Version

Publication Date

2014

Journal or Book Title

Soil Science Society of America Journal

Volume

78

Issue

4

First Page

1146

Last Page

1152

DOI

10.2136/sssaj2013.11.0497

Abstract

Tangent-line methods and adaptive waveform interpretation with Gaussian filtering (AWIGF) have been proposed for determining reflection positions of time domain reflectometry (TDR) waveforms. However, the accuracy of those methods is limited for short-probe TDR sensors. Second-order bounded mean oscillation (BMO) may be an alternative method to determine reflection positions of short-probe TDR waveforms. For this study, an algorithm of second-order BMO is developed. Example waveforms are analyzed with tangent-line methods, AWIGF method, and second-order BMO to illustrate the difference among the three methods. For some waveforms, second-order BMO appears be able to give more plausible results. Automatic implementation was challenging for the second-order BMO. With second-order BMO, it is difficult to set a default threshold suitably for all TDR waveforms. Thus, manual adjustment may be required to select a suitable threshold for second-order BMO analysis

Comments

This article is published as Wang, Zhuangji, Yuki Kojima, Songtao Lu, Yan Chen, Robert Horton, and Robert C. Schwartz. "Time Domain Reflectometry Waveform Analysis with Second-Order Bounded Mean Oscillation." Soil Science Society of America Journal 78, no. 4 (2014): 1146-1152. doi: 10.2136/sssaj2013.11.0497. Posted with permission.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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