针对电阻法和电容法无法回避阻容间相互干扰而导致精度难以提高的瓶颈问题，开展湿型砂射频介电特性和含水量研究，提出快速测量湿型砂含水量的新方法——射频介电特性法。采用理论与试验相结合的方法，重点研究①湿型砂的射频介电特性和新方法能够更为准确测量含水量的机理，②多针式湿型砂传感器探头及阻抗特性，③射频激励源参数、粘土、煤粉、温度等对射频介电特性法的影响规律，④射频介电特性参数与湿型砂含水量的关系，并建立湿型砂含水量求解模型，实现基于射频介电特性的湿型砂含水量的快速测量。解决①射频介电特性法为何能更准确测量湿型砂含水量，②探头结构如何影响其阻抗特性和测量敏感度，③湿型砂其他组分和堆积密度对射频介电特性法有何影响，④射频介电特性参数与含水量间具有何种关系等四个科学问题。项目实施后，不但显著提升湿型砂含水量的测量精度，更从理论和应用上提供一种新方法，对丰富湿型砂含水量的测量理论和方法具有重要科学意义。

In view of the bottleneck problem that the moisture measuring precision of the resistance and capacitance methods is difficult to be improved because of mutual interfere between them, the theory and method of measuring the moisture content of green sand is studied, and a new fast method – Radio Frequency Dielectric Characteristic Method is put forward. By the combination of theory and experiment, the project will mainly study: (1) the radio frequency dielectric characteristics of green sand and the mechanism of this new method accurately measuring the moisture content, (2) multi-pin sensor probe of green sand and its impedance characteristics, (3) the influence rule of radio frequency excitation source parameters, clay, coal and temperature on the new method, (4) the relationship between radio frequency dielectric characteristic parameter and moisture content of green sand, and the model of calculating moisture content is established. It will realize the goal of accurately measuring moisture content of green sand by new method. Four scientific questions will be solved: (1) Why can the new method accurately measure moisture content of green sand? (2) How does the probe structure affect impedance characteristics and measuring sensitivity? (3) How do the other components and bulk density of green sand affect the new method? (4) What is the relation between characteristic parameter and moisture content? The implementation of this project will not only greatly increase the measuring accuracy of moisture content of green sand, but also provide a new method on the theory and application, which has very important scientific significance for enriching the measuring theory and method of moisture content of green sand.