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MICROWAVE SOIL MOISTURE SENSOR BASED ON PHASE SHIFT METHOD AND INDEPENDENT OF ELECTRICAL CONDUCTIVITY OF THE SOIL
MICROWAVE SOIL MOISTURE SENSOR BASED ON PHASE SHIFT METHOD AND INDEPENDENT OF ELECTRICAL CONDUCTIVITY OF THE SOIL
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机译：基于相移法和土壤电导率独立性的微波土壤水分传感器
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摘要
The present invention relates to soil moisture measurement by microwave sensor composed of sensor element (1), porous matrix (2), phase shift measurement circuit (3) and circuit protective layer (4). Operating principle is based on phase shift method using the fact that phase shift of the signal propagating along sensor element is related to porous matrix moisture content. Matrix is in contact with surrounding soil and is in hydrodynamic balance with it, therefore it copies surrounding soil water content. Phase shift measurement circuit initiates sensor element and measures achieved phase shift. The sensor is independent of soil's electrical conductivity thanks to microwave operating frequency (Ghz). In this way it is less sensitivity on soil type and therefore less demanding for calibration. Sensor is made of durable elements without consumable parts which enables long term operation. Its low power consumption makes it suitable for wireless sensor networks and automatic irrigation systems.
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