Mutual Capacitive Flexible Tactile Sensor for 3-D Image Control

Wang, Yung-Chen; Chen, Tsun-Yi; Chen, Rongshun; Lo, Cheng‐Yao

doi:10.1109/jmems.2013.2245402

Cited by 35 publications

(5 citation statements)

References 42 publications

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“…As a result, capacitive sensing relies on Δ d , which implies normal force (along the ± z direction) applications; or on Δ A , which implies shear force (in the xy -plane) applications 15 , 16 when some premises are established: under normal and shear force applications, Δ A and Δ d do not appear, respectively. In this study, only Δ A is considered because the application only involves a normal force application (players hold rackets and apply forces vertically to the sensors).…”

Section: Resultsmentioning

confidence: 99%

Wearable and wireless performance evaluation system for sports science with an example in badminton

Zheng

Wang

Chen

et al. 2022

Sci Rep

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Two capacitive sensing units were designed, fabricated, and embedded into two corresponding fingerstalls through microelectronic and additive manufacturing with flexible materials and ergonomic considerations in this study. The sensing units were routed to an adaptor, which in turn was routed to a transmission port (comprising a signal converter and a Bluetooth module), realizing a wearable and wireless force sensing system for sports science applications as the objective. The collected capacitive signals were converted through a preliminarily established database, indicating local force distributions on finger segments. Practical examinations with badminton actions (forehand cross-net shots) were conducted by players to show the effectiveness of the proposed system as an application example. Statistical and quantified results reflected the visual observations on valid shots (67% and 39% for the professional and amateur players, respectively) and well-controlled racket-holding attitude (19.69% and 35.31% force application difference between the first two segments of the index finger of the professional and amateur player, respectively). These proved that the proposed system outperforms existing similar systems in the market and is able to not only classify players with different skill levels but also distinguish attitude stability and controllability, showing scientific evidence in sports science for the first time.

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Section: Resultsmentioning

confidence: 99%

Wearable and wireless performance evaluation system for sports science with an example in badminton

Zheng

Wang

Chen

et al. 2022

Sci Rep

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“…The output characteristic curve of normal force direction is polynomial fitted by the least square method (Figure 11). △C Z can be represented by C 11 , C 12 , C 21 , C 22 according to Equation (19). The fitting curve equation of the least square method is as follows:…”

Section: Experimental Setup 41 Measurement Experiments Of Sensor Norm...mentioning

confidence: 99%

“…Multi-directional force sensors, especially the flexible ones, play an important role in wearable devices [1][2][3][4][5][6], human-related medical sensing [7][8][9][10], and human-machine interfaces [11,12]. In general, the existing tactile sensors can be classified according to the sensing mechanism employed, including piezo technology [13][14][15][16][17], capacitive technology [18,19], optical technology [20], organic sensing technology [21,22], etc. The principle of capacitive tactile sensor is to convert the measured force information into the variation of capacitance, so as to measure the force by detecting the change of capacitance.…”

Section: Introductionmentioning

confidence: 99%

Carbon Black/PDMS Based Flexible Capacitive Tactile Sensor for Multi-Directional Force Sensing

Zhu

Chen

Chu

et al. 2022

Sensors

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Flexible sensing tends to be widely exploited in the process of human–computer interactions of intelligent robots for its contact compliance and environmental adaptability. A novel flexible capacitive tactile sensor was proposed for multi-directional force sensing, which is based on carbon black/polydimethylsiloxane (PDMS) composite dielectric layer and upper and lower electrodes of carbon nanotubes/polydimethylsiloxane (CNTs/PDMS) composite layer. By changing the ratio of carbon black, the dielectric constant of carbon black/PDMS composite layer increases at 4 wt%, and then decreases, which was explained according to the percolation theory of the conductive particles in the polymer matrix. Mathematical model of force and capacitance variance was established, which can be used to predict the value of the applied force. Then, the prototype with carbon black/PDMS composite dielectric layer was fabricated and characterized. SEM observation was conducted and a ratio was introduced in the composites material design. It was concluded that the dielectric constant of carbon sensor can reach 0.1 N within 50 N in normal direction and 0.2 N in 0–10 N in tangential direction with good stability. Finally, the multi-directional force results were obtained. Compared with the individual directional force results, the output capacitance value of multi-directional force was lower, which indicated the amplitude decrease in capacity change in the normal and tangential direction. This might be caused by the deformation distribution in the normal and tangential direction under multi-directional force.

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“…Moreover, Wang et al demonstrated a transparent tactile sensor of higher than 75% transmittance for next generation portable and flexible display [20]. By designing it into finger-type electrodes as shown in figure 2(d), users can achieve 3D image control in figure 2(e).…”

Section: Introductionmentioning

confidence: 99%

Recent advances in flexible force sensors and their applications: a review

Chen¹,

Pancham²,

Mukherjee³

et al. 2022

Flex. Print. Electron.

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In this paper, five sensing mechanisms including capacitive, piezoresistive, inductive, piezoelectric, and optical are reviewed in details with representative literature. Basic functions of normal force, shear force, shear angle, torsional angle, rotational angle; and characteristics in sensitivity, dynamic window, and spatial resolution are discussed and categorized clearly in this article. In addition, materials used in the flexible force sensors for electrodes, substrates, and deformable dielectrics are highlighted and summarized. Furthermore, structural design, specifications of sensitivity, spatial resolution, dynamic range and cyclic life are also unambiguously outlined. Meanwhile, key design considerations are listed and evaluated in this review to indicate major contributions to the characteristics of the flexible force sensors. Notable challenges, potential business, and examples commercial players in the market are listed at the end of this manuscript. This article offers a stepping stone for those who plan to enter the flexible force sensor fields by revisiting the outcomes from the past decades.

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Mutual Capacitive Flexible Tactile Sensor for 3-D Image Control

Cited by 35 publications

References 42 publications

Wearable and wireless performance evaluation system for sports science with an example in badminton

Wearable and wireless performance evaluation system for sports science with an example in badminton

Carbon Black/PDMS Based Flexible Capacitive Tactile Sensor for Multi-Directional Force Sensing

Recent advances in flexible force sensors and their applications: a review

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