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针对农田环境下观测作物生长所需土壤水分变化的实际需要,研制了一种基于TDR原理的新型土壤水分传感器。运用等效采样原理和窄脉冲激励来构建高速波形重建方法,同时设计开发PC上位机软件,通过蓝牙技术将TDR测量设备与上位机软件进行通信,测量结果可实时无线传输。为验证其性能,进行了4种不同质地土壤的标定试验,并与波兰Easy Test公司的FOM/mts型TDR进行对比。试验结果表明:该传感器在土壤含水量非饱和状态下,测量结果与土壤实际含水量线性相关度达到0.97以上,且几乎不受土壤质地影响,具有一定的推广应用价值。
Aiming at the actual need of observing the change of soil moisture in cropland under cropland environment, a new type of soil moisture sensor based on TDR principle was developed. The equivalent sampling principle and narrow pulse excitation are used to build high-speed waveform reconstruction method. At the same time, the PC software of PC is designed and developed. The TDR measurement equipment and PC software are communicated by Bluetooth technology. The measurement results can be wirelessly transmitted in real time. In order to verify its performance, four different soil textures were calibrated and compared with the Easy Test FOM / mts TDR from Poland. The experimental results show that the linear correlation between the measured result and the actual water content of soil reaches above 0.97 under the unsaturated condition of soil moisture, which is hardly affected by the soil texture and has certain popularization and application value.