Analysis of Methods Used in Time Domain Reflectometry Response

摘要: Time domain reflectometry (TDR) is a new technique that can be used to measure indirectly the in situ volumetric moisture content of soil. A growing body research has been conducted providing variety prediction equations estimate using dielectric constant calculated from apparent length obtained TDR reader. However, limited determine which several available procedures should obtain response calculating constant. As result, evaluating procedure yields most accurate assessment soils object this paper. There are five known methods analyzing responses. They method tangents, peaks, diverging lines, alternate and Campbell scientific method. Twenty-eight soil samples, FHWA seasonal monitoring program, were throughout United States Canada laboratory study. Three levels compaction initially planned for use with each sample. total 361 data points eventually analyze The tangents proved estimating content. Current studies ongoing provide improved multiple regression models on highway soils.