Passive RFID Multi-Dimensional sensor for monitoring Light, Humidity, and ethanol

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RFID technology has matured significantly and plays a crucial role in industrial automation. In breweries, precise monitoring and control of environmental data are required at various stages of the brewing process, including humidity, light exposure, and alcohol concentration during fermentation. To facilitate the monitoring of multiple environmental parameters in complex production environments, a passive RFID multidimensional sensor is designed to cater to brewery automation. The sensor is composed of a tri-frequency ELC resonator antenna designed by HFSS simulation. The passive RFID multidimensional sensor operates stably under ambient conditions for light intensity from 9.7 to 39.1 klx, humidity from 20 % to 80 % RH, and ethanol concentration from 0 to 1,800 ppm. In an environment with light intensity between 9.7 and 39.1 klx, the amplitude change is 20 dB, sensitivity is 0.67 dB/klx, and response time is 15.1 ± 0.7 s. In the RH range of 20–80 %, the measured frequency shift is 0.16 GHz, sensitivity is 2 MHz/%RH, and response time is 6.4 ± 0.5 s. For ethanol concentrations between 0 to 1800 ppm, the amplitude change is 17.9 dB, sensitivity is 0.01 dB/ppm, and response time is 25.1 ± 1.2 s. This sensor is economical while boasting zero power consumption, fast response, excellent stability, and good accuracy. It has large potential in multi-parameter monitoring, especially breweries, by offering stable quality and enhancing the production efficiency.