本文選題：Vis-NIR　切入點(diǎn)：反射光譜　出處：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：設(shè)計(jì)與綠色植被可見-近紅外(Vis-NIR)反射光譜相似的模擬材料,以對(duì)抗高光譜遙感探測(cè)技術(shù),能夠提高武器的作戰(zhàn)能力和隱蔽性。現(xiàn)階段的模擬材料在近紅外光區(qū)存在一定的缺點(diǎn),為此,本文詳細(xì)地分析了綠色健康植被在可見-近紅外光區(qū)的漫反射光譜,分析論證了各個(gè)波段特征光譜的產(chǎn)生機(jī)理,以此為理論依據(jù),從而設(shè)計(jì)各個(gè)波段的光譜模擬材料,將各個(gè)波段的模擬材料進(jìn)行復(fù)合,得到與綠色植被在Vis-NIR光區(qū)同色同譜的模擬材料,最后以復(fù)合模擬材料為填料制備聚氨酯涂層,并分析涂層的光譜特性。主要的研究成果如下:1、通過(guò)對(duì)綠色健康植被進(jìn)行可見-近紅外漫反射光譜測(cè)試,得出葉綠素、葉片內(nèi)部結(jié)構(gòu)、水是綠色植被反射光譜的決定因素,以此為依據(jù)設(shè)計(jì)的各個(gè)波段模擬材料為:鉻綠、卟啉、層狀雙金屬氫氧化物(LDHs);2、探究了綠色植被紅邊產(chǎn)生機(jī)理,紅邊的產(chǎn)生不僅限于葉綠素,而是卟啉類化合物特有的光譜特征,紅邊產(chǎn)生的根本原因是卟啉環(huán)a2u(π)-eg(π*)躍遷產(chǎn)生的Q帶所致,并初步歸納了紅邊位置的影響因素;3、通過(guò)單因素控制變量法分析了實(shí)驗(yàn)參數(shù)對(duì)Mg-Al-LDHs近紅外反射光譜的影響,確定了最佳實(shí)驗(yàn)參數(shù),借助于XRD、IR、TG、Raman等表征手段,得出Mg-Al-Cl-LDHs與綠色植被的反射光譜在近紅外光區(qū)高度相似、且具有良好的熱穩(wěn)定性、不易失水和在紫外-可見光區(qū)高透明性等優(yōu)點(diǎn);并考察了含有不同金屬、層間陰離子的一系列LDHs的近紅外光譜,其中,過(guò)渡金屬參與的LDHs在紫外-可見光區(qū)(UV-Vis)有獨(dú)特的吸收峰,歸因于類水鎂石層過(guò)渡金屬離子的d-d躍遷。4、以鉻綠、樹葉粉、LDHs為光譜模擬材料進(jìn)行復(fù)合,與綠色植被在Vis-NIR光區(qū)進(jìn)行反射光譜相似度比較,確定最佳配比的復(fù)合材料,以此復(fù)合材料為填料,并添加適量的反射率調(diào)節(jié)劑,制備了與綠色植被反射光譜高度相似的聚氨酯涂層,并做相似度計(jì)算。
[Abstract]:A simulation material similar to the visible-near infrared (NIR) reflectance spectrum of green vegetation is designed to counter the hyperspectral remote sensing detection technology which can improve the combat capability and concealment of the weapon.In this paper, the diffuse reflectance spectra of green and healthy vegetation in the visible and near infrared region are analyzed in detail, and the mechanism of characteristic spectra in each band is analyzed.Based on this theory, the spectral simulation material of each band is designed, and the simulation material of each band is recombined to obtain the same color and same spectrum material as green vegetation in the Vis-NIR light region.Finally, polyurethane coating was prepared with composite simulation material as filler, and the spectral characteristics of the coating were analyzed.The main research results are as follows: 1. Through the visible-near infrared diffuse reflectance spectroscopy test of green and healthy vegetation, it is concluded that chlorophyll, leaf internal structure and water are the decisive factors of green vegetation reflectance spectrum.The root cause of red edge is the Q band produced by the transition of porphyrin ring a2u (蟺 -egu), and the influence factor of red edge position is summarized preliminarily. The influence of experimental parameters on the near-infrared reflectance spectrum of Mg-Al-LDHs is analyzed by single factor control variable method.The optimum experimental parameters were determined. By means of the characterization of Mg-Al-Cl-LDHs and green vegetation, it was found that the reflectance spectra of Mg-Al-Cl-LDHs and green vegetation were highly similar in the near infrared region, and had the advantages of good thermal stability, low water loss and high transparency in the UV-visible region.The near infrared spectra of a series of LDHs containing different metals and interlaminar anions were investigated. Among them, LDHs with transition metal participation had a unique absorption peak in the UV-Vis-visible region.The d-d transition. 4, attributed to the transition metal ions in brucite-like layer, was composed of chromium-green and leaf powder LDHs as the spectral simulation materials, and compared with the green vegetation in the Vis-NIR light region to determine the optimum ratio of composite materials.The polyurethane coating which is similar to the green vegetation reflectance spectrum was prepared and the similarity was calculated by using the composite material as filler and adding appropriate reflectance regulator.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB34;O657.33

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