基于频域法传感器的基质含水率检测性能研究

Performance Evaluation of Substrate Moisture Detection Based on Frequency Domain Sensor

本文对基于频域法FDS-100型土壤含水率传感器在基质含水率中的检测性能进行了研究。首先,对不同配比的基质,使用FDS-100型传感器测量并将测量结果与干燥法得到的标准含水率进行对比,将FDS-100型传感器与ECH2O-5TE型基质含水率传感器在混合基质中的测量性能进行对比,并研究了压实程度、电导率和温度对传感器性能的影响。试验结果表明:FDS-100型传感器在不同配比基质中得到的测量值并不遵循同一曲线;测量值随压实程度增大而增大,测量误差在-1%~10%之间;电导率对测量值有一定影响,测量误差在±5%之间;温度对FDS-100型传感器测量值影响极小,测量误差在2%以下;FDS-100型传感器与ECH2O-5TE型传感器之间的相对误差为4.32%。FDS-100型传感器可用于基质含水率检测,但在实际使用时需要针对不同基质与不同压实程度进行标定。

Closed soilless substrate cultivation is the direction of modern agricultural transformation,substrate water content is an important detection indicator of the cultivation process,but the study of the soil moisture sensor used for detecting water content of substrate is rear.To solve this problem,this paper evaluated the performance of a frequency domain soil moisture sensor FDS-100 in the substrate water content detection comprehensively.For different proportions of the substrate,compared and analyzed the standard water content obtained from the drying method and FDS-100 measurement.Besides,it also compared the measure performance of FDS-100 and ECH2O-5 TE in a mixed substrate.The influence of compaction degree,EC value and temperature value on sensor is also tested.The results shows that measured values from FDS-100 measurement in different proportions substrate did not follow the same curve; the degree of compaction impacted the FDS-100 measurement,measured value increased with the degree of compaction,the measurement error is between-1% and 10%; EC had a certain influence on FDS-100 measurement,measurement error is between ± 5%; temperature had less effect on the measurement of FDS-100,the measurement error is below 2%; the relative error between FDS-100 and ECH2O-5 TE is 4.32%.In summary,FDS-100 can be used in substrate moisture detection,it should be calibrated for different substrates and different degrees of compaction in actual use.