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本文研究了利用微波微带传输线的原理测定土壤含水量,并对其原理、方法和传感器的结构进行了试验,得出了较好的结果。不同含水量的土壤,其介电常数具有明显的差异。当湿土放置在微带线上时,部分微波能量被耦合进入湿土,引起能量损耗,这种插入损耗与土壤含水量之间有着良好的依存关系。由于其实质是测定湿土的介电常数,在测量过程中土壤温度、化学成分的影响可以忽略,而且被测土壤样品量不受限制,同时又具有足够的灵敏度,测量方法简单,所以微带法具有一定的精度及简单快速和使用方便的优点,较好的解决了利用微波透射法测量含水量仪器存在的主要问题,仪器还适用于测定其它各种均匀物质含水量,而且可满足较高的精度要求。
In this paper, the principle of microwave microstrip transmission line was used to determine the soil water content. The principle, method and structure of the sensor were tested, and the better results were obtained. Different soil moisture content, the dielectric constant has obvious differences. When the wet soil is placed on the microstrip line, part of the microwave energy is coupled into the wet soil, causing energy loss. This insertion loss has a good dependence on the soil moisture content. Because its essence is to measure the dielectric constant of wet soil, the influence of soil temperature and chemical composition during the measurement can be neglected, and the amount of soil sample under test is unrestricted, and at the same time, it has sufficient sensitivity and measurement method is simple. Therefore, the microstrip The method has the advantages of certain accuracy, simplicity, speed and convenience. The method solves the main problems of measuring the water content with the microwave transmission method, and is suitable for measuring the water content of other various uniform substances and can meet the requirements of high The accuracy requirements.