Development of A Textile Capacitive Proximity Sensor and Gait Monitoring System for Smart Healthcare

Min, Se Dong; Wang, Changwon; Park, Doo-Soon; Park, Jong Hyuk

doi:10.1007/s10916-018-0928-3

Cited by 18 publications

(5 citation statements)

References 27 publications

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“…It indicates that the longest distance of proximity sensing is about 24 cm and the notable capacitance change could be observed when the distance near than 10 cm. To our best knowledge, the threshold for proximity sensing of 24 cm is superior to most of the reported capacitive pressure sensors [33,[35][36][37]. The electric field lines from the flexible capacitive sensor are disturbed when human body approaches, resulting in reduced capacitance [34].…”

Section: Printed Flexible Pressure Sensor and Its Applicationsmentioning

confidence: 88%

Full printed flexible pressure sensor based on microcapsule controllable structure and composite dielectrics

Mo¹,

Meng²,

Zhao³

et al. 2021

Flex. Print. Electron.

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Flexible pressure sensors have attracted a great deal of attention due to their significant potential for applications in electronic skins, artificial intelligence and wearable health care devices. It is still challenging to obtain the flexible pressure sensor with high sensitivity and large linear measuring range in a low cost and facile way. In this paper, the composite dielectrics ink based on thermal expansion microcapsules (TEMs), silver nanowires (Ag NWs) and polydimethylsiloxane was employed to improve the performance of the flexible capacitive pressure sensor. The screen printing method was used to prepare the electrodes and microstructural composite dielectric layer. The results indicated that the flexible sensor with composite dielectrics of 1 wt.% TEMs and 0.5 wt.% Ag NWs demonstrated the excellent performance including the maximum sensitivity of 2.1 kPa−1 and wide linear pressure range. The dramatic improvement in the sensor’s sensitivity and linear pressure range could be attributed to the synergetic effects of the TEMs controllable microstructure and relative permittivity increase of composite dielectrics under pressure. In addition, the full printed flexible pressure sensor showed its limit of detection of 1.3 Pa, responding time of 50 ms, proximity sensing distance of 24 cm and good mechanical durability over 3600 cyclic compress–release testing. To our best knowledge, these characteristics are superior to the printed capacitive flexible sensor in reporting. In this paper, the full printed flexible pressure sensor demonstrates it is a good candidate to be applied in the field of E-skin, pressure mapping and wearable health care devices, etc.

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Section: Printed Flexible Pressure Sensor and Its Applicationsmentioning

confidence: 88%

Full printed flexible pressure sensor based on microcapsule controllable structure and composite dielectrics

Mo¹,

Meng²,

Zhao³

et al. 2021

Flex. Print. Electron.

View full text Add to dashboard Cite

show abstract

“…Utilizing CPS as wearable sensors offers numerous advantages, such as extending sensor lifespan and reducing production costs by introducing cost-effective rapid manufacturing processes [12][13][14][15][16][17][18][19]. Additionally, CPS exhibits superior sensitivity and lower linear error rates compared to FSR.…”

Section: Introductionmentioning

confidence: 99%

Gait Pattern Analysis: Integration of a Highly Sensitive Flexible Pressure Sensor on a Wireless Instrumented Insole

Das,

Skaf,

Rose

et al. 2024

Sensors

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Gait phase monitoring wearable sensors play a crucial role in assessing both health and athletic performance, offering valuable insights into an individual’s gait pattern. In this study, we introduced a simple and cost-effective capacitive gait sensor manufacturing approach, utilizing a micropatterned polydimethylsiloxane dielectric layer placed between screen-printed silver electrodes. The sensor demonstrated inherent stretchability and durability, even when the electrode was bent at a 45-degree angle, it maintained an electrode resistance of approximately 3 Ω. This feature is particularly advantageous for gait monitoring applications. Furthermore, the fabricated flexible capacitive pressure sensor exhibited higher sensitivity and linearity at both low and high pressure and displayed very good stability. Notably, the sensors demonstrated rapid response and recovery times for both under low and high pressure. To further explore the capabilities of these new sensors, they were successfully tested as insole-type pressure sensors for real-time gait signal monitoring. The sensors displayed a well-balanced combination of sensitivity and response time, making them well-suited for gait analysis. Beyond gait analysis, the proposed sensor holds the potential for a wide range of applications within biomedical, sports, and commercial systems where soft and conformable sensors are preferred.

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“…This information, which can be obtained by means of proximity sensors, is required by a variety of electronic platforms and industrial equipment. As a result, proximity sensors are a critical element in a wide range of systems [1][2][3][4]. The most commonly used technologies to provide proximity detection are optical, ultrasonic, inductive, and capacitive, and are usually based on the measurement of a change in either an electrostatic field, or an electromagnetic field [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Controlled Electromagnetic Field Based Safety System for Handheld Circular Saw

Teixidó¹,

Hinojo

Gómez-Galán

et al. 2022

Sensors

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This paper presents the design of a safety system based on controlled electromagnetic field (CEMF) sensing technology to prevent accidents caused by power tools, especially related to handheld circular saws. The safety system creates an invisible protection bubble of electromagnetic field around the cutting edge. The system can provide early warning or critical warning when a person penetrates the safety bubble. This paper covers how the CEMF technology has been adapted to add value within this application where it needs to coexist with a difficult environment of metallic parts turning thousands of times per minute, strong vibrations, and different ranges of materials to be processed. The proposed contactless solution successfully detects the user, providing enough time for the power tool to totally stop its movement before touching and harming the user. This key property has required a careful optimization of the electromagnetic field generation, the design of a shield circuitry capable of operating properly in a large metal device, and the development of a multi-frame algorithm to address the stringent requirements related to the ability of the system to react to both very fast and very slow events. The feasibility of the system has been validated by a virtual testbench.

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Development of A Textile Capacitive Proximity Sensor and Gait Monitoring System for Smart Healthcare

Cited by 18 publications

References 27 publications

Full printed flexible pressure sensor based on microcapsule controllable structure and composite dielectrics

Full printed flexible pressure sensor based on microcapsule controllable structure and composite dielectrics

Gait Pattern Analysis: Integration of a Highly Sensitive Flexible Pressure Sensor on a Wireless Instrumented Insole

Controlled Electromagnetic Field Based Safety System for Handheld Circular Saw

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