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关键词： Energy transfer  

摘要： Electric vehicle (EV) has emerged as a transformative force for the sustainable and environmentally friendly future. To alleviate range anxiety caused by battery and charging facility, dynamic wireless power transfer (DWPT) is increasingly recognized as a key enabler for widespread EV adoption, yet it faces significant technical challenges, primarily in precise coil alignment. This article begins by reviewing current alignment methodologies and evaluates their advantages and limitations. We observe that achieving the necessary alignment precision is challenging with these existing methods. To address this, we present an innovative RFID-based DWPT coil alignment system, utilizing coherent phase detection and a maximum likelihood estimation algorithm, capable of achieving sub-10 cm accuracy. This system's efficacy in providing both lateral and vertical misalignment estimates has been verified through laboratory and experimental tests. We also discuss potential challenges in broader system implementation and propose corresponding solutions. This research offers a viable and promising solution for enhancing DWPT efficiency. © 2023, CC BY.

关键词： Authentication  

摘要： In this paper, authentication for mobile radio frequency identification (RFID) systems with low-cost tags is studied. Firstly, an adaptive modulus (AM) encryption algorithm is proposed. Subsequently, in order to enhance the security without additional storage of new key matrices, a self-updating encryption order (SUEO) algorithm is designed. Furthermore, a diagonal block local transpose key matrix (DBLTKM) encryption algorithm is presented, which effectively expands the feasible domain of the key space. Based on the above three algorithms, a novel joint AM-SUEO-DBLTKM encryption algorithm is constructed. Making full use of the advantages of the proposed joint algorithm, a two-way RFID authentication protocol, named AM-SUEO-DBLTKM-RFID, is proposed for mobile RFID systems. In addition, the Burrows-Abadi-Needham (BAN) logic and security analysis indicate that the proposed AM-SUEO-DBLTKM-RFID protocol can effectively combat various typical attacks. Numerical results demonstrate that the proposed AM-SUEO-DBLTKM algorithm can save 99.59% of tag storage over traditional algorithms. Finally, the low computational complexity as well as the low storage cost of the proposed AM-SUEO-DBLTKM-RFID protocol facilitates deployment within low-cost RFID tags. Copyright © 2023, The Authors. All rights reserved.

关键词： Sensors   Rectifiers   Radiofrequency identification   Radio frequency   Feeds   Wireless sensor networks   Wireless communication   Differential feed rectifier   power management   radio frequency energy harvesting (RF-EH)   radio frequency identification (RFID) sensor   wireless power and data transfer (WPDT)  

摘要： The radio frequency identification (RFID) sensors featuring simultaneous wireless power and data transfer (WPDT) have provided promising potentials for flexible sensing and communication in future industrial applications. The performance of RFID sensors regarding the number of integrated sensors and interrogation distance is constrained by the efficiency of radio frequency energy harvesting (RF-EH) and the power management techniques for efficient power utilization. This investigation presents a design methodology for multisensor augmented RFID sensor focusing on the RF-EH efficiency, power management, and the system's overall performance. The contributions include: 1) a multisensor augmented RFID design scheme to improve the efficiency of RF-EH and power utilization;2) design of a planar inverted-F antenna (PIFA) and a differential feed Greinacher rectifier to improve the RF-EH efficiency;and 3) a power management optimization method to improve the power utilization efficiency based on the budgeting and analysis of the components' consumption. A prototype system integrating temperature, humidity, and illuminance sensors is developed and experimentally verified. The presented techniques are proven a good reference for the research and practice of power-efficient sensing.

关键词： Sensors   Humidity   Encoding   RFID tags   Wireless sensor networks   Resonant frequency   Monitoring   Environmental humidity detection   flexible tag sensor   frequency shift   radio frequency identification (RFID)   structural health monitoring (SHM)  

摘要： The rapid development of radio frequency identification (RFID) technology has significantly changed the method of structural health monitoring (SHM). In this article, a novel flexible chipless RFID tag sensor is proposed to monitor the change of relative humidity (RH) in the environment around structures. The tag is fabricated on a flexible substrate that can be transferred to a bendable metal surface and is fused with a high encoding capacity for tag recognition. In addition, a low-cost detection and wireless transmission scheme for dynamic spectrum data transmission is used, which is more flexible and automatical than traditional detection methods. The simulation and experiment results show that the humidity sensitivity of the tag sensor coated with a polyvinyl acetate (PVA) film is about 0.584 MHz/RH in the RH range below 60% , and about 2.03 MHz/RH in the higher RH range. Meanwhile, the tag can maintain stable sensing performances in a certain bending range, which may be very desirable in many application scenarios.

关键词： RFID   PLC   硬件选型   方案设计   功能实现  

摘要： 在智能制造中,RFID电子标签可以准确地记录加工工序及工艺信息,满足柔性化的生产需求。该文通过研究RFID技术,在现有的智能产线上做升级改造,针对实际产线做RFID硬件选型及整体方案设计,实现RFID与工业PLC的ModBus TCP通信与数据交互,及时、准确地记录产品当前的生产信息,保证生产工艺可追溯的同时提高生产效率。

关键词： RFID   高校实验室   危险化学品   动态电子台账   批量盘点   全生命周期管理  

摘要： 随着高校“双一流”建设的不断深入和“新工科”建设的实施,实验室使用的危险化学品种类和数量逐年增加,由此引发的实验室安全事故时有发生。为了保证实验教学科研活动的正常进行,确保师生的人身安全,文章提出了建设实验室危险化学品智能管理平台,引进最先进的RFID技术、“互联网+”智能锁,探索一套适合高校实验室危险化学品全生命周期管理的有效途径,结果表明:该平台实现了可追溯的动态电子台账、智能预警、批量盘点、快速清点回收废瓶,为提升高校实验室危险化学品管理水平提供借鉴。

关键词： RFID   地铁供电设备   智能运维系统   系统数据库   码源信息   优先级  

摘要： 受地铁供电设备运行状态数据更新速度与数据自身规模的影响,相关运维系统在运行阶段发生冲突的频率较高。为此,文章对基于射频识别(Radio Frequency IDentification,RFID)技术的地铁供电设备智能运维系统设计进行研究,先完成RFID读写器的选取,设计数据传输方式,完成系统架构的搭建,然后构建系统数据库,实现对海量多元地铁供电设备运行状态数据的管理,最后以M-8000八通道超高频RFID读写器的码源信息为基础,设计涵盖优先级的运行逻辑。在测试结果中,系统的最大冲突数始终稳定在0.4次/s,且最大值仅为0.17次/s。

关键词： 视障乘客   地铁出行   导航系统   RFID技术   二维码导览  

摘要： 为了铺设“互联网盲道”,设计视障乘客能独立乘坐地铁的导航系统,从而实现无障碍通行,本文通过将RFID技术与二维码语音导航相结合,在导盲线路上使用RFID技术进行实时精准定位,在语音导航方面通过二维码和语音交互技术相结合实现实时语音播报导航。经测试,该系统在一定程度上能有效提高视障群体独立乘坐地铁的安全性和便利性。