Passive RFID-Based Diaper Moisture Sensor

Tajin, Abu Saleh; Mongan, William M.; Dandekar, Kapil R.

doi:10.1109/jsen.2020.3021395

Cited by 39 publications

(24 citation statements)

References 17 publications

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“…Although the proposed design of the diaper moisture sensor [10] contains a reference tag, we only showed the main tag in this emulation work. It is possible to generate a large number of data sets under different channel conditions in a very short time, which would not be possible with realworld experiments.…”

Section: G Recommendations and Discussionmentioning

confidence: 99%

“…We have also developed a passive UHF RFID smart diaper moisture sensor (Fig. 2) [10] at DWSL. The fundamental working principle of the sensor is that the radiation efficiency of a dipole antenna (predominately used by commercially available RFID tags) is significantly reduced in the proximity of water.…”

Section: B Uhf Passive Rfid Diaper Moisture Sensormentioning

confidence: 99%

“…As a result, there is a sharp drop in RSSI observed at the reader end. From experimental results, we find that the tag radiation efficiency drops by 15 dB as the diaper goes from a dry to wet state [10]. In the final form of both sensors, we use a reference tag to maintain signal reliability by eliminating false-positive results.…”

Section: B Uhf Passive Rfid Diaper Moisture Sensormentioning

confidence: 99%

“…Simulated antenna parameters and wireless environment models are exported into an electromagnetic ray-tracing software, which in turn provides Line-of-Sight (LOS) and non-LOS power, phase, and delay profile. The aforementioned values are used to [10] .…”

Section: Introductionmentioning

confidence: 99%

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UHF RFID Channel Emulation Testbed for Wireless IoT Systems

et al. 2021

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We propose an ultra high frequency (UHF) radio frequency identification (RFID, MHz in the US) channel emulation testbed that is capable of simultaneously emulating unique wireless channels. The proposed system can potentially be an invaluable tool in the design and validation of RFIDbased Internet of Things (IoT) sensors and systems. Emulation of ray-tracing-based wireless channels enables the evaluation of inherently difficult and complex radio frequency (RF) scenarios, particularly in situations when in-person experimentation is not feasible or desirable (e.g., during a pandemic or in a critical care facility). Furthermore, the emulation testbed is able to generate a large amount of sensor data in a limited time period. Machine learning techniques used in wireless IoT can be greatly enhanced by a large amount of data extracted from the emulation of dynamic and challenging environments. The proposed multi-channel emulation testbed is therefore a valuable solution for experimentation on real hardware and a convenient tool for pre-clinical-trial system validation.INDEX TERMS Internet of Things (IoT), passive sensors, Radio Frequency Identification (RFID), Ultra High Frequency (UHF), Wireless channel emulation,

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Section: G Recommendations and Discussionmentioning

confidence: 99%

Section: B Uhf Passive Rfid Diaper Moisture Sensormentioning

confidence: 99%

Section: B Uhf Passive Rfid Diaper Moisture Sensormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UHF RFID Channel Emulation Testbed for Wireless IoT Systems

et al. 2021

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“…The ability to interrogate a varying number of tags and reconstruct information about their surroundings has enabled a variety of applications. For example, localization [3], electricity metering [4], moisture sensing [5]- [7], mechanical deformation sensing [8], structural monitoring [9], in addition to fluids characterization [10] are among the various applications of RFID-based sensing. With UHF RFID readers becoming ubiquitous in various domains, RFID sensing can be considered a low-cost and low-maintenance approach to battery-less wireless sensing.…”

Section: Introductionmentioning

confidence: 99%

Wireless Ice Detection and Monitoring Using Flexible UHF RFID Tags

Wagih

Shi

2021

IEEE Sensors J.

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Owing to its low relative permittivity, very few microwave sensors have been developed for monitoring ice deposition. This paper presents the first use of UHF RFID tags for wireless RF ice sensing applications. Despite its low permittivity, the existence of ice as a superstrate on a planar ultra-thin dipole antenna can lower the resonance frequency of the antenna significantly. The RFID tags, having a measured unloaded range of 9.4 m, were evaluated for remotely detecting the formation of ice in various scenarios up to 10 m from the reader, as well as monitoring the ice thawing, based on the Relative Signal Strength (RSS) in a phase-free approach. In most RSS-based sensing approaches, the tag's read-range is reduced as the RSS decreases in response to the stimulant. However, the proposed sensing mechanism does not reduce the tag's range; the ice superstrate improves the impedance matching of the tags and increases their radar cross section (RCS), resulting in a 10 m loaded read-range with over 12 dB ice-sensitivity, in an echoic multi-path environment. The proposed sensing mechanism achieves an accuracy of 86% for tags positioned between 0.5 and 10.5 m with various obstructions. When subjected to line-of-sight metallic obstruction, the sensor still maintains 80% accuracy. The long range and high sensitivity of the proposed sensing mechanics show that UHF RFID is a promising method for detecting the formation of ice in future smart cities.

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