Research On The Near-infrared Reflectance Specta And Emissivity Of LDHs Simulating Green Vegetation

In order to protect the military equipment and achieve the initiative of the war,the compatible stealth material of the visible,near infrared and far infrared was designed to avoid the detection of hyperspectral remote sensing technology,which is of great significance to obtain the victory of the war.Previous camouflage materials could satisfy the requirement of camouflage stealth in a single band.Therefore,the reflection spectrum of green vegetation in visible near-infrared region and the emissivity of far-infrared region were analyzed in detail.In this paper,it analyzed that reflection spectrum of green vegetation in the near-infrared region and the emissivity of the far infrared region in detail,and analyzed the factor that affect the emissivity of the leaf.According to the theoretical basis,the simulation material was designed.The obtained research results were listed as follows:1.Based on the detection of the emissivity of green leaves in far-infrared region,we find out that water and leaf blade skeleton are the key factor which influence the emissivity of green leaves.Chlorophyll and leaf thickness have no effect on emissivity.According to the theoretical basis,the simulation material was LDHs.2.According to the reflection spectrum of the green vegetation,we designed the simulation material which simulate the reflectance spectra of leaves in the 400~2500nm.After many experiments,the Zn/Cr-LDHs was selected as the simulation material.The effects of the experiment parameters on the Zn/Cr-LDHs reflectance spectra were determined by the one-factor control variable method,and the optimal synthesis conditions were confirmed.According to a series of physical characteristics,Zn/Cr-LDHs was highly similar to the reflection spectra of green vegetation,and it had good thermal stability and was hard to lose water.3.Preparation of Mg/Al-LDHs films by hydrothermal method.The reflectance spectra and emissivity of Mg/Al-LDHs films under different reaction temperatures and different reaction time were studied.The experimental results show that the reflection spectra of Mg/Al-LDHs films have a certain similarity with the reflectance spectra of the green vegetation.And the longer the reaction time,the higher the emissivity of the Mg/Al-LDHs film.