Abstract
Grain moisture is one of the key indexes of grain quality, and acquiring an accurate moisture value is critical for grain storage security. However, the sensors used in the traditional methods for testing grain moisture are based on capacitance, microwave, or radio-frequency methods and still exhibit low accuracy and instability because they are susceptible to the temperature, moisture, and micro gas flow of the air in the granary. In this study, we employed a new design for a radio-frequency moisture sensor for grain. The structure of the sensor is based on the difference method and consists of two parallel probe units. These units are at different distances to the tested grain, resulting in different sensitivities in the moisture measurements. Through a phase difference operation on the test signals, the disturbance variable was reduced. The specific size of the two parallel probes was confirmed by calculation and simulation using High Frequency Structure Simulator (HFSS) software. The simulated and measured parameters of a prototype sensor agreed well. The linear relationship yielded a correlation coefficient of 0.9904, and the average error of the moisture testing was within ±0.3% under the conditions where the VSWR (voltage standing wave ratio) value and return losses were 1.5896 and −20 dB, respectively, at a measured central frequency of 100 MHz. The results indicate that the performance of the sensor was excellent.
Highlights
Moisture is one of the key values of grain that needs to be controlled during the storage process, owing to its close link with the quality of grain, i.e., grain with high moisture is readily susceptible to microorganisms [1]
The use of sensors for grain moisture online testing has been limited owing to commonly occurring shortcomings, such as low accuracy, instability, and a high fault rate
Traditional sensors for grain moisture online testing were designed based on capacitance technology, and there have been some new developments based on technologies, including microwave, radio frequency, nuclear magnetic resonance, and frequency-domain detection [3]
Summary
Moisture is one of the key values of grain that needs to be controlled during the storage process, owing to its close link with the quality of grain, i.e., grain with high moisture is readily susceptible to microorganisms [1]. The testing of grain moisture is a significant method of securing stored grains [2]. Testing grain moisture in an accurate and stable way is significant for the grain industry. The use of sensors for grain moisture online testing has been limited owing to commonly occurring shortcomings, such as low accuracy, instability, and a high fault rate. Traditional sensors for grain moisture online testing were designed based on capacitance technology, and there have been some new developments based on technologies, including microwave, radio frequency, nuclear magnetic resonance, and frequency-domain detection [3]
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