Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
Sensitivity Analysis for VHF Dielectric Grain Moisture Measurements
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 033136, 2003 ASAE Annual Meeting . (doi: 10.13031/2013.14073) @2003
Authors: Zoltán Gillay, David B. Funk
Keywords: dielectric properties, mathematical models, finite element analysis, grain moisture, test cell design
A VHF moisture measurement algorithm that provides "unified" calibrations for many grain types was described in a presentation at the 2001 ASAE Annual Meeting. This presentation reports on further developments in this work--particularly focusing on a detailed sensitivity analysis of the VHF moisture measurement method and the implications of the sensitivity analysis for the development of practical commercial instruments. Finite element analysis, signal flow graphs, and sample measurements were used to investigate several critical aspects of the transmission line test cell including: electrode spacing, length of grain-filled section, shields and dielectric materials in proximity to the test cell, and effective versus actual dielectric constant.(Download PDF) (Export to EndNotes)