含远红外辐射物质聚合物的组成与远红外发射性能

测试了含有不同种类和呈的远红外辐射物质粉末的聚丙烯薄片,在５０℃时的全波长和分波段远红外发射率。结果发现,聚丙烯中加入远红外辐射物质后不同程度地显著增大了试样的５０℃全波长和分波段远红外发射率,试样的最大远红外发射率与纯远红外辐射物质接近;试样的组成与其发射率之间存在一定规律性。当试样中的远红外辐射物质粉末含量逐渐增加时,试样的发射迅速增大并达到极大值,此后又迅速降低,极值出现时的试样组成与远红外     

弹性薄层反辐射隔热涂料的研究

对纳米氧化钇、纳米氧化锡、远红外陶瓷粉、改性空心玻璃微珠、金红石型氧化钛、云母为填料制备的涂层及硅丙、纯丙等乳液涂层进行了紫外-可见-近红外反射率测试,选取了近红外反射率较高的改性空心玻璃微珠、金红石型氧化钛,可见光反射率较高的远红外陶瓷粉为填料,与纯丙、硅丙等弹性乳液共混,制备了环保型弹性反辐射隔热涂料,并对其隔热效果、基本性能进行了研究.结果表明,该涂料具有良好的隔热效果和施工、使用性能,应用前景十分广阔.     

远红外感应加速剂

众所周知,使用远红外加热器促使涂层干燥,比过去采用的方法效果显著增加,例如粉未涂装用热风炉在200℃需要25分钟,而改用远红外处理只需8分钟。为了使远红外加热技术能更快的加速涂层固化,最近研制出一种与远红外辐射波长相宜的感应     

绿色背景下可见光-近红外与热辐射波段具备特征反射光谱薄膜的研究

分析了白天以绿色植物为背景的地物在可见光-近红外和中远红外波段辐射特性的差异,发现应该采用不同的原理对可见光-近红外和中远红外进行隐身。在此基础上分析了传统涂料和光子晶体结构在多波段兼容隐身的缺陷,提出运用多层薄膜结构来实现兼容隐身,研究设计了具备特征光谱的多层薄膜。该膜系在可见光-近红外波段具有与一般绿色植物相似的反射光谱特征,可以模拟绿色植物光学亮度特性,并且在中远红外大气窗口内的平均发射率分别为0.232和0.195,可以在一定程度上抑制目标的热辐射。     

纳米远红外建筑内墙涂料的研究

阐述了纳米远红外建筑内墙涂料的组成、制备工艺和性能,并讨论了该涂料的远红外发射能力和对人体的医疗保健作用.     

低温远红外辐射物质的组成与发射性能

系统研究了金属和非金属氧化物及其混合物的低温远红外辐射性能。结果表明,氧化铝、氧化钛、氧化锆、氧化硅、莫来石、高岭土和绢云母等或其混合物是性能良好的低温远红外辐射物质煅烧对其低温远红外发射率影响不大,而且这些物质５０℃下的４－１４μｍ波 远红外发射率往往高于其在高温下的同波段远红外发射率,而过渡金属氧化物物其混合物的低温远红外发射性能较其高温远红外发射性能略差,煅烧可显著提高其低温远红外发射性能。     

水分测定电子天平关键技术研究

水分测定电子天平能够解决烘干失重法水分测量时间长、操作烦琐、样品在冷却过程中吸收空气中水分造成附加误差等问题,具有广阔的应用前景。文中研究了一种快速烘干水分测定电子天平,探讨了远红外辐射加热方法、温漂与时漂对水分测定电子天平影响等几个关键问题,提出了加速试样失水方法和抑制水分测定电子天平温漂与时漂的硬、软件设计方法,实际应用验证了方法的正确性。     

远红外功能材料的发展与应用

综合国内外文献资料介绍了远红外辐射的机理的,重点介绍了国内外远红外功能材料方面的研究现状以及与此相关的文献、专利情况;提出对我国的丰富的矿物材料进行改性等深加工,从而制备性能优良的远红外功能材料,最后展望了远红外功能材料的应用领域与发展趋势.     

