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通过对绿色植被近红外区反射光谱的系统分析,充分证明O-H决定植被在1450nm和1940nm附近的光谱特征,在此基础上,设计并制备了4种层间含O-H的新型光谱模拟材料Mg-Al-X-LDH(X为NO_3-、Cl-、CO_3~(2-)、SO_4~(2-)),并对其进行了X射线衍射、红外光谱、热重分析及拉曼光谱表征。依据光谱相关系数和光谱角度匹配模型计算,4种层状双金属氢氧化物(LDH)与植物叶片近红外反射光谱两种计算模型的相似度分别超过0.9600和0.9700;以Mg-Al-Cl-LDH为模拟材料,初步与聚氨酯复合,制备了与植被在近红外区光谱高度相似的涂层,两种计算模型的相似度分别达到0.9702和0.9924;Mg-Al-Cl-LDH在紫外可见光区的高度透明性,有利于各个波段光谱材料的复合;经180℃高温处理前后的Mg-Al-Cl-LDH,两种计算模型的相似度依然能达到0.9888和0.9959,说明Mg-Al-LDH有良好的热稳定性,不易失水。
Based on the systematic analysis of the near-infrared reflectance spectra of green vegetation, it is fully proved that OH determines the spectral characteristics of the vegetation near 1450nm and 1940nm. On the basis of this, we designed and prepared four kinds of novel optical spectral simulation materials Mg-Al -X-LDH (X is NO_3-, Cl-, CO_3 ~ (2-), SO_4 ~ (2-)) were synthesized and characterized by X-ray diffraction, FTIR, TG and Raman spectroscopy. Based on the spectral correlation coefficient and spectral angle matching model, the similarity between the four layered double metal hydroxides (LDHs) and plant leaf NIR reflectance spectra exceed 0.9600 and 0.9700, respectively. The Mg-Al-Cl- LDH as a simulated material, and preliminary with the polyurethane composite prepared with the vegetation in the near-infrared spectral similarities of the coating, the similarity between the two models reached 0.9702 and 0.9924; Mg-Al-Cl-LDH in the UV-visible region The results show that Mg-Al-LDH has a good transparency and high transparency, which is conducive to the composite of spectral materials in all the bands. The similarity between the two models can still reach 0.9888 and 0.9959 after Mg-Al-Cl-LDH treatment at 180 ℃, The thermal stability, easy to lose water.