摘要：太赫兹波在超材料表面结构中会发生电磁响应,使得特定频率的电磁波发生反射与透射。利用VO2的相变特性,设计了一种基于超材料的可调谐三信道太赫兹分波器。采用Drude模型,分析了该分波器两种状态下的仿真S参数曲线、等效参数曲线和群延迟曲线,并研究了分波器的工作机理。处于通信窗口的0.30、0.46、0.50 THz太赫兹波实现了分离,分波器的隔离度均大于22 dB,插入损耗均小于0.40 dB,群延迟低且性能指标受参数变化的影响较小,满足工作性能的设计要求。与传统的光子晶体和绝缘硅分波器相比,所设计的分波器具有隔离度高和插入损耗低等特点。与超材料二信道分波器相比,所设计的分波器提高了信道容量,实现了信道可调谐功能。所设计的分波器在太赫兹无线通信波分复用系统中,展现出实现多信道传输的潜力,具有较好的应用前景。

摘要：针对传统计步算法精度低适用性不高的问题,提出了一种基于MEMS足部定位模块的高精度自适应步长估计算法。首先通过分析行人步态的周期特征,精确地判断每个步态周期中单脚离地和落地的时间差值,采用零速更新法结合时间阈值、加速度阈值和加速度方差阈值进行步态检测;然后对转换后地理坐标系下传感器信号进行双重积分,计算出行人每一步的空间轨迹,无需进行前期步长数据采集或者生物模型参数提取,即可实现对行人步长的精确估计。在AHRS_box惯性传感器模块上进行了实验,结果表明该算法估计得出的步长和行走距离误差均小于2.5%,证实了该算法的有效性。

摘要：A novel fluid sensing system based on side-polished optical fiber(SPOF)is proposed,which realizes the fluid replaceability and effective refractive index(RI)sensing *** investigations demonstrate that the photonic bandgap effect can be obtained if the RI of liquid is higher than that of substrate material in the wavelength range *** relationship between bandgap edge wavelength and RI is studied *** SPOF with a depth of 57μm is used in the experiment to realize the construction of the fluid *** filling three different liquids,the result shows that the wavelength of the bandgap edge has a red shift with RI increased,which is nearly linear in the RI range of 1.56—1.6 with a sensitivity about 5543.64 nm/*** proposed sensing system can be flexibly applied to the field of fluid characteristic sensing such as biochemical solution characteristic detections.