双波段红外隐身技术研究

研究了红外辐射率对双波段红外隐身效果和辐射温度的影响.结果表明,当材料的辐射率降低到0.50左右时,足以满足目标的红外隐身要求;相同辐射率目标中远红外的辐射温度不同,中红外辐射温度比远红外辐射温度低,目标红外辐射率越低,中远红外辐射温度差就越大,且目标中远红外波段辐射温差为目标表面辐射率的函数;为了获得良好的双波段红外隐身效果,目标所处背景宜选择那些具有不同辐射温度的斑驳背景.     

罩泡包装机的加热技术

罩泡包装机的加热对象是塑料,加热方式有两种,接触式和辐射式.均由独立的加热器件来完成.加热器件的质量直接影响罩泡包装机的工作效率和可靠性.采用先进加热技术制造加热器件巳成为优秀罩泡包装机不可缺少的环节.以下主要介绍辐射加热器的原理、性能和使用技术.一、辐射加热器制造原理优秀的罩泡包装机的辐射加热器是采用远红外技术制造的.远红外技术是七十年代迅速发展的高效节能加热技术.其实质是利用波长2.5～25μm的     

Infrared holography using a microbolometer array

We describe a series of experiments to demonstrate holography at far-infrared wavelengths using an uncooled microbolometer array. Simple interference patterns and Fresnel zone holograms are recorded with a 10 W cw CO(2) laser illumination in a Mach-Zehnder interferometer setup. A sparse-sampling method is used to sample the hologram at a rate dependent on the bandwidth of the object wavefront rather than the carrier frequency. The samples are then used to reconstruct the complex object wavefront in the hologram plane, which is Fresnel backpropagated for image reconstruction. Uncooled microbolometer arrays are most commonly used in passive mode to image the thermal-blackbody radiation. Their technology has matured to include the wavelength range of far-infrared to submillimeter radiation. The use of microbolometers with active illumination for holography, as described in this paper, suggests their interesting future applications.     

Mid/far-infrared few-cycle-pulse emission via resonant mixing in semiconductor heterostructures

Abstract

Mid/far-infrared emission from a semiconductor multiple quantum well structure under femtosecond optical pulse excitation is studied. It is shown that resonant nonlinear-wave mixing in the quantum wells can be used for the generation of ultra-short mid/far-infrared pulses with a duration of a few cycles or even a single cycle. Explicit analytical formulas for the mid/far-infrared radiation field and polarization in a simple three-level model of a quantum well are presented and compared with numerical simulations. The power of the mid/far-infrared emission and the down conversion efficiency of the resonant nonlinear-wave mixing are discussed.     

Intersubband Rabi oscillations in asymmetric nanoheterostructures: implications for a tunable continuous-wave source of a far-infrared and THz radiation

A tunable continuous-wave source of a far-infrared and THz radiation based on a semiconductor nanoheterostructure with asymmetric quantum wells is suggested. It utilizes Rabi oscillations at a transition between quantum well subbands excited by external femtosecond pulses of a mid-infrared electromagnetic field. Due to quantum well broken inversion symmetry the subbands possess different average dipole moments, which enables the creation of polarization at the Rabi frequency as the subband populations change. It is shown that if this polarization is excited so that it is periodic in space, then, though being pulsed, it can produce continuous-wave output radiation. Changing the polarization space period and the time intervals between the exciting pulses, one can tune the frequency of this radiation throughout the far-infrared and THz range. In the present work a concrete multiple quantum well heterostructure design and a scheme of its space-periodic polarization are suggested. It is shown that for existing sources of mid-infrared femtosecond pulses the proposed scheme can provide a continuous-wave output power of order the power of far-infrared and THz quantum cascade lasers. Being added to the possibility of its output frequency tuning, this can make the suggested device attractive for fundamental research and various applications.     

