GPR System for Monitoring Paddy Moisture Content in Drying Process
Date Issued
2014
Date
2014
Author(s)
Huang, Wei-Jen
Abstract
In this study, GPR system was used to detect paddy moisture content in a static condition and a continuous drying process. In our preliminary experiments, the dielectric constant obtained by the GPR was influenced by the paddy moisture content and temperature, but the paddy thickness was statistically insignificant. The mathematical model for the dielectric constant of paddy by Nelson and Noh was found to be applicable in estimating the dielectric constant of paddy in our experiments.
In the continuous drying experiment, the dielectric constant of paddy measured by the GPR was significantly influenced by temperature. As the temperature changed during the drying process, a temperature correction factor developed by Lawrence et al. [27] was adopted to model the temperature effect. After the introduction of the factor, the dielectric constants measured in this study matched well with the theoretical data calculated from the mathematical model by Nelson and Noh.[29]
In a continuous drying process, the dielectric constant of paddy measured by the GPR is affected by many factors such as moisture content, temperature, and bulk density. In this study, a numerical method was used to estimate the real-time moisture content by measuring the dielectric constant and temperature during the paddy drying process. The estimated results showed good agreement with data obtained by the oven method. This demonstrates the potential of application of the GPR system in real time monitoring of paddy moisture content during the drying process.
Subjects
透地雷達
稻穀
含水率
介電常數
乾燥
Type
thesis
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