E波段折叠矩形槽波导行波管的研究

分析了一种适用于E波段81~86 GHz空间行波管的新型慢波结构——折叠矩形槽波导.折叠矩形槽波导来源于传统的矩形槽波导,将E面沿其纵向来回弯曲而形成.利用电磁场仿真软件Ansoft HFSS设计优化并最终确定了E波段折叠矩形槽波导的关键几何尺寸.同时,模拟仿真出了折叠矩形槽波导在中心频率f=83.5 GHz处的耦合阻抗沿x和y方向上的变化趋势,得出其可通过加载带状电子注获得更高的平均耦合阻抗.利用CST粒子工作室模拟得出:折叠矩形槽波导行波管在中心频点83.5 GHz处输出功率为210 W,电子效率达到8.05%.     

Omnidirectional Bending and Pressure Sensor Based on Stretchable CNT‐PU Sponge

Bending and pressure sensors are very essential for evaluating external stimuli in human motions; however, most of them are separate devices. Here, two orthogonal carbon nanotube–polyurethane sponge strips (CPSSs) are used, each of which has different resistances when bent or pressed, to fabricate a multi‐functional stretchable sensor capable of detecting omnidirectional bending and pressure independently. Due to the shape of the strip, the resistance of CPSS changes differently when bent along different directions. Based on this feature, two perpendicular CPSSs can reflect information of both bending distance and bending direction. After basic measurement data are obtained, a function set can be formulated to calculate bending distance and bending direction simultaneously. The errors of bending distance and bending angle can be controlled to less than 4%. With the help of the triboelectric effect, which only happens when the device is pressed, the sensor can differentiate bending and pressure effectively, ensuring the device works in complex situations.     

Wearable Force Touch Sensor Array Using a Flexible and Transparent Electrode

Transparent electrodes have been widely used for various electronics and optoelectronics, including flexible ones. Many nanomaterial‐based electrodes, in particular 1D and 2D nanomaterials, have been proposed as next‐generation transparent and flexible electrodes. However, their transparency, conductivity, large‐area uniformity, and sometimes cost are not yet sufficient to replace indium tin oxide (ITO). Furthermore, the conventional ITO is quite rigid and susceptible to mechanical fractures under deformations (e.g., bending, folding). In this study, the authors report new advances in the design, fabrication, and integration of wearable and transparent force touch (touch and pressure) sensors by exploiting the previous efforts in stretchable electronics as well as novel ideas in the transparent and flexible electrode. The optical and mechanical experiment, along with simulation results, exhibit the excellent transparency, conductivity, uniformity, and flexibility of the proposed epoxy‐copper‐ITO (ECI) multilayer electrode. By using this multi‐layered ECI electrode, the authors present a wearable and transparent force touch sensor array, which is multiplexed by Si nanomembrane p‐i‐n junction‐type (PIN) diodes and integrated on the skin‐mounted quantum dot light‐emitting diodes. This novel integrated system is successfully applied as a wearable human–machine interface (HMI) to control a drone wirelessly. These advances in novel material structures and system‐level integration strategies create new opportunities in wearable smart displays.     

井下供水管网自动调节与监控系统研制与应用

针对许厂煤矿井下经常出现供水短缺或供水过量的情况,设计了一套基于MCGS（监视与控制通用系统,Moni．toyandControlSystem）和S7-200PLC的自动控制供水调节与监控系统。该系统采用MCGS作为组态软件,S7-200PLC作为核心CPU进行设计,经在许厂煤矿现场实践,该系统能根据管路上水压的大小实时地调节水阀的开度,使水管上的水压保持恒定,并能利用井下工业以太网通信技术实现井下整个供水和供风管网的远程实时监控。     

互感器传输窄脉冲RC展宽的驱动器设计方法( 下)

介绍了RC展宽电路工作原理、稳定工作的条件、防交互干扰措施、窄脉冲宽度τ1=τ2的选择原则,分析了RC展宽电路顶降产生的原因和不可消除性、RC时间常数与脉宽τ的比例关系以及负偏压保存的条件,讨论了铁芯Sc的选择原则和采用平衡变压器的可行性,并提出一种新型的R+ VS2加速网络和更为简化的RC展宽电路.     

一种无人机载小型SAR发射机的设计

无人机载雷达有更严格的体积、重量要求,另外,受载机供电限制,雷达主功率设备的效率也是重要指标,在保证发射机高频谱纯度和可靠性的同时,也要综合考虑上述因素.文中介绍了某无人机载小型SAR发射机设计的几点要求,针对各个重要组件工作原理作了详细论述,最后给出了理论计算、仿真与实际测试结果,证明该发射机满足无人机载小型SAR的带宽、功率、平坦度等指标,具有较高频谱纯度和可靠性.     

慢流CO_2激光器最佳冷却条件的实验研究

螺旋水冷慢流CO_2激光器件比普通慢流器件输出激光功率高16%。瓷管慢流器件气、水逆流较气、水顺流运用激光功率高7.6%。给出了最佳冷却条件。     

微波管雷基图的自动测试技术

本文介绍采用计算机控制微波可变负载,同时采集输出功率和频率,由计算机进行数据处理,并画在极坐标圆图上(此圆图事先由同一计算机绘制而成),整个过程全部自动化。对微波电子管和固态微波器件的实测表明,性能优良,结果可靠,经过适当改进,测绘时间还可大大缩短,从而可供微波管特别是微波灶用连续波磁控管生产线上作检验之用。     

All‐Fiber Structured Electronic Skin with High Elasticity and Breathability

With the rapid advancement in artificial intelligence, wearable electronic skins have attracted substantial attention. However, the fabrication of such devices with high elasticity and breathability is still a challenge and highly desired. Here, a route to develop an all‐fiber structured electronic skin with a scalable electrospinning fabrication technique is reported. The fabricated electronic skin is demonstrated to exhibit high pressure sensing with a sensitivity of 0.18 V kPa^?1 in the detection range of 0–175 kPa. This wearable device could maintain prominent sensing performance and mechanical stability in the presence of large deformation, even when the elastic deformation is up to 50%. The electronic skin is easily conformable on different desired objects for real‐time spatial mapping and long‐term tactile sensing. Besides, it possesses high gas permeability with a water vapor transmittance rate of 10.26 kg m^?2 d^?1. More importantly, the electronic skin is capable of working in a self‐powered manner and even serves as a reliable power source to effectively drive small electronics. Possessing several compelling features, such as high sensitivity, high elasticity, high breathability as well as being self‐powered and scalable in fabrication, the presented device paves a pathway for smart electronic skins.     

ICP型噪声传感器调理电路设计

为满足航天高声压160dB噪声测量的需求,使用ICP型噪声传感器进行测量,针对ICP型噪声传感器工作条件及其输出信号,设计一种调理电路。利用LM134同时实现ICP型噪声传感器恒流和高压激励的工作条件,通过轨到轨运放AD824完成对ICP型噪声传感器输出信号的放大、滤波、跟随等以达到采集系统需要的0~5 V电压信号。在130 dB^160 dB噪声下,ICP型噪声传感器与调理电路配合标定相对误差<1%,该调理电路可以与ICP型噪声传感器很好地配合使用。