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当前位置: 首页 > 文章 > 厚度补偿式叶绿素仪的设计 农机化研究 2013 (7) 119-123
Position: Home > Articles > Design of Leaf Thickness Compensated Chlorophyll Meter Journal of Agricultural Mechanization Research 2013 (7) 119-123

厚度补偿式叶绿素仪的设计

作  者：
郭冲冲;李东升;方波;陈爱军;李加福
单  位：
中国计量学院计量测试工程学院
关键词：
叶绿素;叶绿素仪;叶片厚度;补偿
摘  要：
为精确诊断植物叶绿素含量,在一定程度上消除叶片厚度差异对叶绿素测量的影响,利用叶绿素在可见—近红外波段的光谱特性,引入叶片厚度参量建立叶绿素测量数学模型,开发了厚度补偿式叶绿素仪。该仪器包括叶片夹具装置、光源系统、光源驱动模块、接收检测模块、叶厚测量模块、单片机外围系统及软件系统;设计的光源系统采用一些简单光学元件,使两者波长能汇聚于同一处,简化了光学结构;设计了集叶绿素测量和厚度测量于一体的叶片夹具装置,以保证厚度测量点和叶绿素测量点为同一点;提出了运放反馈型恒流光源驱动电路方案,并测试了其输出电流以及光电检测器接收到的光强电压值变化,得到输出电流不变,光强电压值的标准差为1.15mV,使其稳流精度高,发光稳定;标定测量叶片厚度值的电感传感器,得到其传感器的线性度小于1%,回程误差3μm,分辨力为1μm,灵敏度为0.006 V/μm,传感器性能良好。
译  名：
Design of Leaf Thickness Compensated Chlorophyll Meter
作  者：
Guo Chongchong,Li Dongsheng,Fang Bo,Chen Aijun,Li Jiafu(College of Metrology & Measurement Engineering,China Jiliang University,Hangzhou 310018,China)
关键词：
chlorophyll;chlorophyll meter;leaf thickness;compensation
摘  要：
In order to accurate diagnosis the plant chlorophyll content,and eliminate the influence of leaf thickness differences on the chlorophyll measurement in a certain extent,according to the visible-near infrared spectral characteristics of the chlorophyll,the mathematical model of chlorophyll meter was established after introducing the leaf thickness parameter,and the leaf thickness compensated chlorophyll meter was designed.The instrument consisted of leaf fixture device,light source system,light source driving,receiving detection module,leaf thickness measurement,modules single-chip peripheral systems and software system;The simple optical components were used in the light source system,so that the two wavelengths can together in the same place,which simplified the structure of the light path;and the leaf fixture device with chlorophyll measurement and thickness measurement in one,ensure the two measurement points for the same;the light source driving which belonged to Op-amp feedback constant-current source was proposed,and tested the current output change,the standard deviation of the light intensity voltage value was 1.15mv,got the high steady flow precision;then the sensor was calibrated,got the sensor linearity was less than 1%,the return error was 3μm,the resolution is1 μm,the sensitivity is 0.006 V/μm.We innovative introduce the leaf thickness compensation module to the chlorophyll meter,and the instrument can store data and interact with the host computer,low power consumption,easy operation,would realize the accurate measurement of plant nutrients and physical traits.

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