中文摘要：

为解决当前作物氮素分析成本较高、分析过程复杂、分析时间长等问题,设计了一款基于光谱学原理的四波段作物冠层分析仪,通过快速检测作物冠层植被指数预测作物长势。分析仪主要由控制单元和测量单元组成。控制单元只含一个控制器,该控制器作为整个无线传感网络的协调器,负责将各个传感器节点发送的数据进行分类、显示以及存储等,并根据测量结果计算作物营养成分含量。测量单元则由多个光学传感器组成,主要负责光学信号的采集、放大、发送等。每个传感器可以在4个光学波段进行测量,分别是绿色植物可见光主要反射峰550 nm,可见光主要吸收波段650 nm,近红外波段7668、50 nm。标定试验显示光学传感器工作稳定,仪器具有较高的精度。初步玉米田间试验表明,仪器的测量结果与玉米叶片全氮含量的相关系数达到0.884。

英文摘要：

In order to solve the problems encountered in analyzing crop nitrogen concentration by chemical methods,such as high cost,long and complicated process,etc.,a new four-waveband crop canopy analyzer was developed based on optical principle to obtain some vegetation indices to evaluate the crop growth status.The analyzer was designed to work as a wireless sensor network with a control unit and a measuring unit.As the coordinator of the whole wireless network,the controller was used to receive,display and store all the data sent from different sensor nodes.The measuring unit which consisted of several optical sensors was designed to collect,amplify and transmit the optical signals.Each sensor node contained four optical channels,which allowed the instrument work at the wavebands of 550nm,650nm,766nm and 850nm.Calibration test was conducted and the result showed a good performance.An experiment in maize field was also performed,and the correlation between measured N and predicted N in crop leaves had high significance with R of 0.884.Those results showed the potential of the instrument in crop nutrition level diagnosis.