共查询到19条相似文献,搜索用时 203 毫秒
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热红外伪装遮障材料的制备是研制超轻型多波段伪装遮障的关键技术之一。阐述了一种优化的制备热红外伪装遮障材料的关键技术、配方与工艺等。采用本体透明型方法制备了绿色和土色低发射率材料。检测结果表明,研制的低发射率防热红外伪装涂层样品具有红外发射率低、红外透明性好、多光谱兼容等特点。 相似文献
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综述了近年来国内外高分子材料在热红外伪装技术中应用的最新研究进展,并从结构与性能之间相互关系探讨了其应用机理,最后对高分子材料在热红外伪装技术中的发展趋势和应用前景进行了展望。 相似文献
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为解决纳米电子膜喷射敷膜的一致性和标准化,根据多元惨杂SnO材料配方的工艺指标要求,依据人工喷射过程中温度、压力和时间的经验数据,采用人工神经网络和模糊协同控制方法,建立了电子膜加热元件敷膜过程的自动喷射系统,分析了基于神经网络的模糊协同敷膜控制技术的可行性,并通过实例进行了分析.结果表明,采用模糊协同控制喷射系统能够控制电热膜元件表面的功率密度,元件表面膜层均匀、单位功率一致,使电子膜加热元件的制作工艺达到了标准化. 相似文献
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非制冷红外FPA结构设计及物理特性有限元模拟 总被引:1,自引:0,他引:1
提出了一种薄膜式镂空双材料单层膜微悬臂梁结构的非制冷红外焦平面成像阵列(FPA,FocalPlateArray)。通过测量热膨胀系数相差较大的两种材料构成的悬臂梁受到红外辐射后的热形变分布,得到红外源的温度分布,从而实现在基于光力效应的光学读出系统中成像的目的。利用解析法建立了单层膜悬臂梁结构的热机械模型,用有限元软件对其优化参数下的热学性能和耦合特性进行了有限元的计算机模拟与分析。模拟热机械灵敏度结果为2.49×10-4deg/K,与热机械模型预测结果基本一致,为FPA的结构设计提供了有效的参数依据。 相似文献
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采用PECVD法制备用于室温红外探测器中热敏感材料的掺硼a-Si薄膜。通过系统地研究气体流量、射频功率与衬底温度等制备工艺条件与薄膜的电导率、含氢量和电阻温度特性的相关性,得到了最佳的工艺条件,并利用其制备出了探测灵敏度高达2.17×108cmHz1/2W-1的a-Si室温红外探测器。 相似文献
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目的 总结和展望可见光波段自适应伪装材料和红外波段自适应伪装材料的发展趋势及应用现状,为进一步研究和应用提供参考.方法 基于军用服饰对抗的不同波段,总结归纳了光致变色材料、电致变色材料、热致变色材料、相变材料、电致变发射率材料、电致变温材料和光子晶体材料的发展现状.结果 自适应伪装材料在军用服饰上的应用形式多,且相关产品在不断更新换代.结论 光学自适应伪装材料可适应不同场景不同要求下的变色需求,电致变发射率材料等红外自适应伪装材料可以用于军用红外伪装中,进一步完善可实现自适应红外隐身,人工光子晶体材料作为自适应伪装材料也可用于军用产品,目前已从多角度进行研发、实验,具有很大的应用前景及发展潜力. 相似文献
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采用着色颜料、红外低发射率填料、水性聚氨酯树脂等制备水性多波段伪装涂料,采用刮涂工艺,制备可见光/近红外/热红外多波段伪装涂层织物。通过双波段发射率测量仪、光谱反射率测试仪、光泽度仪等测试手段对涂层的红外发射率、光谱反射率、镜面光泽度等性能进行了表征,此外还对涂层的理化及环境性能进行了测试。结果表明:涂层的颜色满足《GJB 1082—1991伪装网用颜色》的要求,近红外光谱反射特性在380~1100nm范围内与应用背景基本实现了"同色同谱",不同颜色斑块的发射率梯度在0.13以上,在红外成像下能够形成有效的梯度分割,与应用背景具有较好的融合效果,具有可见光/近红外/热红外隐身性能,各项指标均达到了实用要求。 相似文献
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Thermal camouflage technologies, which aim at blending the infrared (IR) signature of targets into the background to counter the IR detection, have witnessed increasing development. To achieve thermal camouflage, the rule of thumb is to balance the thermal radiation between the target and the background, and the corresponding conductive strategy is to tune the local temperature field while the radiative strategy is to tune the local emissivity. Following these two basic strategies, the thermal metamaterials and wavelength-selective emissivity engineering to achieve thermal camouflage are first introduced. Then the more advanced dynamic strategies are reviewed that can adapt to the varying environment under the external stimuli, like electricity, light, strain, chemical, wetting, temperature, etc. Particularly the phase-changing and bioinspired materials are presented and reviewed. Finally, critical considerations on the challenges and opportunities of next-generation thermal camouflage technologies are elaborated and four future directions are cast, including temperature-responsive emissivity engineering, soft materials, multispectral camouflage, and detection-feedback system. Overall, a detailed introduction to the working principle, the state-of-the-art progress, and the critical thinking on the future development on thermal camouflage technologies are presented. 相似文献
