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In order to acquire synchronous multi-information in precision agriculture, a farm field information measurement instrument with GPS position function was developed. This instrument, which mainly consists of a single-chip microcomputer (SCM), a keyboard, a LCD display, several sensors and a GPS receiver, was designed to synchronously integrate the signals from both sensors and GPS receiver. In this...
For the purpose of rapid and nondestructive determination of soybean moisture content, a new measurement principle based on the dielectric properties of the measured plant material was proposed and a moisture measuring device making use of this principle was designed. The device was comprised of a sleeve capacitance in which the soybeans to be measured was packed, a signal generator and a signal measuring...
The implementation of a low cost driving electronic for a permittivity measurement system employing resonant microwave sensors is presented in this paper. The complete driving electronics needed to perform scalar measurements is described and its components are illustrated and characterized. The measurement results and accuracy have been compared with commercial devices showing similar performances
Dielectric properties of wheat samples, in which moisture equilibrium was upset by adding water, were tracked versus time in the frequency range between 5 GHz and 15 GHz at room temperature (23 degC). Results show an initial drop in the dielectric constant and loss factor, which reflects the initial stages of water binding, followed by a plateau indicating the final binding level of the water molecules...
The capacitive component of soil impedance is a good measure for the water content. For long time people use rod-shaped pairs of electrodes to measure electrically the water content in natural- and artificial soil. Especially in high-conductive mediums, with conductivity as high as 15 mS/cm, this technique is not able to acquire the capacitive component of the impedance reliably. Because of the necessary...
This paper presents a portable electrical instrument that measures the complex impedance of a parallel-plate capacitor with a sample of peanut kernels between its plates. The measured values were used in an empirical equation to estimate the moisture content (mc) of the sample. The estimated values were in good agreement with the mc values obtained by standard air-oven method. This method can be used...
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