长春光机所获得二氧化碳监测科学实验卫星载荷研制任务

据www.ciomp.ac.cn网站报道,由于温室气体排放引发的全球变暖效应已经受到世界各国的普遍关注,由此带来了对CO2等温室气体含量探测的迫切需求。针对此需求,科技部发布了"全球二氧化碳监测科学实验卫星与应用示范"     

基于OP-FTIR法监测城市交通排放CO、CO2、N2O和CH4气体

介绍了在傅里叶变换红外光谱( FTIR)技术基础上发展起来的一种监测气体的新方法——开放光程傅里叶变换红外光谱( OP-FTIR)法和基于非线性最小二乘法反演气体浓度的算法.利用OP-FTIR系统对广州交通排放CO、CO2、N2O和CH4气体进行了连续监测,并对实验结果进行了分析.实验表明:广州交通排放CO、CO2、N...     

国产卫星多角度偏振传感器的光谱特征云检测方法研究

在卫星遥感研究中, 云检测是基础环节, 其结果影响大气、地表各种参数的定量遥感, 同时也影响云微物理特性的反演。本研究针对多角度偏振卫星载荷(高分五号DPC 传感器), 建立了一种改进的光谱特征云检测算法。该算法综合利用云像元和非云像元在可见光反射率光谱、氧A 波段吸收、蓝光偏振反射率以及偏振虹等特性上的差异,分别提出了陆地、海洋上空的云检测方案, 并进一步建立了多角度云检测融合策略以标记云、晴空和未定像元。在陆地检测中, 通过增加表观压强检测和偏振虹检测分别改进了高层薄云和低层薄云的识别; 在海洋检测中, 利用表观压强与云层的退偏特性改进了耀光区云像元的识别。全球云检测结果示例显示该算法整体检测效果较好, 同时典型区域的检测结果与MODIS 云产品也具有较好的一致性。该研究可为高分五号02 星上的多角度偏振传感器云检测提供方法基础。     

大气CO2含量分布激光雷达监测

为有效地控制温室效应和气候剧变,准确可靠地监测CO2气体的变化就变得十分重要.拉曼雷达测量大气中CO2气体含量是一种技术先进的可靠方法.介绍了利用气体的拉曼散射效应来测量CO2含量分布的拉曼激光雷达,分析了拉曼雷达的基本原理,设计了具体的实验检测系统,介绍了实验系统各工作件参数情况.对拉曼雷达的回波信号的反演方法进行了具体阐述,初步取得了大气中CO2气体含量分布规律,合肥地区的二氧化碳气体含量大约在350～400 ppmv范围内波动.     

基于光电探测技术的呼吸CO2分压监测系统设计

传统用于呼吸二氧化碳(Carbon Dioxide,CO2)监测的非分光红外(Non-Dispersive Infra-Red,NDIR)白炽灯和热电堆或热释电组合探测的方法需增加滤光片以降低由光谱较宽引起的交叉敏感度,同时需进行温度补偿和控制,具有测量范围小、系统复杂度高和误差来源较多的问题.鉴于此,文中设计了基于N...     

基于双面金属包覆光波导传感器的地铁CO2气体监测系统设计

地铁有害气体的监测对乘客安全至关重要,为了提高地铁中CO2 气体含量检测的灵敏度,提出以双面金属包覆光波导结构为载体设计新型的CO2 气体传感器作为检测终端。通过对导模的计算分析,结果表明传感器具有极高的灵敏度。采用ZigBee 无线通信技术设计地铁CO2 气体监测系统,给出了设计方案,为地铁有害气体监测系统的工程实践提供的可供选择的方案。     

10.6 μm CO2激光对非制冷红外热像仪饱和阈值的实验研究

用适当波长的激光器,对红外成像系统进行干扰,是光电对抗领域的一个研究热点。本文采用波长为10.6 μm的CO₂脉冲激光器,通过漫反射板反射激光能量到320×240多晶硅非制冷焦平面红外热像仪,进行激光干扰红外成像系统的实验。通过实验,得到了红外热像仪的饱和辐照阈值,并通过理论分析,推导出在一定距离上,使红外热像仪发生饱和干扰情况所需的激光能量值。     

气动CO2激光器小信号增益的实验研究

用放大法测量了分别在甲苯和乙醇两种液体燃烧驱动下气动CO2激光器的小信号增益系数。实验发现,用甲苯作为燃料时激光器的平均小信号增益系数可达0.62m-1,远远高于乙醇作燃料时的小信号增益系数。结合甲苯和乙醇分别与空气燃烧后产物组分的配比,对实验结果进行了分析,得出甲苯是燃烧驱动气动CO2激光器的一种比较理想的燃料。     

A two electrode C-NiO Nafion amperometric sensor for NO2 detection

In this paper, the authors propose a new and simple Nafion-based NO₂ amperometric sensor, a dedicated measurement system, and a measurement protocol. The system has a linear response to NO₂ concentration, and a sensitivity up to 90 nA/ppm. Moreover, the developed sensor shows a satisfactory repeatability and a low cross-sensitivity to common interfering gases such as CO and oxygen.     

