基于变介电常数的植物叶片含水率无损检测装置设计
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摘要
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 AT89 C51 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.
Taking the single chip mcirocomputer AT89 C51 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.
引文
[1]李晋阳,毛罕平.基于阻抗和电容的番茄叶片含水率实时监测[J].农业机械学报,2016,47(5):295-299
[2]孙俊,张国坤,毛罕平,等.基于介电特性与回归算法的玉米叶片含水率无损检测[J].农业机械学报,2016,47(4):257-264
[3]陈香,李民赞,孙红,等.基于透射光谱的玉米叶片水分含量快速检测[J].农业工程学报,2017,33(s1):137-142
[4]黄亮.基于AT89C51单片机的串口通信程序的设计[J].电子制作,2006(7):29-32
[5]赵艳华,龚丽农.基于超声波测量的视力保护仪设计[J].青岛农业大学学报(自然科学版),2015,32(4):297-301
[6]孙俊,张国坤,毛罕平,等.基于介电特性与回归算法的玉米叶片含水率无损检测[J].农业机械学报,2016,47(4):257-264
[7]ABOUELWAFA M S A,KENDALL E J M.Determination of the theoretical capacitance of a concave capacitance sensor[J].Review of Scientific Instruments,1979,50(9):1158
[8]钟海丽.555定时器在控制电路中的应用[J].电力科学与技术学报,2003,18(2):61-63
[9]黎琼,温泉彻,方大良.数据采集系统中通用信号调理电路的分析[J].岭南师范学院学报,2006,27(3):135-138
[10]孔令荣.基于AT89C51单片机的量程自切换频率计[J].电子设计工程,2012,20(22):168-170
[11]任小青,王晓娟.基于AT89C5单片机的频率计设计方法的研究[J].青海大学学报,2009,27(2):10-12
[12]SAWAI Y,YAMAGUCHI Y,MIZUKAMI Y.Moisture Content Measurement of Tea Leaves by Electrical Impedance and Capacitance[J].Biosystems Engineering,2006,93(3):293-299
[13]徐腾飞,韩文霆,孙瑜.基于图像处理的玉米叶片含水率诊断方法研究[J].干旱地区农业研究,2013,31(1):95-100
[14]郭文川,刘东雪,周超超,等.基于电容特性的植物叶片含水率无损检测仪[J].农业机械学报,2014,45(10):288-293
[15]史增芳,姜岩蕾.一种便携式玉米叶片含水检测仪器设计[J].农机化研究,2016,38(8):96-100
[16]李晋阳,毛罕平.基于阻抗和电容的番茄叶片含水率实时监测[J].农业机械学报,2016,47(5):295-299
[17]刘志壮,吕贵勇.基于电容法的稻谷含水率检测[J].农业机械学报,2013,44(7):179-182
[2]孙俊,张国坤,毛罕平,等.基于介电特性与回归算法的玉米叶片含水率无损检测[J].农业机械学报,2016,47(4):257-264
[3]陈香,李民赞,孙红,等.基于透射光谱的玉米叶片水分含量快速检测[J].农业工程学报,2017,33(s1):137-142
[4]黄亮.基于AT89C51单片机的串口通信程序的设计[J].电子制作,2006(7):29-32
[5]赵艳华,龚丽农.基于超声波测量的视力保护仪设计[J].青岛农业大学学报(自然科学版),2015,32(4):297-301
[6]孙俊,张国坤,毛罕平,等.基于介电特性与回归算法的玉米叶片含水率无损检测[J].农业机械学报,2016,47(4):257-264
[7]ABOUELWAFA M S A,KENDALL E J M.Determination of the theoretical capacitance of a concave capacitance sensor[J].Review of Scientific Instruments,1979,50(9):1158
[8]钟海丽.555定时器在控制电路中的应用[J].电力科学与技术学报,2003,18(2):61-63
[9]黎琼,温泉彻,方大良.数据采集系统中通用信号调理电路的分析[J].岭南师范学院学报,2006,27(3):135-138
[10]孔令荣.基于AT89C51单片机的量程自切换频率计[J].电子设计工程,2012,20(22):168-170
[11]任小青,王晓娟.基于AT89C5单片机的频率计设计方法的研究[J].青海大学学报,2009,27(2):10-12
[12]SAWAI Y,YAMAGUCHI Y,MIZUKAMI Y.Moisture Content Measurement of Tea Leaves by Electrical Impedance and Capacitance[J].Biosystems Engineering,2006,93(3):293-299
[13]徐腾飞,韩文霆,孙瑜.基于图像处理的玉米叶片含水率诊断方法研究[J].干旱地区农业研究,2013,31(1):95-100
[14]郭文川,刘东雪,周超超,等.基于电容特性的植物叶片含水率无损检测仪[J].农业机械学报,2014,45(10):288-293
[15]史增芳,姜岩蕾.一种便携式玉米叶片含水检测仪器设计[J].农机化研究,2016,38(8):96-100
[16]李晋阳,毛罕平.基于阻抗和电容的番茄叶片含水率实时监测[J].农业机械学报,2016,47(5):295-299
[17]刘志壮,吕贵勇.基于电容法的稻谷含水率检测[J].农业机械学报,2013,44(7):179-182