Journal
SENSORS
Volume 17, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/s17122871
Keywords
RFID technology; wireless measuring; concrete chloride ion concentration; monitoring
Funding
- Natural Science Foundation of China [51662008, 51767006]
- Natural Science Foundation of Jiangxi Province [20171BAB206045]
- Science and Technology Project of Education Department of Jiangxi Province [GJJ160491]
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In this paper, a novel approach for concrete chloride ion concentration measuring based on passive and wireless sensor tag is proposed. The chloride ion sensor based on RFID communication protocol is consisting of an energy harvesting and management circuit, a low dropout voltage regulator, a MCU, a RFID tag chip and a pair of electrodes. The proposed sensor harvests energy radiated by the RFID reader to power its circuitry. To improve the stability of power supply, a three-stage boost rectifier is customized to rectify the harvested power into dc power and step-up the voltage. Since the measured data is wirelessly transmitted, it contains miscellaneous noises which would decrease the accuracy of measuring. Thus, in this paper, the wavelet denoising method is adopted to denoise the raw data. Besides, a monitoring software is developed to display the measurement results in real-time. The measurement results indicate that the proposed passive sensor tag can achieve a reliable communication distance of 16.3 m and can reliably measure the chloride ion concentration in concrete.
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