Portable Reflective-Mode Phase-Variation Microwave Sensor Based on a Rat-Race Coupler Pair and Gain/Phase Detector for Dielectric Characterization

Vélez, Paris; Paredes, Ferran; Casacuberta, Pau; Elgeziry, Mahmoud; Su, Lijuan; Muñoz-Enano, Jonathan; Costa, Filippo; Genovesi, Simone; Martín, Ferran

doi:10.1109/jsen.2023.3240771

Cited by 27 publications

(2 citation statements)

References 75 publications

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“…Phase-variation sensors, additionally, are robust against EMI and noise (similar to frequency-variation sensors) and result very attractive for sensing. Nevertheless, retrieving the phase of either the reflection or the transmission coefficient in operational environment (i.e., without the use of a vector network analyzer), in general, is not as simple as inferring the magnitude [70]. Magnitude measurements are more prone to the effects of EMI and noise, but the simplicity of the associated electronics is important in certain applications, in particular, the intended application in this work (the detection of liquid absorption in fabric).…”

Section: Of 12mentioning

confidence: 99%

Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage

Su¹,

Vélez²,

Casacuberta³

et al. 2023

Preprint

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A planar microwave sensor devoted to the detection of humidity in underwear and clothes in general is proposed. The ultimate goal of the sensor is to detect the presence of liquids in fabrics, of interest to aid patients that suffer from certain pathologies, such as hyperhidrosis and enuresis. The main target in the design of the sensor, considering the envisaged application, is simplicity. Thus, the sensor operates at a single frequency, and the working principle is the variation in the mag-nitude of the transmission coefficient of a matched line loaded with an open-ended quar-ter-wavelength sensing stub resonator. The stub, which must be in contact with the so-called fabric under test (FUT), generates a notch in the transmission coefficient with a resonance frequency that depends on the humidity level of the fabric. By designing the stub with a moderately high quality factor, the variation in the resonance frequency causes a significant change in the magnitude level at the operating frequency, the resonance frequency when the sensing stub is loaded with the dry fabric, and the presence of liquid can be detected by means of an amplitude detector. A prototype device is proposed and experimentally validated.

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Section: Of 12mentioning

confidence: 99%

Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage

Su¹,

Vélez²,

Casacuberta³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Phase-variation sensors, additionally, are robust against EMI and noise (similar to frequency-variation sensors) and are very attractive for sensing. Nevertheless, retrieving the phase of either the reflection or the transmission coefficient in the operational environment (i.e., without the use of a vector network analyzer), in general, is not as simple as inferring the magnitude [70]. Magnitude measurements are more prone to the effects of EMI and noise, but the simplicity of the associated electronics is important in certain applications, in particular the intended application in this work (the detection of liquid absorption in fabric).…”

Section: Introductionmentioning

confidence: 99%

Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage

Vélez

Casacuberta

et al. 2023

Electronics

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A planar microwave sensor devoted to the detection of humidity in underwear and clothes in general is proposed. The ultimate goal of the sensor is to detect the presence of liquids in fabrics, which is of interest to aid patients who suffer from certain pathologies, such as hyperhidrosis and enuresis. The main target in the design of the sensor, considering the envisaged application, is simplicity. Thus, the sensor operates at a single frequency, and the working principle is the variation in the magnitude of the transmission coefficient of a matched line loaded with an open-ended quarter-wavelength sensing stub resonator. The stub, which must be in contact with the so-called fabric under test (FUT), generates a notch in the transmission coefficient with a resonance frequency that depends on the humidity level of the fabric. By designing the stub with a moderately high-quality factor, the variation in the resonance frequency causes a significant change in the magnitude level at the operating frequency, which is the resonance frequency when the sensing stub is loaded with the dry fabric, and the presence of liquid can be detected by means of an amplitude detector. A prototype device is proposed and experimentally validated. The measured change in the magnitude level by simply depositing one 50 μL drop of water in the FUT is roughly 25 dB.

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Planar Microwave Sensors

Martín

2024

Lecture Notes in Electrical Engineering

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Portable Reflective-Mode Phase-Variation Microwave Sensor Based on a Rat-Race Coupler Pair and Gain/Phase Detector for Dielectric Characterization

Cited by 27 publications

References 75 publications

Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage

Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage

Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage

Planar Microwave Sensors

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