用于红外探测的新型冷却器—脉冲管制冷机

脉冲管制冷技术近年来的突破性进展,使其可在相当多的领域得到应用。本文通过分析和比较,结合作者等人近几年来的研究结果,给出脉冲管制冷机应用于红外探测器件冷却的可行性。     

Inductively coupled plasma etching for large format HgCdTe focal plane array fabrication

Inductively coupled plasma (ICP) using hydrogen-based gas chemistry has been developed to meet requirements for deep HgCdTe mesa etching and shallow CdTe passivation etching in large format HgCdTe infrared focal plane array (FPA) fabrication. Large format 2048×2048, 20-μm unit-cell short wavelength infrared (SWIR) and 2560×512, 25-μm unit-cell midwavelength infrared (MWIR) double-layer heterojunction (DLHJ) p-on-n HgCdTe FPAs fabricated using ICP processing exhibit >99% pixel operability. The HgCdTe FPAs are grown by molecular beam epitaxy (MBE) on Si substrates with suitable buffer layers. Midwavelength infrared detectors fabricated from 4-in. MBE-grown HgCdTe/Si substrates using ICP for mesa delineation and CdTe passivation etching demonstrate measured spectral characteristics, RoA product, and quantum efficiency comparable to detectors fabricated using wet chemical processes. Mechanical samples prepared to examine physical characteristics of ICP reveal plasma with high energy and low ion angle distribution, which is necessary for fine definition, high-aspect ratio mesa etching with accurate replication of photolithographic mask dimensions.     

焦平面读出电路设计中的低温应用研究

焦平面读出电路是焦平面探测器的核心部件之一,本文介绍了焦平面读出电路在低温(77 K)应用下的一些特殊的效应,以及在低温下CMOS器件的几个重要参数的计算模型,有了这些,就可以在读出电路设计阶段预先考虑这些效应,从而设计出性能优良的读出电路。     

红外法TIG焊熔透质量的控制

选用PbS红外探测器作为熔透传感器以测量焊缝背面受热区光电熔透信号,采用固定点控制焊接电流脉冲宽度的控制方案,组成钢和铝TIG焊熔透适应系统,这种控制系统能够获得均匀熔透的薄板TIG焊焊缝。     

红外吸收法测定氧化铁皮中硫含量的研究

应用红外碳硫仪测定了氧化铁皮中的硫，对选择适当的测定条件如助熔剂、分析时间等进行了探讨，确定了最佳的分析条件及氧化铁皮中硫的测定方法。     

基于五轴转台红外目标/干扰模拟器的实施方案

基于五轴转台的红外制导武器半实物仿真系统,以目标 /干扰环境成像质量好、光能利用率高、目标视线误差小为特色,是红外半实物仿真领域的佳作。而基于五轴转台红外目标 /干扰模拟器的轻质量和抗震动、抗冲击性能,是其中的关键。本文介绍了基于五轴转台红外目标 /干扰模拟器的实施方案, 系统设计过程中为减轻其质量采取的一系列重要的措施,以及系统误差源的分析和误差的分配原则。     

应用红外监测推进电力设备状态维修

电力设备运行状态的红外监测和故障诊断是一种新兴技术。本文从红外监测技术的基本原理和其优点上说明它将在电力设备维修体制向状态维修体制过渡中扮演重要角色     

硒化锌基底8μm～12μm高效高稳定性减反射膜的研究

文中讨论了硒化锌基底上的高效高稳定性红外减反射膜的设计与制备。介绍了离子束辅助沉积该膜系的过程，给出了用该方法制备的8μm-12μm波段宽带减反射膜的实测光谱曲线，其峰值透过率高达99％以上，在设计波段范围内平均透过率大于98％，膜层附着性能好，光机性能稳定。     

Physico-chemical properties of V-Sb-oxide systems and their catalytic behaviour in oxidative dehydrogenation of light paraffins

Catalysts prepared as bulk VSb_0.1O_x and supported V₂O₅/Al₂O₃, V₂O₅-Sb₂O₃/Al₂O₃ and Sb₂O₃/Al₂O₃ (containing 0.5, 1 or 2 theoretical monolayers of V₂O₅ or Sb₂O₃) were tested in the oxidative dehydrogenation of iso-butane at 550°C in i-C₄H₁₀:O₂:He=20:10:70 gas mixture. Fresh and used catalysts were characterised by BET, XRD and XPS. Reactivity and thermochemistry of active oxygen taking part in the redox cycle with ethane and hydrogene were studied using in situ differential scanning calorimetry. Temperature-programmed desorption of O₂ in He flow was also investigated and in situ DRIFT was applied to investigate surface species of the catalysts in flows of i-C₄H₁₀, O₂ and i-C₄H₁₀/O₂ mixture. Supported VSb_yO_x catalysts are more active and selective than bulk one. V-only supported catalysts display a high efficiency due to the high reactivity of VOX-species. In bulk catalyst, the surface is enriched with antimony. In supported samples, the surfaces V/Sb are close to the calculated ones. In the presence of antimony, the amount of active oxygen species and their reactivity in redox transformation is improved. The rates of vanadium reduction and reoxidation are also higher. Compared to V-only catalysts, supported V-Sb-catalysts display a lower coking activity and higher on-stream stability.     

红外光电转速测量仪

介绍一种用于转子速度测量的红外光电转速测量装置，其传感器采用光电自准直结构，以红外光作为检测光源。光电探测器输出的电信号经过前置放大、动态峰值检出、二值化整形处理及锁相倍频后，由单片机进行计算处理。单片机采用测量脉冲周期和测量脉冲信号个数相结合的方法计算转子转速，既能保证检测的实时性，测量精度也高。转速测量范围可从10r／min到100000r／min。