基于LVDT的植株茎直径微变化监测系统的设计与实现

摘要

水资源紧缺日趋严重的现状迫切要求农业灌溉朝着精确灌溉的方向发展,这就需要合理的灌溉指标指导灌溉;通过茎秆直径随作物水分的变化来反映作物水分状况具有不破坏植株组织、适合长期自动监测的优点;因此,茎直径变化便成为指导灌溉的有效指标,对茎秆直径变化的监测也随之成为当前相关研究的重点;文章所设计的监测系统主要由Pc机、单片机、模/数转换芯片TLC2543、LVDT信号调理芯片AD698和LVDT传感器组成,可实现对茎秆直径变化的精确、实时监测,具有精度高、成本低等优点.%At present, the water resources become more and more urgent, and the precise irrigation also become the direction of irrigation. Reflecting the crops moisture content condition by the changes of stem diameter has lots of merits. There{ore, the changes of stem diameter become the effective irrigation indicator, and monitoring the changes of stem diameter also becomes the emphasis of current research.The monitoring system designed by this article is composed of PC. MCU. A/D transformation chip TLC2543. Signal conditioning circuit AD698 for Linear Variable Differential Transformer (LVDT) and LVDT sensor, it could carry out precise and real-time monitoring of the changes of stem diameter, and the system has the merits of high precision and low cost.