On-skin and tele-haptic application of mechanically decoupled taxel array on dynamically moving and soft surfaces

Kwon, Se Young; Park, Gyeongsuk; Jin, Hanbit; Gu, Changyeon; Oh, Sangjun; Sim, Joo Yong; Youm, Wooseup; Kim, Taek‐Soo; Kim, H. J.; Park, Steve

doi:10.1038/s41528-022-00233-0

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…[ 48 ] As an example, the combination of the multiscale microstructural micro‐pyramids with a trapezoid‐shaped mechanical barrier array allows the pressure sensor array to detect the spatiotemporal pressure with negligible mechanical cross‐talk on surfaces of different modulus under dynamic bending. [ 49 ] However, the fabrication process is difficult due to the complex structural design. In another effort, a micro‐cage structure reduces pixel deformation, allowing the pressure sensor to distinguish the tiny weights at a bending radius of ca.…”

Section: Introductionmentioning

confidence: 99%

Bending and Stretching‐Insensitive, Crosstalk‐Free, Flexible Pressure Sensor Arrays for Human‐Machine Interactions

Yuan,

Xu,

Zheng

et al. 2024

Adv Materials Technologies

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Accurate data acquisition from flexible sensors placed on deformable 3D freeform surfaces is of critical importance for many applications, such as wearable electronics, human‐machine interfaces, and soft robotics. However, the mechanical coupling between the sensor and the deformable subject surface to bending and stretching deformations can significantly reduce the accuracy of the acquired data. This study combines a polyimide (PI) micropore isolation layer (PIL) and serpentine electrodes with a flexible piezoresistive sensor to mitigate the issue of mechanical coupling. As a mechanical buffer to distribute the external pressure and reduce the strain concentration, the PIL can avoid the bending interference for bending curvature up to 256 m−1, while maintaining a high sensitivity of S > 21.5 kPa−1. The serpentine electrode design further allows the sensor to reliably acquire data in the presence of stretching up to 45% without cross‐talk. The versatility of the developed sensor is demonstrated in several human‐machine interaction scenarios, including gesture recognition and motion detection. The design strategies on materials and structures from this study can also be applied for the development of other flexible sensors with high sensitivity and low deformation interference to avoid the mechanical coupling between the sensor and the deformable surface.

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Section: Introductionmentioning

confidence: 99%

Bending and Stretching‐Insensitive, Crosstalk‐Free, Flexible Pressure Sensor Arrays for Human‐Machine Interactions

Yuan,

Xu,

Zheng

et al. 2024

Adv Materials Technologies

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“…Tactile skin is indispensable in robotic applications as it enables robots to perceive the location, timing, and manner of interactive contact with other objects [1][2][3][4][5][6][7][8][9] . Numerous tactile sensor designs have been proposed to measure contact on the sensing surface [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Large-area Magnetic Skin for Multi-point and Multi-scale Tactile Sensing with Super-resolution

Zhao,

Hu,

Zhang

et al. 2024

Preprint

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The advancements in tactile sensor technology have found wide-ranging applications in robotic fields, resulting in remarkable achievements in object manipulation and overall human-machine interactions. However, the widespread availability of high-resolution tactile skins remains limited, due to the challenges of incorporating large-sized, robust sensing units and increased wiring complexity. One approach to achieve high-resolution and robust tactile skins is to integrate a limited number of sensor units (taxels) into a flexible surface material and leverage signal processing techniques to achieve super-resolution sensing. Here, we present a magnetic skin consisting of multi-direction magnetized flexible films and a contactless Hall sensor array. The key features of the proposed sensor include the specific magnetization arrangement, K-Nearest Neighbors (KNN) clustering algorithm and convolutional neural network (CNN) model for signal processing. Using only an array of 4*4 taxels, our magnetic skin is capable of achieving super-resolution perception over an area of 44100 mm2, with an average localization error of 1.2 mm. By employing neural network algorithms to decouple the multi-dimensional signals, the skin can achieve multi-point and multi-scale perception. We also demonstrate the promising potentials of the proposed sensor in intelligent control, by simultaneously controlling two vehicles with trajectory mapping on the magnetic skin.

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“…Real‐time temperature monitoring establishes direct communication between the artificial devices and human tissues, realizing efficient signal acquisition for early prediction and diagnosis including cardiovascular diseases, thermal homeostasis, virus infection of COVID‐19, and other syndromes, thereby inspiring an upsurge in healthcare systems, intelligent human‐machine interfaces, and precision medicine. [ 1–4 ] Recent research has highlighted the concept of continuous temperature monitoring via a conformally attachable electronic skin (AES) in contrast to mechanically rigid metallic conductors and non‐portable infrared imaging devices. [ 5–7 ] To this end, the high thermosensitivity induced desirable temperature resolution and mechanical resilience enabling flexibility, primarily for wearable manner, are considered as essential features of AES to overcome the drawbacks of conventionally rigid thermometers.…”

Section: Introductionmentioning

confidence: 99%

A Robust and Adhesive Hydrogel Enables Interfacial Coupling for Continuous Temperature Monitoring

Hao

Dai

et al. 2023

Adv Funct Materials

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Continuous temperature monitoring by flexible hydrogel‐based electronics achieves rapid advances, overcoming the drawbacks of rigid and unportable thermocouples. However, an open question is whether and how the thermosensitive hydrogel designing can prevent mechanical mismatching between devices and skin‐tissues and reduces interfacial failure. Herein, a versatile hydrogel‐based thermistor epidermal sensor (HTES) paradigm is engineered consisting of thermosensitive and self‐adhesive function layer (PEST) in tandem with a surface spraying Ag interdigital electrode. Leveraging the advantage of catechol chemistry inspired tannic acid‐coated cellulose nanocrystals, the resultant PEST achieves the adhesion‐cohesion equilibrium along with superior thermosensitivity. The assembled HTES thereby yields unprecedented features of superior thermosensitivity (TCR = 1.43% °C−1), exceptional mechanical integrity (hammering 200 cycles, current variation <9%), impressive interfacial compatibility (adhesion strength, 25 kPa), and environmental stability (thermosensation retention of 98% over 5 days). By in‐situ microstructure observation, the unique geometrical synchronization of HTES with arbitrary curvilinear surfaces (e.g., sphere, cone, and saddle) stemming from elastic dissipation and discrete rupture of the adhesive fibrillar bridges is validated, affording competitive advantages than that of the state‐of‐the‐art thermistor electronics for alleviating the interfacial deterioration, which dramatically inspires advanced HTES design strategies and paves the way for commercialization of attachable thermistor electronics.

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On-skin and tele-haptic application of mechanically decoupled taxel array on dynamically moving and soft surfaces

Cited by 12 publications

References 34 publications

Bending and Stretching‐Insensitive, Crosstalk‐Free, Flexible Pressure Sensor Arrays for Human‐Machine Interactions

Bending and Stretching‐Insensitive, Crosstalk‐Free, Flexible Pressure Sensor Arrays for Human‐Machine Interactions

Large-area Magnetic Skin for Multi-point and Multi-scale Tactile Sensing with Super-resolution

A Robust and Adhesive Hydrogel Enables Interfacial Coupling for Continuous Temperature Monitoring

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