The traditional direct moisture measurement method has a long period, and it is difficult to meet the requirements of modern production for speed and continuity. The non-electricity electricity measurement method is a more efficient moisture measurement method than the direct method, and is currently widely used.
In principle, grain moisture detection methods can include: resistance method, capacitance method, neutron method, microwave method, infrared method, nuclear magnetic resonance method, and the like. Considering the characteristics of the material object, the infrared method is mainly used for surface moisture measurement, and is mostly found in paper moisture detection. The neutron method and nuclear magnetic resonance method are based on the effect of hydrogen atoms in water, the system is complex, and the cost is high, which does not reflect the specificity of the test object. The microwave method uses the principle that the absorption of microwave energy by water or the microwave parameters acting on grain changes with the principle of moisture. The measured value is related to the material composition, and the measuring circuit and signal processing are complicated and the price is high. The resistance method has been the most commonly used moisture measurement method because of its fast, accurate, and low cost. However, the resistance method has the disadvantages of small signal intensity, high sampling requirements, and poor anti-interference.
In recent years, there have been many new innovative methods based on the principle of resistance measurement, such as two-range DC resistance method, pulse resistance method, complex impedance separation method, and AC impedance method. Based on the above research, this design innovatively proposes a data processing method based on pulse width measurement and resistance ratio method and measurement signal, which can quickly and accurately determine the moisture content.
We put the seeds in the circuit, as a resistor, in a certain range, the seed moisture is high, the dissolved material is increased, the ionization degree is increased, and the current is larger; otherwise, the current is smaller. However, the relationship between the two is not completely linear.
According to this principle, seed moisture can be determined. When the seed moisture is too low or too high, it is equivalent to open circuit or short circuit, and the instrument cannot measure it. Because the chemical composition of different crop seeds is different, when they contain the same moisture, the proportion of free water and irreducible water is different, the dissolved soluble substances are different, and the resistance is not completely consistent. Therefore, the specific dial or button of the tested crop should be selected before operation. . The resistance of the sample is affected by the temperature of the sample to be measured at the same time. When the moisture is constant, the temperature is high, the degree of ionization increases, the resistance decreases, and the measured value is high; otherwise, it is low. The general instrument is based on 20°C. When the reading is above or below 20°C, the reading must be corrected. Some instruments have been set for automatic calibration.
In principle, grain moisture detection methods can include: resistance method, capacitance method, neutron method, microwave method, infrared method, nuclear magnetic resonance method, and the like. Considering the characteristics of the material object, the infrared method is mainly used for surface moisture measurement, and is mostly found in paper moisture detection. The neutron method and nuclear magnetic resonance method are based on the effect of hydrogen atoms in water, the system is complex, and the cost is high, which does not reflect the specificity of the test object. The microwave method uses the principle that the absorption of microwave energy by water or the microwave parameters acting on grain changes with the principle of moisture. The measured value is related to the material composition, and the measuring circuit and signal processing are complicated and the price is high. The resistance method has been the most commonly used moisture measurement method because of its fast, accurate, and low cost. However, the resistance method has the disadvantages of small signal intensity, high sampling requirements, and poor anti-interference.
In recent years, there have been many new innovative methods based on the principle of resistance measurement, such as two-range DC resistance method, pulse resistance method, complex impedance separation method, and AC impedance method. Based on the above research, this design innovatively proposes a data processing method based on pulse width measurement and resistance ratio method and measurement signal, which can quickly and accurately determine the moisture content.
We put the seeds in the circuit, as a resistor, in a certain range, the seed moisture is high, the dissolved material is increased, the ionization degree is increased, and the current is larger; otherwise, the current is smaller. However, the relationship between the two is not completely linear.
According to this principle, seed moisture can be determined. When the seed moisture is too low or too high, it is equivalent to open circuit or short circuit, and the instrument cannot measure it. Because the chemical composition of different crop seeds is different, when they contain the same moisture, the proportion of free water and irreducible water is different, the dissolved soluble substances are different, and the resistance is not completely consistent. Therefore, the specific dial or button of the tested crop should be selected before operation. . The resistance of the sample is affected by the temperature of the sample to be measured at the same time. When the moisture is constant, the temperature is high, the degree of ionization increases, the resistance decreases, and the measured value is high; otherwise, it is low. The general instrument is based on 20°C. When the reading is above or below 20°C, the reading must be corrected. Some instruments have been set for automatic calibration.
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