Textile Sweat Sensor for Underwear Convenience Measurement

Kubiak, Paweł; Leśnikowski, Jacek; Gniotek, K.

doi:10.5604/12303666.1209917

Cited by 6 publications

(8 citation statements)

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“…Flexible humidity sensors fabricated with humidity‐sensitive materials, interdigital electrode parameters, and flexible substrates have a special role in promoting the development of the wearable devices, however, a certain limitations need to be overcome, such as the difficulty to detect the humidity generated from different directions of the human body and the impermeability of the substrate. In this concern, the humidity sensor in a strip shape is incorporated into the textile by weaving, pasting, or sewing to solve the problems mentioned . Recently, suspension coating, drop coating, and spinning coating methods are used to attach humidity sensitive material (poly(vinyl alcohol), polyimide, carbon nanotube, etc.)…”

Section: Introductionmentioning

confidence: 99%

Full‐Textile Wireless Flexible Humidity Sensor for Human Physiological Monitoring

Patil

et al. 2019

Adv Funct Materials

203

172

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Textile-based electronic techniques that can in real-time and noncontact detect the respiration rate and respiratory arrest are highly desired for human health monitoring. Yarn-shaped humidity sensor is fabricated based on a sensitive fiber with relatively high specific surface area and abnormal cross-section. The response and recovery time of the yarnshaped humidity sensor is only 3.5 and 4 s, respectively, with little hysteresis, because of the hydrophobic property of these functional fibers and the grooves on the surface of the fibers, which is much faster than those of the commercial polyimide materials. Moreover, a batteryfree LC wireless testing system combined with the yarn-shaped sensor is fabricated, which is further successfully imbedded into the intelligent mask to detect human breath. Based on the detection of LC wireless testing system, the frequency of 50.25 MHz under the exhaled condition shifts to 50.86 MHz under the inhaled situation of humidity sensor. In essence, the functional yarns with proper structure, would be an excellent candidature to the yarn-shaped humidity sensor, in which there are good performance and wide application possibilities, eventually offering a facile method for the wireless detection of human physiological signals in the field of electronic fabrics.

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Section: Introductionmentioning

confidence: 99%

Full‐Textile Wireless Flexible Humidity Sensor for Human Physiological Monitoring

Patil

et al. 2019

Adv Funct Materials

203

172

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“…Therefore, the characterization of textiles and clothing is a promising field of application for THMS. It has considerable advantages over currently established methods, which are mostly based on resistive measurements and prone to cross sensitivity …”

Section: Discussionmentioning

confidence: 99%

Miniaturized and Thermal‐Based Measurement System to Measure Moisture in Textile Materials

Schönfisch

Göddel

Blinn

et al. 2020

Physica Status Solidi (a)

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Moisture in textile materials worn close to the skin greatly influences our daily comfort. The measurement of moisture in textile materials is therefore of great interest, for example, to determine the amount of perspiration in clothing or car seats, the wound fluid in dressings, or even the urine in diapers or bed linen. All these applications require a robust moisture measurement method, which is harmless to humans and measures in thin layers. One method ideally suited to fit these requirements is the transient‐heat moisture sensing (THMS) method. Herein, a miniaturized and evolved adaption of the THMS method is shown. The measurement system presented herein is optimized for low energy consumption and portability. The working principle of this measuring system is demonstrated by conducting a simple test to investigate the transplanar wicking of eight fundamentally different but garment‐typical textiles. The THMS method and its ability to measure in thin layers that is ideally suited to measure moisture in thin layers are shown. Finally, it lays a foundation to enable a multitude of future applications, wherever moisture (e.g., sweat) is to be measured with high accuracy and with a wearable system close to the human skin.

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“…To determine the amount of liquid moisture in the textile, electrical methods are often used to measure electrical properties like conductivity or permittivity. With regard to wearable applications, however, they can have disadvantages such as electrode degeneration or high cross‐sensitivity, for example, to salinity or to parasitic capacitances and stray‐fields . Thermal‐based measurement methods which are already used in different fields of applications can overcome certain of these disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…With regard to wearable applications, however, they can have disadvantages such as electrode degeneration or high cross-sensitivity, for example, to salinity or to parasitic capacitances and strayfields. [4,5] Thermal-based measurement methods which are already used in different fields of applications can overcome certain of these disadvantages. For example, the electrical cables can be encapsulated and are thus protected against wear or electrical leakage currents.…”

Section: Introductionmentioning

confidence: 99%

New Type of Thermal Moisture Sensor for in‐Textile Measurements

Schönfisch

Göddel

Blinn

et al. 2019

Physica Status Solidi (a)

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The measurement of moisture in textile materials worn on or near the skin can be performed for a variety of reasons, for example, to analyze the amount of perspiration in clothing, wound fluid in bandages or even urine in diapers or bed sheets. Conventional moisture measurement methods, such as electrical resistance or capacitance measurement, can be susceptible to cross sensitivities to electrical fields or ionic impurities, often occurring in measurements close to the human body. The very reliable gravimetric methods are too bulky and difficult to be integrated in portable and online measurements. In this paper, the authors present a “transient heat moisture sensor” (THMS) which is small and comparatively easy to integrate into textiles. The authors describe the measurement principle and present a sensor element manufactured with thin film technologies. The analytical description of the sensor fits to both, experimental data and the result of first numerical analysis (COMSOL Multiphysics). The authors demonstrate how to limit the sensors spatial sensitivity to a thin layer of textile without being influenced by the adjacent environment by proper timing of the signal readout.

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Textile Sweat Sensor for Underwear Convenience Measurement

Cited by 6 publications

References 0 publications

Full‐Textile Wireless Flexible Humidity Sensor for Human Physiological Monitoring

Full‐Textile Wireless Flexible Humidity Sensor for Human Physiological Monitoring

Miniaturized and Thermal‐Based Measurement System to Measure Moisture in Textile Materials

New Type of Thermal Moisture Sensor for in‐Textile Measurements

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