摘要
利用便携式傅里叶变换红外光谱仪研究野外测量水稻冠层热红外发射率的方法.结果表明:由于下行辐射成分的影响,室内测量得到的发射率值一般接近1.0,且发射率光谱曲线中的目标光谱特征不明显,因此,进行植物野外发射率测量时必须选择无风、无积云的天气,同时缩短仪器与植物的测量距离,使植物叶片充满视场;普朗克温度拟合法对于植物不是一个适合的温度/发射率分离模型,利用光谱平滑迭代法可以获取较准确的发射率值.
The procedure and method of emissivity field measurement for rice were conducted using a portable Fourier transform infrared spectrometer. The results showed that rice emissivity value measured indoor was very close to 1. 0, and no distinct emissivity characteristics were found in the spectral curves. Consequently, the field measurement should be carried out under generally clear sky conditions and low to moderate relative humidity, and the distance between the instrument and the objective should be shortened in order to make leaves fully within the instrument field of view. Moreover, in terms of the processing methods, the iterative spectrally smooth algorithm instead of the Planck function was the suitable method to remove atmospheric features and extract the surface spectral emissivity of plants.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2010年第2期175-180,共6页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金资助项目(30571112)
作者简介
林芬芳（1980-），女，福建三明人，硕士研究生，主要从事遥感应用研究．E-mail：florence@zju．edu．cn．
通信作者：王珂，男，教授，博士生导师，主要从事农业遥感与信息技术方面的研究．Tel：0571—86971992；E—mail：kwang@zju．edu．cn．
