Parametric design of yarn-based piezoresistive sensors for smart textiles

Huang, Ching‐Tang; Tang, Chien-Fa; Lee, Ming-Chen; Chang, Shuo‐Hung

doi:10.1016/j.sna.2008.06.029

Cited by 60 publications

(46 citation statements)

References 5 publications

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“…From gaming to medical surveillance, a broad spectrum of devices can be conceived. The shear number of research groups presenting their ideas [1][2][3][4][5][6][7][8] supports this fact. Whereas in some cases there is a tendency to move the sensor systems away from the body [9] (because they can be forgotten, used wrongly, etc.…”

Section: Introductionmentioning

confidence: 89%

“…), the link with the body is imperative for monitoring biomedical signals. In the development of smart textiles, two main approaches can be distinguished: the first focuses on the use of textiles as sensors [1,2], the second uses existing sensors and components, that are integrated onto the textile [3][4][5][6]. This last group can be divided into two groups as well.…”

Section: Introductionmentioning

confidence: 99%

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Robust monitoring of vital signs integrated in textile

Jourand

Clercq

Puers

2010

Sensors and Actuators A: Physical

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Robust monitoring of vital signs integrated in textile

Jourand

Clercq

Puers

2010

Sensors and Actuators A: Physical

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“…Hence, sensors can be integrated into textiles at different levels of textile products for health informatics purpose (acquisition, transmission, processing, storing and analysing of health information). The first level covers the fibres [5,6]; the second level deals with the yarns [7][8][9][10] which are manufactured from fibres and the third level is the fabric structures [11][12][13][14][15] which are manufactured through various kinds of fabric forming process such as knitting, weaving, non-woven and braiding. Some successful prototypes have been developed during the last decade for measuring human physiological parameters such as skin temperature [13,16], heart rate [17], breathing rate [18], ECG [19] and blood pressure [20].…”

Section: Introductionmentioning

confidence: 99%

Piezofilm yarn sensor-integrated knitted fabric for healthcare applications

Atalay

Husain

et al. 2016

Journal of Industrial Textiles

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Continuous measurement of cardio-respiratory signals offers various kinds of information valuable for the diagnosis of disease and management of the disease process. The article reports the development of the Piezofilm yarn sensor for healthcare applications, and investigates its performance by monitoring cardio-respiratory signals of human body over an extended period of time. Piezofilm yarn sensor was developed by embedding the thin PVDF strips within the textile yarn. The working mechanism of the Piezofilm yarn sensor is based on voltage generation due to the applied stress. In order to deploy the Piezofilm yarn sensor in the application environment, it was integrated into the knitted textile fabric and then sewn to form belt to be placed at the chest wall and wrist area. The raw signals were acquired through the Piezofilm lab amplifier, National Instrument data acquisition device and SignalExpress software. Fast Fourier Transform analysis was performed to calculate the average cardio-respiratory signal frequencies. Based on Fast Fourier Transform analysis, an additional signalprocessing step was added to eliminate the unwanted mechanical interference and body signals by using an Infinite Impulse Response band pass filter. The Piezofilm yarn sensor embedded sensing fabric was able to measure both respiratory rate and heart beat rate under static and dynamic conditions. The wrist area measurements for heart beat signals were found to be more uniform in comparison to the chest area measurements. Apart from the general healthcare, this sensing fabric could also be used in studies related to biorhythms, sports, detection of sleep apnea and heart problems.

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“…The working principle behind these sensors is the change in electrical resistance due to the external stimuli such as humidity, deformation, temperature and chemicals (7) . There are several methods for the preparation of these sensing materials such as, incorporating metallic fibers in the textile structure or blending of carbon-coated fibers with elastic fibers (8,9) , making structures from conductive polymer-based fibers or conductive polymer-coated fibers (9)(10)(11) or by printing the sensing lines with conductive polymers on the fabrics (12) . Another approach for the preparation of textile stretch sensors is to knit the structures of a highly conductive fibers such as stainless steel (13) but alternatively, they can be made from the coating of traditional fibers or fabric with conductive materials (piezoresistive, piezoelectric and piezocapacitive materials) or from carbon-loaded rubber vulcanized on the elastic textiles (14,15) .…”

Section: Introductionmentioning

confidence: 99%

Stretch sensing properties of conductive knitted structures of PEDOT-coated viscose and polyester yarns

Bashir

Ali

Persson

et al. 2013

Textile Research Journal

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Wearable textile-based stretch sensors, for health-care monitoring, provide physiological and medical evaluation without inhibition in the daily routine life of the patient. In our previous work, we successfully coated viscose and polyester (PES) fibers with conjugated polymer, poly(3,4-ethylenedioxythiophene) (PEDOT) using chemical vapor deposition (CVD) process. In this paper, we have reported the possibility to produce large quantity of PEDOT-coated conductive fibers, which have acceptable mechanical strength and frictional properties so that the knitted stretch-sensors could be produced. By utilizing these knitted structures, we have showed the possibility to produce textile-based monitoring device, which has better integration properties in wearable clothing than metal containing structures. The performance of viscose and polyester knitted structures as stretch sensors was investigated on our own designed cyclic tester. For the imitation of respiratory and joint movement, the variation in electrical properties of knitted structures was examined at 5 to 50% elongations and then the performance of viscose and PES knitted structures was compared on the basis of cyclic testing results. In order to find out the washing effects on PEDOT coatings and the knitted structures, two washing cycles were performed. After washing, the persistence of PEDOT coating on knitted structures was investigated with FT-IR spectroscopy and thermogravimetric analysis. For PES fiber, it was revealed that stretch sensing behavior was still persisted even after the washing cycles. Thus, these structures have the potential to be utilized in medical textiles for monitoring the physiological activities of patients, such as breathing rate and joint movement.

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Parametric design of yarn-based piezoresistive sensors for smart textiles

Cited by 60 publications

References 5 publications

Robust monitoring of vital signs integrated in textile

Robust monitoring of vital signs integrated in textile

Piezofilm yarn sensor-integrated knitted fabric for healthcare applications

Stretch sensing properties of conductive knitted structures of PEDOT-coated viscose and polyester yarns

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