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关键词： RFID技术   工业机器人   分拣实训装置   PLC  

摘要： RFID技术已广泛应用于工业制造领域,能够降低企业成本、提升企业智能制造能力。针对目前高职工业机器人专业实训的不足,提出基于RFID技术的工业机器人分拣实训装置的设计,以实现几种不同形状、颜色工件的分拣,对提升学生新技术应用能力和拓宽专业视野以期具有一定指导意义。

关键词： 防伪技术   防伪效果   承印物   光稳定性   喷墨打印   射频识别   批量生产   激光全息  

摘要： 一、引言商标伪造近几年频繁发生,严重损害了消费者利益,给消费者造成巨大的经济损失,甚至危及消费者的健康和生命。也由此催生了许多防伪技术,如射频识别、核径迹、激光全息和荧光印刷等。其中,荧光防伪印刷不仅具有易批量生产、设计灵活和较高的防伪效果等优点,同时还可以满足不同承印物的需要,是防伪技术的一大热点。传统荧光材料包括无机、有机荧光材料以及金属半导体,但是它们存在以下缺点:光稳定性不佳,结构稳定性差,水溶性差,存在一定毒性,对生态环境和人类健康构成较大威胁。

关键词： microwave sensors   RFID tags   humidity sensors   Nafion 117  

摘要： Chipless radio-frequency identification (RFID) sensors are not yet widespread in practical applications because of their limited sensitivity and selectivity when compared to more mature sensing technologies. The search for a suitable material to perform the sensing function has often been focused on the most common materials used in electrochemical sensing approaches, but little work has been done to directly relate the performances of chipless or microwave sensors to the characteristics of the materials used to fabricate them. In this work we are simulating the impact of the substrate material on the performances of a chipless RFID sensor for humidity detection. The dielectric parameters of the substrate material turn out to be very important to maximize the sensor performances, in relation to the operative range of the sensor (based on the desired application) and to the effective dielectric properties of the sensitive material used, we verify the simulated results with measurements of real chipless humidity cells with Nafion 117 sensitive material. We show which types of substrate are preferable for low-humidity detection and which substrates' features are instead fundamental to operate in a wider humidity range.

关键词： Computer vision   RFID   object detection   multi-object identification  

摘要： Obtaining fine-grained spatial information is of practical importance in Radio Frequency Identification (RFID)based systems for enabling multi-object identification. However, as high-precision positioning remains impractical in commercial-off-the-shelf (COTS)-RFID systems, researchers propose to combine computer vision (CV) with RFID and turn the positioning problem into a matching problem. Promising though it seems, current methods fuse CV and RFID through converting traces of tagged objects extracted from videos by CV into phase sequences for matching, which is a dimension-reduced procedure causing loss of spatial resolution. Consequently, they fail in harsh conditions like small tag intervals and low reading rates. To address the limitation, we propose TagFocus to achieve fine-grained multi-object identification with visual aids in RFID systems. The key observation is that traces generated through different methods shall be compatible if they are of one identical object. Accordingly, a Transformer-based sequence-to-sequence (seq2seq) model is trained to generate a simulated trace for each candidate tag-object pair. And the trace of the right pair shall best match the observed trace directly extracted by CV. A prototype of TagFocus is implemented and extensively assessed in lab environments. Experimental results show that our system maintains a matching accuracy of over 91% in harsh conditions, outperforming state-of-the-art schemes by 27%.

关键词： Strain   Resonant frequency   Strain measurement   Monitoring   RFID tags   Metals   Semiconductor device measurement   Chipless radio frequency identification (RFID)   coplanar coupling antenna   C-type resonator   log period dipole antenna (LPDA)   mechanical structure health monitoring (SHM)   planar microstrip structure   wireless strain measurement  

摘要： this article, a radio frequency identification (RFID) sensor tag for real-time health monitoring of the magnitude and direction of metal surface strain is presented. The chipless RFID sensor tag is composed of metal foil and F4B substrate, which is low-cost and works stably in harsh environments for a long time. Through highly sensitive strain monitoring, the risk can be predicted in the early stage of defect generation. The proposed tag includes a C-type resonator array, Q-type transmission line, and tag antennas. The C-type resonator has different sensitivities in the electrical length direction and width direction. Then, based on this characteristic, the resonator array creates a plurality of characteristic signatures containing strain information by optimizing the geometric parameters of the resonators. The strain information is transmitted to the tag antenna through the Q-type transmission line to complete the wireless communication between the tag and the reader. Finally, the performance of the strain monitoring system is verified by an experimental study. The experiment shows that the average sensitivity of the resonators is -4.94 and 1.14 kHz/mu e in the electric length and width directions, respectively. When the strain is more than 150 mu e, the relative error of magnitude is less than 12.7% and the absolute error of direction is less than 13.3(?). Therefore, the proposed chipless RFID tag can monitor the amplitude and direction of strain with higher sensitivity and a simpler structure, for the key structures, such as the high-speed running gear.

