一种基于总重检测的谷物干燥快速定标方法

含水量是谷物干燥品质的重要指标,在干燥过程中,在线检测谷物含水率是谷物干燥的重要步骤。采用圆筒电容式水分传感器,提出了一种快速定标方法。对三组样品进行定标的实验结果表明:当样品水分在12%-25%时,实测值与理论值的误差较小,说明该定标法具有理论分析与实际应用价值。而实测电容值存在的滞后现象,可通过提高检测样品的束缚水量和空隙率的初值精度,并在实际应用中不断校正。

Calibration Method of Capacitive Soil Moisture Sensor

Soil properties and water content vary from place to place. The calibration method based on capacitive soil moisture and humidity sensor is carried out. The sensor readings are compared with the mass water content measured by the oven dried method,and the calibration formula of sensor reading and mass moisture content is established.Results show that the sensor reading has a good linear relationship with the mass water content measured by the oven dried method,and has high precision. It can calibrate the mass moisture content of the data obtained from the moisture migration test in the soil column.