Development of Textile-based Pressure Sensor and Its Application

Lim, Seung Ju; Bae, Jong Hyuk; Jang, Sung Jin; Lim, Jee Young; Ko, Jae Hoon

doi:10.1007/s12221-018-8813-8

Cited by 18 publications

(12 citation statements)

References 28 publications

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“…We performed a bench static characterization of the pressure sensor by applying known weights to a single active area when the sensor was stable on a flat surface. This basic characterization confirmed the nonlinear characteristic typical of textile-based piezoresistive sensors, in which the electrical resistance decreases nonlinearly depending on the applied pressure [24][25][26]. We have not characterized the sensor hysteresis, but it is known that the textile-based piezoresistive sensors are affected by this phenomenon; see, for reference, the works reported in [27][28][29].…”

Section: Pressure Mapping Layersupporting

confidence: 73%

Textile-Based Pressure Sensing Matrix for In-Bed Monitoring of Subject Sleeping Posture and Breathing Activity

et al. 2021

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According to current trends in healthcare sensing technologies, we describe a textile-based pressure sensing matrix that can be integrated in the mattress of a smart bed to characterize sleeping posture/movement of a subject and to extract breathing activity. The pressure mapping layer is developed as a matrix of 195 piezoresistive sensors, it is entirely made of textile materials, and it is the basic component of a smart bed that can perform sleep analysis, can extract physiological parameters, and can detect environmental data related to subject’s health. In this paper, we show the principle of the pressure mapping layer and the architecture of the dedicated electronic system that we developed for signal acquisition. In addition, we describe the algorithms for posture/movement classification (dedicated artificial neural network) and for extraction of the breathing rate (frequency domain analysis). We also perform validation of the system to quantify the accuracy/precision of the posture classification and the statistical analysis to compare our breathing rate estimation with the gold standard.

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Section: Pressure Mapping Layersupporting

confidence: 73%

Textile-Based Pressure Sensing Matrix for In-Bed Monitoring of Subject Sleeping Posture and Breathing Activity

et al. 2021

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“…Furthermore, the inherent properties of textile, such as light weight, flexibility, comfort, and breathability, can provide outstanding performance and versatility to the practically integrated device [20][21][22]. Because of these advantages, textile-based sensors have been widely applied to temperature sensors [23], strain sensors [24], and pressure sensors [20,25] to detect mechanical stimuli. Among the textile sensors, textile pressure sensors have been developed into several types depending on the electrical component that changes with the applied force, such as capacitive [26,27], piezoelectric [28], triboelectric [29], and resistive sensors [30,31].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, various materials have been introduced to enhance the performance of textile pressure sensors such as metal nanoparticles [26], graphene [33,34], carbon nanotubes [35], nanowires [36], and poly(3,4-ethylenedioxythiophene) (PEDOT) [25,37]. The most important aspect in the introduction of these materials is that they impart uniform conductivity while maintaining the inherent properties of the textile.…”

Section: Introductionmentioning

confidence: 99%

Foldable and washable fully textile-based pressure sensor

Lim

Bae

Han

et al. 2020

Smart Mater. Struct.

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Smart textiles have wide applications in various sensing systems since they have the advantage of maintaining the inherent properties of textile such as light weight, flexibility, comfort, and breathability. Therefore, textile-based pressure sensors, one of the smart textiles, have attracted considerable interest in wearable electronics and homecare systems. In this study, to construct a textile-based pressure sensor, a poly(3,4-ethylenedioxythiophene) (PEDOT) thin film was fabricated on a polyethylene terephthalate microfiber fabric by vapor phase polymerization with various concentrations of the oxidant, FeCl 3 . The PEDOT conductive textile showed a change in conductivity depending on the applied pressure. We confirmed the excellent washing and physical durability of the sensor from the stable electrical properties of the PEDOT conductive textile after washing and repeated folding tests. Furthermore, a fully textile-based pressure sensor was successfully fabricated using the highly durable PEDOT, which could simultaneously measure both static and dynamic pressures even during physical deformation, thus suggesting great potential in smart textiles, especially textile-based homecare systems.

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“…However, this method will also change the sensitivity of the sensors, so more experiments are needed in future work. In a comparison overview (Figure 8b), our sensors were found to be thinner than those of other studies [33][34][35][36][37][38], though they were a little bit thicker than those of [29] because of the laminating layers. A thin sensor will fit many wearable devices.…”

Section: Electrical Propertiesmentioning

confidence: 48%

Single-Layer Pressure Textile Sensors with Woven Conductive Yarn Circuit

Kim

2020

Applied Sciences

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Today, e-textiles have become a fundamental trend in wearable devices. Fabric pressure sensors, as a part of e-textiles, have also received much interest from many researchers all over the world. However, most of the pressure sensors are made of electronic fibers and composed of many layers, including an intermediate layer for sensing the pressure. This paper proposes the model of a single layer pressure sensor with electrodes and conductive fibers intertwined. The plan dimensions of the fabricated sensors are 14 x 14 mm, and the thickness is 0.4 mm. The whole area of the sensor is the pressure-sensitive point. As expected, results demonstrate an electrical resistance change from 283 Ω at the unload pressure to 158 Ω at the load pressure. Besides, sensors have a fast response time (50 ms) and small hysteresis (5.5%). The hysteresis will increase according to the pressure and loading distance, but the change of sensor loading distance is very small. Moreover, the single-layer pressure sensors also show high durability under many working cycles (20,000 cycles) or washing times (50 times). The single-layer pressure sensor is very thin and more flexible than the multi-layer pressure sensor. The structure of this sensor is also expected to bring great benefits to wearable technology in the future.

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Development of Textile-based Pressure Sensor and Its Application

Cited by 18 publications

References 28 publications

Textile-Based Pressure Sensing Matrix for In-Bed Monitoring of Subject Sleeping Posture and Breathing Activity

Textile-Based Pressure Sensing Matrix for In-Bed Monitoring of Subject Sleeping Posture and Breathing Activity

Foldable and washable fully textile-based pressure sensor

Single-Layer Pressure Textile Sensors with Woven Conductive Yarn Circuit

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