基于透射光谱的玉米叶片水分含量快速检测

为实现玉米叶片水分含量快速检测,利用近红外光谱仪在300~1700 nm采用透射法对玉米叶片水分含量进行快速检测.试验利用烘干法对叶片水分梯度进行控制,并测量玉米叶片的透射光谱曲线和含水率.对透射光谱数据采用Savitzky-Golay方法进行平滑预处理,滤除光谱波动噪声干扰.分析了叶片透射光谱与含水率之间的相关关系,通过相关性分析提取敏感波长800、932、1423 nm;利用主成分分析法提取敏感波长478、748、1058和1323 nm.综合二者敏感波长最终筛选出水分敏感波长800、1323、1058和1423 nm.利用这4个波长的组合得到比值植被指数、差值植被指数和归一化植被指数等1...

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Bibliographic Details
Published in农业工程学报 Vol. 33; no. z1; pp. 137 - 142
Main Author 陈香 李民赞 孙红 杨玮 张俊逸 毛博慧
Format Journal Article
LanguageChinese
Published 中国农业大学现代精细农业系统集成研究教育部重点实验室,北京,100083%中国农业大学现代精细农业系统集成研究教育部重点实验室,北京 100083 2017
中国农业大学农业部农业信息获取技术重点实验室,北京 100083%中国农业大学农业部农业信息获取技术重点实验室,北京,100083
Subjects
光谱分析;含水率;农作物;叶片;透射法;数据处理
spectrum analysis
transmitted spectrum
leaves
农作物
含水率
data processing
透射法
光谱分析
叶片
crops
数据处理
moisture content
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.z1.021

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Summary:为实现玉米叶片水分含量快速检测,利用近红外光谱仪在300~1700 nm采用透射法对玉米叶片水分含量进行快速检测.试验利用烘干法对叶片水分梯度进行控制,并测量玉米叶片的透射光谱曲线和含水率.对透射光谱数据采用Savitzky-Golay方法进行平滑预处理,滤除光谱波动噪声干扰.分析了叶片透射光谱与含水率之间的相关关系,通过相关性分析提取敏感波长800、932、1423 nm;利用主成分分析法提取敏感波长478、748、1058和1323 nm.综合二者敏感波长最终筛选出水分敏感波长800、1323、1058和1423 nm.利用这4个波长的组合得到比值植被指数、差值植被指数和归一化植被指数等12种植被指数,选取了最优差值植被指数DVI(1423、800)与透射率T1323和T1058建立了玉米叶片含水率多元线性回归诊断模型,建模集决定系数Rc2=0.9688,验证集决定系数Rv2=0.9519,预测结果方根误差为0.061.结果表明,利用透射光谱技术检测的玉米叶片水分含量具有较高的精度,可为植物叶片水分快速检测仪器开发提供指导.
Bibliography:11-2047/S
spectrum analysis;moisture content;crops;leaves;transmitted spectrum;data processing
Water is essential for plant growth, and water shortage will have an impact on plant yield, growth and quality, therefore, rapid and nondestructive detection of water content in maize leaves is of great significance for scientific guidance of irrigation, and it is also important for improving crop yield. In order to rapidly detect the moisture content of maize leaves, transmission spectrum on the band of 300-1700 nm was selected to predict moisture content of maize leaves. The testing system included the light source and sensors. The light source part was provided by Wuling Optical Instrument Company. The transmission spectral range of 350-820 nm was obtained with ocean STS-VIS spectrometer, and the spectrum of 900-1700 nm was measured by Wuling NIRez near-infrared spectrometer. Although the 820-900 nm transmission spectrum was absent, the transmittance curves obtained from different water gradients showed the same tr
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.z1.021