论文部分内容阅读
针对土壤压实度检测的需求,本研究应用CFBLS-100型拉压传感器和基于PCMCIA总线的DAQP-12数据采集卡,在LabVIEW环境下设计了一套土壤压实度现场测试系统。该系统能够实时显示传感器输出电压及所对应的压力变化曲线,并将所采集到的数据存储到计算机中,完成对数据的分析。经标定试验证明:该测试系统所拟合的方程为线性,其相关系数较高,线性度较好,灵敏度较高,系统精度等级小于1级,工作时系统稳定可靠。由室内试验知,在不同水平分层处,土壤压实度与不同模拟压力间均表现出3次多项式的函数关系,显著性较强(α<0.05)。且在不同模拟压力下,不同土壤水平分层处的土壤压实度和土壤容重表现出相似的特性,随着模拟压力的增加和土壤分层逐步加深,土壤压实度和土壤容重的增加趋势趋于一致。为研究作物地下组织与土壤之间的根土系统及合理耕层的构建提供理论基础,并为农业机械的研发具有一定的意义。
In order to meet the needs of soil compaction testing, this study designed a set of soil compaction field test system in LabVIEW environment using CFBLS-100 tension sensor and DAQP-12 data acquisition card based on PCMCIA bus. The system can display real-time sensor output voltage and the corresponding pressure curve, and the collected data is stored in the computer to complete the analysis of the data. The calibration test shows that the equation fitted by the test system is linear, the correlation coefficient is high, the linearity is good, the sensitivity is high, the system accuracy is less than level 1, and the system is stable and reliable when working. Laboratory tests show that at different levels of stratification, the soil compaction and the simulated pressure show a third-order polynomial function, which is significantly (α <0.05). Under different simulated pressures, soil compaction and soil bulk density at different soil layers show similar characteristics. With the increase of simulated pressure and the gradual deepening of soil layers, soil compaction and soil bulk density increase Be consistent. It provides a theoretical basis for the study of the root system and the construction of reasonable topsoil between the underground tissues of crop and soil, and has certain significance for the research and development of agricultural machinery.