A Novel Radio Frequency Identification (RFID) Dynamic Performance Measurement System Based on Laser Ranging and Humidity Control

Radio frequency identification (RFID) system is susceptible to multiple factors in practical applications such as temperature and metal. Meanwhile, the problems of the effect of humidity on UHF RFID system's performance keep springing up. In this paper, in order to measure RFID system's reading performance, the reading distance of RFID tag is used as an evaluation criterion and the effect of humidity on the dynamic identifying property of the ultra high frequency (UHF) RFID testing platform is emphasized. This paper proposes the theory of the effect of humidity on the reading distance of RFID tags, and obtains some valuable simulation results. A humidity control system is designed to adjust the humidity of the RFID system. The laser ranging sensor is used to measure the reading distance of tags under different humidity. The relationship between the reading distance of the tag and the humidity is established. Comparing experimental data with theoretical simulation results, the results show that the correlation coefficient is 94.06%, and the experimental results are in good agreement with the theory; moreover, the corresponding humidity compensation mechanism is derived to obtain the reading distance of the tag at the same reference humidity. Overall, the paper provides an effective method for selecting and evaluating UHF RFID tags under different humidity.