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Sensors 2017, 17(12), 2871; https://doi.org/10.3390/s17122871

A Novel Passive Wireless Sensing Method for Concrete Chloride Ion Concentration Monitoring

1
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
2
School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China
*
Author to whom correspondence should be addressed.
Received: 7 November 2017 / Revised: 7 December 2017 / Accepted: 7 December 2017 / Published: 11 December 2017
(This article belongs to the Special Issue RFID-Based Sensors for IoT Applications)
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Abstract

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. View Full-Text
Keywords: RFID technology; wireless measuring; concrete chloride ion concentration; monitoring RFID technology; wireless measuring; concrete chloride ion concentration; monitoring
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Zhou, S.; Sheng, W.; Deng, F.; Wu, X.; Fu, Z. A Novel Passive Wireless Sensing Method for Concrete Chloride Ion Concentration Monitoring. Sensors 2017, 17, 2871.

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