Su, L.; Vélez, P.; Casacuberta, P.; Muñoz-Enano, J.; Martín, F. Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage. Electronics2023, 12, 2276.
Su, L.; Vélez, P.; Casacuberta, P.; Muñoz-Enano, J.; Martín, F. Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage. Electronics 2023, 12, 2276.
Su, L.; Vélez, P.; Casacuberta, P.; Muñoz-Enano, J.; Martín, F. Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage. Electronics2023, 12, 2276.
Su, L.; Vélez, P.; Casacuberta, P.; Muñoz-Enano, J.; Martín, F. Microwave Humidity Sensor for Early Detection of Sweat and Urine Leakage. Electronics 2023, 12, 2276.
Abstract
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.
Keywords
planar microwave sensor; humidity sensor; microstrip technology; detection of sweat; detection of urine leakage; enuresis; hyperhidrosis
Subject
Engineering, Electrical and Electronic Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
