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雾滴在叶面上蒸发时间长短,会改变叶面对农药的吸收效率。为了阐述药液在叶面的蒸发情况,该文设计了基于驻波与Zig Bee无线传输的雾滴蒸发实时监测装置。该装置以STM32为核心搭建Zig Bee网络,雾滴采集传感器信号由RS232串口传至基于Lab View2014设计的远程终端,并通过波形图实时在线监测雾滴蒸发状况。试验证明该装置能够准确测量药液在叶面的蒸发散失量并显示雾滴面积铺展的波动曲线,较图像处理方法误差小,易操作,更具实用性。试验还表明:1)蒸发时间与粒径大小呈正相关,随粒径增大而增长,但当粒径超过242.3μm时,蒸发时间随粒径增大而增长的趋势更为明显。2)蒸发时间与面积铺展率呈负相关,随面积铺展率的变大而减少。当有机硅体积分数由0.025%增到0.050%时,雾滴面积铺展率呈变大趋势,但当由0.050%增到0.100%时,雾滴铺展率增长幅度相对缩小。3)该装置不仅能够实现远程检测,避免接触药液,而且实时分析雾滴在叶面的蒸发时间与面积铺展率,合理选择有机硅体积分数与雾滴粒径,有助于改善叶面对药液的吸收效率。
Evaporation of the droplets on the leaves for the length of time, will change the efficiency of leaf absorption of pesticides. In order to elucidate the evaporation of liquid on the foliage, a real-time monitoring device of droplet evaporation based on standing wave and Zig Bee wireless transmission was designed. The device builds the Zig Bee network with STM32 as the core. The signal from the droplet acquisition sensor is transmitted from the RS232 serial port to the remote terminal based on Lab View2014. The droplet evaporation status is monitored online by the waveform chart. The test proves that the device can accurately measure the evaporation loss of the liquid on the leaf surface and display the fluctuation curve of the droplet area spreading. Compared with the image processing method, the device has the advantages of small error, easy operation and more practicality. The experiment also showed that: 1) Evaporation time was positively correlated with particle size, which increased with the increase of particle size. However, when particle size exceeded 242.3μm, the evaporation time increased with the increase of particle size. 2) The evaporation time is negatively correlated with the area spreading rate, but decreases with the area spreading rate. When the volume fraction of silicone increased from 0.025% to 0.050%, the spread of droplet area tended to increase. However, when the volume fraction of silicone increased from 0.050% to 0.100%, the droplet growth rate of droplet was relatively reduced. 3) The device can not only achieve remote detection, to avoid contact with liquid chemicals, and real-time analysis of the droplet evaporation time in the leaf surface and area spreading rate, a reasonable choice of silicone volume fraction and droplet size, help to improve the leaf surface Liquid absorption efficiency.