基于变介电常数的植物叶片含水率无损检测装置设计

以AT89C51单片机为核心,结合数字电子技术相关电路,设计了一款基于变介电常数的植物叶片含水率无损检测装置。该装置采用夹持型平行极板电容器与555定时器搭建多谐振荡器,以待测叶片作为电容极间介质,通过待测叶片水分变化影响介电常数,进而改变多谐振荡器频率,再由单片机完成数据读取与处理,以此来检测叶片含水率。并采用鸢尾、望春玉兰、紫荆和海州常山四种植物叶片进行测量试验,试验结果表明,该装置可以实现植物叶片含水率无损检测,具有一定的应用价值。

Taking the single chip mcirocomputer AT89C51 as the core and combining digital electronic technology related circuits, a non-destructive detection device for water content of plant leaves based on variable dielectric constant was designed.The clamped parallel plate capacitor and 555 timer were used to construct a multivibrator, and the leaf measured was used as the capacitor-electrode medium.The dielectric constant was affected by the water content change of the leaf, which resulted in the changing frequency of the multivibrator.Then the data were read and processed by the single chip mcirocomputer to detect the water content of the leaf.The leaves of four plant species, Iris, Magnolia biondii, Cercis chinensis, and Clerodendrum trichotomum were measured.The experimental results showed that the device could realize the non-destructive detection of water content of plant leaves and had a certain application value.

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