Resistive and capacitive strain sensors based on customized compliant electrode: Comparison and their wearable applications

Dong, Tianyun; Gu, Yu; Liu, Tao; Pecht, Michael

doi:10.1016/j.sna.2021.112720

Cited by 70 publications

(26 citation statements)

References 28 publications

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“…However, using a hand to manually position the sensor-humerus model to apply pressure against the glenosphere can create inference with the input and output leads creating parasitic capacitive noise. Additionally, a non-structured PDMS dielectric film greatly reduces the sensors response speed [23].…”

Section: Discussionmentioning

confidence: 99%

“…The elasticity of PDMS is dependent upon the mixing ratio of the pre-polymer PDMS and curing agent. By adjusting this mixing ratio the measurement range and sensitivity of the sensor can be tuned to fit a wide range of pressures [23,24]. In short, increasing the pre-polymer to curing agent ratio results in greater deformation of the dielectric medium with the same applied compression resulting in a greater change in capacitance.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, strain gauge performance is significantly dependent on ambient temperatures [22]. In addition, strain gauges have poor static loading stability when compared with capacitive sensors [23]. For these reasons, capacitive sensors appear to be better suited for long-term in vivo joint load monitoring due to their excellent sensitivity, static loading stability, and low temperature drift.…”

Section: Introductionmentioning

confidence: 99%

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Micromachined Tactile Sensor Array for RTSA

2021

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This work presents a polymer-based tactile capacitive sensor capable of measuring joint reaction forces of reverse total shoulder arthroplasty (RTSA). The capacitive sensor contains a polydimethylsiloxane (PDMS) dielectric layer with an array of electrodes. The sensor was designed in such a way that four components of glenohumeral contact forces can be quantified to help ensure proper soft tissue tensioning during the procedure. Fabricated using soft lithography, the sensor has a loading time of approximately 400 ms when a 14.13 kPa load is applied and has a sensitivity of 1.24 × 10−3 pF/kPa at a load of 1649 kPa. A replica RTSA prothesis was 3D printed, and the sensor was mounted inside the humeral cap. Four static right shoulder positions were tested, and the results provided an intuitive graphical description of the pressure distribution across four quadrants of the glenohumeral joint contact surface. It may help clinicians choose a right implant size and offset that best fit a patient’s anatomy and reduce postoperative biomechanical complications such as dislocation and stress fracture of the scapula.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromachined Tactile Sensor Array for RTSA

2021

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“…Another fabrication technique is to mix and create electrode-polymer composites ( Shintake et al, 2018 ; Teixeira et al, 2018 ; Jin et al, 2020 ; Dong et al, 2021 ; Song et al, 2021 ). This popular method can create stretchable electrodes for strain sensors but a long mixing process is required to realize a uniform mixing solution.…”

Section: Introductionmentioning

confidence: 99%

A DIY Fabrication Approach of Stretchable Sensors Using Carbon Nano Tube Powder for Wearable Device

et al. 2021

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Soft robotics and wearable devices are promising technologies due to their flexibility. As human-soft robot interaction technologies advance, the interest in stretchable sensor devices has increased. Currently, the main challenge in developing stretchable sensors is preparing high-quality sensors via a simple and cost-effective method. This study introduces the do-it-yourself (DIY)-approach to fabricate a carbon nanotube (CNT) powder-based stretchable sensor. The fabrication strategy utilizes an automatic brushing machine to pattern CNT powder on the elastomer. The elastomer ingredients are optimized to increase the elastomer compatibility with the brushing method. We found that polydimethylsiloxane-polyethyleneimine (PDMS-PEIE) is 50% more stretchable and 63% stickier than previously reported PDMS 30-1. With these improved elastomer characteristics, PDMS-PEIE/multiwalled CNT (PDMS-PEIE/MWCNT-1) strain sensor can realize a gauge factor of 6.2–8.2 and a responsivity up to 25 ms. To enhance the compatibility of the powder-based stretchable sensor for a wearable device, the sensor is laminated using a thin Ecoflex membrane. Additionally, system integration of the stretchable sensors are demonstrated by embedding it into a cotton-glove and a microcontroller to control a virtual hand. This cost-effective DIY-approach are expected to greatly contribute to the development of wearable devices since the technology is simple, economical, and reliable.

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“…Another fabrication technique is to mix and create electrodepolymer composites (Shintake et al, 2018;Teixeira et al, 2018;Jin et al, 2020;Dong et al, 2021;Song et al, 2021). This popular method can create stretchable electrodes for strain sensors but a long mixing process is required to realize a uniform mixing solution.…”

Section: Introductionmentioning

confidence: 99%

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Resistive and capacitive strain sensors based on customized compliant electrode: Comparison and their wearable applications

Cited by 70 publications

References 28 publications

Micromachined Tactile Sensor Array for RTSA

Micromachined Tactile Sensor Array for RTSA

A DIY Fabrication Approach of Stretchable Sensors Using Carbon Nano Tube Powder for Wearable Device

Video2.MP4

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