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为探讨在更多波段上开展基于光偏振特性土壤湿度检测的可行性,采用自行搭建的光学系统,在可见/近红外波段上开展土壤湿度与反射光偏振特性的实验研究。研究结果表明:在600~800 nm波段,土壤湿度与反射光偏振度具有相关性,其中当14%≤土壤湿度≤30%时,反射光偏振度与土壤湿度具有良好的线性关系。对实测数据进行回归分析,结果显示线性模型平均标准差小于3%,优于参考文献[5]中近红外光谱特征方法 10%的误差结果,说明在该波段范围,采用测量光偏振态进行土壤湿度检测的方法具有可行性,为大范围土壤含水量的偏振遥感探测提供科学依据。
In order to explore the feasibility of detecting soil moisture based on light polarization in more wavebands, an optical system constructed by ourselves was used to study the polarization characteristics of soil moisture and reflected light in the visible / near-infrared range. The results show that there is a correlation between the soil moisture and the degree of polarization of the reflected light in the wavelength range of 600-800 nm. When 14% ≤ soil moisture ≤ 30%, there is a good linear relationship between the degree of polarization of the reflected light and the soil moisture. The regression analysis of the measured data shows that the average standard deviation of the linear model is less than 3%, which is better than the 10% error of the reference method [5], which shows that in this band range, The method of humidity detection is feasible and provides a scientific basis for the detection of large-scale soil moisture using polarization remote sensing.