Donghua Wang

A Novel Temperature Control System of Measuring the Dynamic UHF RFID Reading Performance

The influence of temperature on the dynamical read performance of tags is presented in this paper. A RFID detection system including a temperature control is devised to simulate the influence of temperature on the dynamic reading performance of UHF RFID system. The reading distance of a RFID tag is measured at different temperature. The result shows that the reading distance of RFID tag reduces with the increase of test temperature. This paper provides an effective method for selection and evaluation of UHF RFID tags at different temperature.

Influence of Temperature on the Dynamic Reading Performance of UHF RFID System: Theory and Experimentation

The radio frequency identification (RFID) system is vulnerable to a variety of factors (metal, liquid, temperature, and so on) in the practical application. In this paper, the reading distance of tags, as the evaluation criteria for the reading performance of the RFID system, is focused on to study the influence of environmental temperature on the dynamical performance of an ultra-high frequency (UHF) RFID system. An experimentation system, including temperature control system and detection platform, is devised to control temperature and measure the reading distance of the RFID tag. According to the experimental data of the tags reading distance at different temperature, a fitting model between temperature and tags reading distance is established. Experimental results show that the tags reading distance decreases with the increase of temperature. Finally, the corresponding temperature compensation mechanism is deduced to get the reading distance under the same reference temperature. This paper provides an effective method for selection and evaluation of UHF RFID tags at different temperature.

Online Measurement of Alcohol Concentration Based on Radio-Frequency Identification

This paper presents a method for online measuring signal backscattering and reading distance from radio frequency identification (RFID) tags attached to the surface of the liquid, and for calculating the corresponding alcohol concentration. We derive a theoretical formula on the reading distance and received power. Subsequently, the former measurement values are converted to the corresponding alcohol concentration. Experiments are performed using an ISO/IEC 18046-based measurement system in the ultra high frequency (UHF) RFID band [ISO/IEC 18046, “Information Technology—Radio Frequency Identification Device Performance Test Methods,” International Organization for Standardization, London, 2007]. A fitted model of the relationship of alcohol concentration, reading distances, and received power is established. Based on the proposed fitted model, the processor can calculate alcohol concentration in aqueous solutions. The experimental data are compliant to the theoretical counterparts. This online method could be applied to dynamic measurement in automatic assembly line and has the advantages of excellent versatility, high measuring accuracy, stable performance, and quick response speed.

Design for two-dimensional barcode dynamic recognition system in the environment of large-scale logistics

Two-dimensional (2-D) barcode, which takes advantage of codes in both horizontal and vertical directions to carry information, is developed from the traditional one-dimensional (1-D) barcode. In this paper, based on the requirement of large-scale logistics environment, a 2-D barcode dynamic recognition system is developed which is capable of detecting and reading 2-D barcodes in motion. To evaluate and recognize 2-D barcodes in motion, the relation function of digital image gray value and physical reflectance is basically established. Furthermore, for practical purpose, a 2-D barcode positioning software is built to rotate 2-D barcodes in images. Besides, the symbol contrast and the modulation ratio of a single QR code are calculated. This paper provides a basic effective way to acquire the quality of barcode in images.

Dynamic Testing for RFID Based on Photoelectric Sensing in Internet of Vehicles

With the development of application scale of radio frequency identification (RFID) technology in Internet of vehicles (IOV), the scenarios of multi-reader and multi-tag have become increasingly common. Firstly, the relationship between IOV and RFID technology is presented in this paper. Moreover, key of electronic vehicle identification (EVI) is presented, which is the main application of RFID in IOV. Finally, the novel semi-physical verification system based on photoelectric sensing is introduced for dynamic testing of RFID in EVI. The experimental results show that the testing method as well as system is applicable not only for reading range test of single-tag scenario, but also for anti-collision test of multi-tag scenario. The proposed method has good characteristics in terms of speed and accuracy. Thus, the research of this paper is very useful for testing of EVI RFID system performance in a variety of harsh environments.

Optimal Analysis and Semi-physical Verification of Geometric Distribution of RFID Multi-tag Based on Fisher Matrix

Through the research in the former chapter, the dynamic performance of IOT system with RFID as the core sensor is affected by the multi-tag distribution. At present, software collision avoidance is mostly adopted in the domestic and international researches. The reading efficiency, reading distance and reading speed of multi-tag IOT system dynamic performance not only depends on the measurement accuracy and positioning algorithm, but also with the multi-tag relative positioning target to be closely related to the geometric distribution.

Influence of Temperature on the Dynamic Reading Performance of UHF RFID System: Thermodynamic Analysis and Semi-physical Verification

The main interference factors affecting the communication channel are electromagnetic waves, metals, liquids, temperature and so on.

Multi-antenna Optimal Reception Theory and Semi-physical Verification for RFID-MIMO System

The basis of semi-physical simulation is mathematical model. As a typical IOT application system, the channel model of RFID multi-tag multi reader system is the basis of its semi-physical simulation.

Application of Semi-physical Verification Technology in Other Areas of IOT

The above chapters focus on the semi-physical verification technology in the field of RFID system. With the continuous development of technology, the semi-physical verification technology is not only widely used in the field of RFID system, but also promoted in other fields, such as internet of vehicles (IOV), navigation and structural health monitoring.

Research Progress of Semi-physical Verification Technology Based on Photoelectric Sensing

Simulation verification technology is a kind of professional technology which integrates information processing, similarity theory and system integration. It uses computers and all kinds of physical equipments as bridge, mathematical model and physical model as means to make modeling and simulation of the system.