Computational design of solar reflection and far-infrared transmission films for a variable emittance device

A smart radiation device (SRD) that is a variable emittance radiator has been studied as a method of thermal control for spacecraft. The SRD consists of manganese oxide with a perovskite-type structure, and the total hemispherical emittance of the SRD changes considerably depending on temperature. Here we propose an optimal method of designing multilayer films for the SRD by using agenetic algorithm. The multilayer films reflect solar radiation and transmit far-infrared radiation to maintain variation of the infrared optical properties of the SRD.     

Research of Ultra-Black Coating Emissivity Based on a Controlling the Surrounding Radiation Method

A method of controlling the surrounding radiation, proposed to measure the emissivity of the sample with high accuracy, is introduced. Two disks at different temperatures are moved alternately in front of the sample for controlling the surrounding radiation of the sample. The emissivity of the sample is obtained from the relationship between the measured value of the radiation thermometer and the radiation from the sample. There are three samples, including the Japansensor JSC-3, Tempil Pyromark 1200, and NEXTEL Velvet Coating 811-21 ultra-black coating, measured by this method. The uncertainty contributions of this method are analyzed, and the uncertainty of the emissivity measurement method is 0.54 % (k?=?1). The surface microstructure of the coatings is measured by scanning electron microscopy, and the relationship between emissivity and the surface properties is discussed.     

水性环氧耐核辐射涂料的制备

以环氧改性胺乳液为A组分,环氧树脂为B组分,制备了性能优异且环保的水性环氧耐核辐射涂料。研究了环氧改性胺乳液、耐核辐射颜填料及颜料体积浓度(PVC)等因素对涂料性能的影响。结果表明,采用环氧改性芳香胺为固化剂,配合功能性填料钛酸钾晶须制备的水性环氧耐核辐射涂料具有优良耐辐照性能及去污性能,经过8.5×105GY(累积剂量)辐照后漆膜完好,附着力良好。     

Cooled baffle system for spaceborne infrared telescopes

We report the design and testing of a compact system of baffles for cooled infrared telescopes. The baffle system consists of a reflecting forebaffle and a black aftbaffle and provides a high level of rejection of emission from off-axis sources. The forebaffle reflects radiation incident at angles greater than 40° off axis out of the telescope, thereby reducing the aperture heat load. The black aftbaffle absorbs radiation scattered or diffracted by the forebaffle, as well as radiation from sources within 40° off axis. We describe ground-based measurements at λ = 0.9 μm of the baffle system at ambient temperature and rocketborne measurements at far-infrared wavelengths of the baffle system at ~3 K. The effective emissivity of the cooled forebaffle was measured to be 7 × 10(-3). The system has been successfully used in rocketborne measurements of the diffuse infrared background and will be used in the Infrared Telescope in Space.     

Materials for terahertz science and technology

Terahertz spectroscopy systems use far-infrared radiation to extract molecular spectral information in an otherwise inaccessible portion of the electromagnetic spectrum. Materials research is an essential component of modern terahertz systems: novel, higher-power terahertz sources rely heavily on new materials such as quantum cascade structures. At the same time, terahertz spectroscopy and imaging provide a powerful tool for the characterization of a broad range of materials, including semiconductors and biomolecules.     

硅溶胶-纯丙复合乳液反射隔热涂料的制备及性能

研究了一种以硅溶胶和纯丙乳液为复合基料的反射隔热涂料。研究表明,基料中硅溶胶比例增加有助于提高涂膜的太阳光反射比和污染后的太阳光反射比,涂膜表面对水的接触角也逐渐增大。通过正交试验确定了混合基料的最佳方案:硅溶胶粒径为10~15 nm,硅溶胶与纯丙乳液的比例为5∶4,硅烷偶联剂的添加量为4%。研究了二氧化钛的种类和含量对涂膜反射隔热性能的影响,使用改性二氧化钛,相对于金红石型二氧化钛,涂膜的太阳光反射比、近红外反射比以及隔热温差有很大提高。此外,研究了辐射型填料的粒径和含量对涂膜半球发射率与隔热性能的影响,使用粒径为1.05μm辐射型填料,添加量为8%时,涂膜的半球发射率达到最大。最终制备出一种具有耐沾污、高热反射和辐射能力的无机-有机复合型反射隔热涂料。