关键词： RFID Antenna sensor   Light sensitive   Microstrip patch antennas   Nanocomposites  

摘要： In this paper, a passive RFID microstrip antenna photosensor based on titanium dioxide (TiO2)/reduced graphene oxide (rGO)/copper oxide (CuO) nanocomposite was designed and fabricated for monitoring light intensity in the environment. The microstrip patch antenna with slot is designed by HFSS simulation, the actual antenna is prepared by the engraving machine, and the photosensitive RFID sensor is prepared by coating the nano-material on the antenna by drop coating. The amplitude of ambient light intensity is determined in the frequency band of 2.082 GHz-2.087 GHz. To study its performance, the sensor coated with the sensitive material was tested under a solar simulator. The results show that from the dark environment (0 klx)-32.9 klx light intensity, the sensitivity of the photosensor is 0.106 +/- 0.03 db/klx, and the sensitivity is 0.784 +/- 0.08 db/klx under the light intensity of 36.8-53.9 klx. The response time of the photosensor was 20.1 s and the recovery time was 30.3 s in the light intensity range of 0-53.9 klx, indicating that the TiO2/rGO/CuO composite has good responsiveness and repeatability as a photosensitive material.

关键词： Location awareness   Backscatter   Power measurement   Loss measurement   Passive RFID tags   Phase measurement   Wireless communication   Passive backscatter networks   cooperative localization   Cramer-Rao lower bound   non-metric multidimensional scaling (NMDS)   radio-frequency identification (RFID)  

摘要： In fully-connected passive RFID backscatter networks, it is challenging to provide accurate range estimations due to complex channels. Facing this problem, we propose a differential analysis based anti-multipath technique by introducing a reference tag. Through the linear difference between target tag received power measurements with the reference tag activated and not, the power with respect to the reader-reference-target link is separated out from the mixed measurements, achieving the mitigation of multipath and accurately ranging. Under distributed localization schemes, after breaking down the full network into a series of fragments, it is vital but challenging to determine how to assemble them satisfactorily. VIABLE, virtual-actual assembling algorithm, is proposed to achieve distributed and cooperative localization. The virtual assembling phase rectifies the fragments over and over until their errors converge, which enables the mining of a satisfactory and adaptive assembling order. Subsequently, the actual phase assembles the rectified fragments together with that order and accomplishes the overall localization accurately. The theoretical analysis of performance limit is presented via the derivation of Cramer-Rao lower bound approximated by a particle approach. Extensive simulations demonstrate that our proposed framework outperforms existing algorithms for cooperative localization.

关键词： Radiofrequency identification   Sensors   Location awareness   Antenna arrays   Behavioral sciences   Antenna measurements   Trajectory tracking   RFID   sensing   multipath   localization  

摘要： There have been increasing interests in exploring the sensing capabilities of RFID to enable numerous IoT applications, including object localization, trajectory tracking, and human behavior sensing. However, most existing methods rely on the signal measurement either in a low multipath environment, which is unlikely to exist in many practical situations, or with special devices, which increase the operating cost. This paper investigates the possibility of measuring 'multi-path-free' signal information in multipath-prevalent environments simply using a commodity RFID reader. The proposed solution, Clean Physical Information Extraction (CPIX), is universal, accurate, and compatible to standard protocols and devices. CPIX improves RFID sensing quality with near zero cost - it requires no extra device. We implement CPIX and study three major RFID sensing applications: tag localization, device calibration and human behavior sensing. CPIX reduces the localization error by 30% to 50% and achieves the MOST accurate localization by commodity readers compared to existing work. It also significantly improves the quality of device calibration and human behaviour sensing.

关键词： Current sense amplifier (CSA)   low cost   low power   physical unclonable function (PUF)   radio frequency iden-tification technology (RFID)   resistive RAM (RRAM)   security  

摘要： Radio frequency identification technology (RFID) has empowered a wide variety of automation industries, such as logistics and freight transportation. To further promote RFID tags adoption, security, power consumption, and cost have always been issues of general concern. This article presents the first synergy of the RFID tag with embedded resistive RAM (RRAM) array and RRAM-based reconfigurable strong physical unclonable function (R-SPUF). The RRAM not only meets the mass storage and technology downscaling but also renders the ultralow-cost "1-cent RFID tag" more feasible. Moreover, the R-SPUF facilitates multiple initializations until a satisfactory distribution and has strong secure keys benefiting from its reconfigurability that improves both safety and reliability. The complete system operates at 13.56 MHz and is compliant with the ISO14443-A and ISO10373-6 (test) protocols. The RFID tag was fabricated on a 1.1-mm(2) die based on the 0.18-mu m CMOS process. Without resorting to the charge pumps for RRAM read-write operations, the total power consumption is as low as 52.3 mu W, of which the RRAM dissipates 16.2 mu W under a wireless power supply.

关键词： RFID technology   environmental burden   e-waste  

摘要： Radio Frequency Identification (RFID) technology has established itself as an effective tool for identifying various objects in all human and business areas. There are many studies describing the use of this technology. However, scientific articles only marginally address the issue of recycling or reusing radio frequency identifiers. Radio frequency identifiers are defined as electronic waste by European Union legislation. This article deals with the environmental burden resulting from the use of radio frequency identifiers in a selected logistics centre and courier company in the Slovak and Czech Republic territories. The research and its relevance have become topical in the context of pandemics and with the increasing demand for products and courier services. In order to access the level of the above-mentioned environmental burden in a relevant way, an analysis of the circulation of transport units (pallets) and radio frequency identifiers in the selected logistics centre was carried out. The research results showed that the selected logistics centre generated annually 5.7 t of the e-waste from radio frequency identifiers placed on received pallets. The amount of 139 kg of metal was present in the e-waste quantity. The partial results of the research were applied to the e-commerce area. This article's conclusion is dedicated to the characterization of possibilities of reducing the environmental burden from the use of radio frequency identifiers in logistics.