Polypyrrole, α-Fe2O3 and their hybrid nanocomposite sensor: An impedance spectroscopy study

Polypyrrole (PPy), α-Fe₂O₃ and their hybrid nanocomposites have been successfully prepared using chemical polymerization, sol–gel and solid state synthesis method respectively. Films of PPy, α-Fe₂O₃ and PPy/α-Fe₂O₃ nanocomposites were deposited on glass substrates using spin coating technique and characterized using FTIR, XPS, FESEM, TEM techniques as well as their gas sensing performance were studied towards NO₂ gas. FTIR and XPS study confirms the formation of PPy, α-Fe₂O₃ and PPy/α-Fe₂O₃ hybrid nanocomposites. FESEM studies revealed that, the films consists of porous granular type of morphology. TEM analysis revealed that the hybrid composite is in nano range. Impedance spectroscopy studies in presence of air and after exposure of NO₂ gas were carried out on PPy, α-Fe₂O₃ and PPy/α-Fe₂O₃ hybrid nanocomposite films in the frequency range of 20 Hz–10 MHz. Impedance spectroscopy results demonstrate that, the impedance is mainly contributed by the potential barrier at grain boundaries of the films. With the help of impedance spectroscopy results, sensing mechanism between PPy, α-Fe₂O₃ and PPy/α-Fe₂O₃ hybrid nanocomposite films and NO₂ gas molecules was studied and explored.     

石墨烯掺杂Cs2CO3作为高效电子注入层的OLEDs性能研究

研制了石墨烯掺杂Cs₂CO₃(Cs₂CO₃:Graphe ne )作为高效电子注入层、结构为ITO/N,N′-bis-(1-naphthyl) -N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB)(50 nm)/tris-(8-hydroxy quinoline)-aluminum Alq₃(80 nm)/Cs₂CO₃:Gra phene (mss 20% 1nm)/Al(120 nm)的OLEDs。将其与标准器件ITO/NPB(50 nm)/Alq₃(80 n m)/LiF(0.5 nm)/Al(120 nm)作性能比较,研究石墨烯掺杂在Cs₂CO₃中作为电子注入层 对 OLEDs性能的影响。结果表明,基于Cs₂CO₃:Graphene结构作为电子注入层的器 件效率要高于LiF作为电子注入层的器件,其最大电流效率达到2.02 cd/A, 是标准器件的2.59倍;亮度也高于LiF作为电子注入层的器件,在10 V时达 到最大值7690cd/m²,是标准器件最大亮度 的2.07倍。性能得到提高的主要机理是由于Cs₂CO₃:Graphene的引入提高了电子注入效率。     

Removal of HF/CO2 post-etch residues from pattern wafers using water-in-carbon dioxide microemulsions

We have investigated different methods for removing the HF/CO₂ post-etch residues from blanket and patterned wafers of borophosphosilicate glass. The use of co-solvents, rinsing the residues with DI water followed by CO₂-based drying process, and the use of water-in-CO₂ (W/C) microemulsions were explored as possible methods to remove the etch residues. It was found that the addition of co-solvents were ineffective for quantitative removal of residues, whereas rinsing the etch residues with DI water followed by the surfactant-aided scCO₂ drying was found to be effective. To eliminate the pure water rinsing step, W/C microemulsions formed with different surfactants were directly treated with residues. While ionic surfactants such as ammonium carboxylate perfluoropolyether and sodium salt of bis (1H,1H,2H,2H-tridecafluoro-octyl)-2-sulfosuccinate did not produce stable microemulsions in the presence of HF, due to protonation effect, the reverse micelles formed with an amphiphilic block copolymeric surfactant, poly(ethylene oxide-b-perfluorooctylmethacrylate), was found to be highly efficient as clean and residue-free images were observed by microscopic analysis.     

SF6分解气体在线红外光谱检测系统设计

SF6气体在放电或过热时会发生电离和分解,产生多种气体分解物。这些分解物会影响电气设备的绝缘性能。但现有的红外气体检测手段均无法对SF6分解气体进行现场在线测量。根据实际需求,本文根据光栅分光的原理设计了一种红外光谱检测系统。该系统可对SF6分解气体的成分和含量进行实时测量,可在电气设备带电运行的状态下进行在线测量。测量数据为分析设备的性能和安全状况提供有力的依据。     

Faraday rotation,optical isolation and modulation at 10.6 μm using hot-pressed CdCr2S4 and CoCr2S4

Measurements performed on hot-pressed samples of ferromagnetic CdCr₂S₄ and ferrimagnetic CoCr₂S₄ indicate that they would be useful as optical isolators and modulators for CO₂ lasers at 10.6 μm. Based on the Faraday effect, large aperture devices could be fabricated which would operate under modest cooling and drive power requirements. The various figures of merit needed to evaluate the performance of these materials as isolators and modulators have been determined optically with a low power CO₂ laser. D.C. applied magnetic fields were used to determine the variations in measured Faraday rotation as a function of sample thickness. Figures of merit pertinent to isolation were also obtained, such as the passive extinction ratio and forward to backward transmitted energy ratio. A.C. applied magnetic fields were used to determine the frequency response of the materials, their modulation depths, and drive powers up to 100 kHz. Short duration pulses were used to analyze higher frequency behavior.     

CO2激光器混沌运转的实验方法

从MB方程出发,简单分析了CO2激光器的动力学过程。从实验角度对实现CO2激光器混沌运转的各种方法作了概述,并结合多电极对CO2激光器提出了可行的实现混沌的方法。     

基于CO2激光的AgGaS2差频产生太赫兹波的数值分析

采用中红外CO₂激光差频产生太赫兹波是提高转换效率和输出功率的一种有效方法。根据差频过程中的三波互作用对AgGaS₂晶体进行了理论分析,数值模拟了oeo类和oee类两种匹配条件下差频产生太赫兹波的角度调谐曲线,并计算了光波在晶体中的走离角和允许参量。另外,还考虑了晶体的有效非线性系数和理论功率转换效率。研究结果表明,AgGaS₂晶体适用于中红外CO₂激光差频产生可广泛调谐的太赫兹波。