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Low-power concentration and separation using temperature gradient focusing via Joule heating 总被引:1,自引:0,他引:1
We present an experimental study of temperature gradient focusing (TGF) exploiting an inherent Joule heating phenomenon. A simple variable-width PDMS device delivers rapid and repeatable focusing of model analytes using significantly lower power than conventional TGF techniques. High electric potential applied to the device induces a temperature gradient within the microchannel due to the channel's variable width, and the temperature-dependent mobility of the analytes causes focusing at a specific location. The PDMS device also shows simultaneous separation and concentration capability of a mixture of two sample analytes in less than 10 min. An experiment combining Joule heating with external heating/cooling further supports the hypothesis that temperature is indeed the dominant factor in achieving focusing with this technique. 相似文献
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Adhesion and friction tests were carried out in order to investigate the effect of temperature on the tribological characteristics of poly(methylmethacrylate) (PMMA) film using AFM. The pull-off and friction forces on the PMMA film were measured under a high vacuum condition (below 1 × 10(-4)?Pa) as the temperature of the PMMA film was increased from 300 to 420?K (heating) and decreased to 300?K (cooling). Friction tests were also conducted in both high vacuum and air conditions at room temperature. When the temperature was 420?K, which is 25?K higher than the glass-transition temperature (T(g)) of PMMA, the PMMA film surface became deformable. Subsequently, the pull-off force increased in proportion to the maximum applied load during the pull-off force measurement. In contrast, when the temperature was under 395?K, the pull-off force did not depend on the maximum applied load. The friction force began to increase when the temperature rose above 370?K, which is 25?K lower than the T(g) of PMMA, and rapidly increased at 420?K. Decrease of the PMMA film stiffness and plastic deformation of the PMMA film were observed at 420?K in force-displacement curves. After the heating to 420?K, the coefficient of friction was measured under air condition at room temperature and was found to be lower than that measured before the heating. Additionally, the RMS roughness increased as a result of heating. 相似文献
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石墨烯因其优异的导电性、优越的柔韧性和环境稳定性, 在可穿戴电子纺织品领域发挥了重要作用。本工作通过丝网印刷技术分别将自制的石墨烯浆料和复合热致变色油墨印在聚酯织物的正反面, 构筑了一种石墨烯基绿-黄可逆电热致变色织物。采用SEM、XRD以及FTIR等分析了织物的结构性质和变色原理, 采用红外热成像仪及全色差色度仪研究了织物的热学以及变色性能。结果表明:石墨烯电热致变色织物厚度约为250 μm, 在12 V电压下逐渐加热超过45 ℃, 焦耳热主要通过热传导至变色层, 结晶紫内酯的闭开环实现绿-黄可逆变色, 其变色响应时间约为15 s, 褪色响应时间约为27 s。石墨烯电热致变色织物经历30°~180°的弯曲角度后, 电压-电流曲线保持稳定。经200次加热/冷却循环后, 性能未发生明显衰退。本研究成功制备了颜色在绿-黄之间变化、响应迅速、循环性能良好的可逆电热致变色织物:石墨烯膜‖聚酯织物‖热致变色膜, 在军事伪装和可穿戴显示领域有一定的应用前景。 相似文献