Novel Conformal RF Tag for Level Detection

Swiefy, Bassant H. El; Sadek, Hala El; Ahmed, Mohamed I.; Anis, Wagdy R.

doi:10.1109/ieeeconf35879.2020.9329939

Cited by 1 publication

(2 citation statements)

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“…Optical [ 14 ] and ultrasound [ 15 ] sensing techniques provide high-resolution liquid-level measurement; however, the optical technique has high manufacturing and maintenance costs as well as health and safety issues, while the ultrasound measurement is mostly erroneous due to its sensitivity to environmental conditions. Microwave resonators [ 16 ], acoustic wave resonators [ 17 ], interdigitated electrodes [ 18 ], and comb electrodes [ 19 ] are other popular techniques for liquid-level measurement; however, they utilize complex digital circuits for signal processing that require additional power to operate, resulting in lower power efficiency, increased cost, and increased design complexity.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some efforts were made to use a chipless RFID technology as a liquid-level detection system with non-linear behavior and a short detection range below 50 cm [ 20 ]. Several other passive RFID-based sensors have been developed that can detect liquid within the container but lack the capability of providing continuous information of the liquid-level variation in real time [ 18 , 21 , 22 ]. Sensing systems based on semi-passive RFID technology have been the focus of many researchers [ 23 , 24 , 25 ], due to their higher read-range as compared to the passive RFID systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wireless Capacitive Liquid-Level Detection Sensor Based on Zero-Power RFID-Sensing Architecture

Ahmad

Khosravi

Iyer

et al. 2022

Sensors

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In this paper, a new method for the wireless detection of liquid level is proposed by integrating a capacitive IDC-sensing element with a passive three-port RFID-sensing architecture. The sensing element transduces changes in the liquid level to corresponding fringe-capacitance variations, which alters the phase of the RFID backscattered signal. Variation in capacitance also changes the resonance magnitude of the sensing element, which is associated with a high phase transition. This change in the reactive phase is used as a sensing parameter by the RFID architecture for liquid-level detection. Practical measurements were conducted in a real-world scenario by placing the sensor at a distance of approximately 2 m (with a maximum range of about 7 m) from the RFID reader. The results show that the sensor node offers a high sensitivity of 2.15∘/mm to the liquid-level variation. Additionally, the sensor can be used within or outside the container for the accurate measurement of conductive- or non-conductive-type liquids due to the use of polyethylene coating on the sensitive element. The proposed sensor increases the reliability of the current level sensors by eliminating the internal power source as well as complex signal-processing circuits, and it offers real-time response, linearity, high sensitivity, and excellent repeatability, which are suitable for widespread deployment of sensor node applications.

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