Sensing arbitrary contact forces with a flexible porous dielectric elastomer

2021 ◽  
Author(s):  
Baoqing Nie ◽  
Jialei Geng ◽  
Ting Yao ◽  
Yihui Miao ◽  
Yiqiu Zhang ◽  
...  
Keyword(s):  
Dielectric Elastomer ◽  
Contact Forces ◽  
Tactile Sensing ◽  
Next Generation ◽  
Force Measurements ◽  
Flexible Sensors ◽  
Tangential Directions

Artificial tactile sensing in next-generation robots requires the development of flexible sensors for complicated tactile force measurements in both normal and tangential directions.

scholarly journals Hierarchically patterned self-powered sensors for multifunctional tactile sensing

2020 ◽  
Vol 6 (34) ◽  
pp. eabb9083 ◽  
Author(s):  
Yang Wang ◽  
Heting Wu ◽  
Lin Xu ◽  
Hainan Zhang ◽  
Ya Yang ◽  
...  
Keyword(s):  
Low Cost ◽  
Fast Response ◽  
Temperature Sensors ◽  
Physical Contact ◽  
Tactile Sensing ◽  
Material Identification ◽  
Flexible Sensors ◽  
Temperature Stimulus ◽  
Self Powered ◽  
Multifunctional Sensor

Flexible sensors are highly desirable for tactile sensing and wearable devices. Previous researches of smart elements have focused on flexible pressure or temperature sensors. However, realizing material identification remains a challenge. Here, we report a multifunctional sensor composed of hydrophobic films and graphene/polydimethylsiloxane sponges. By engineering and optimizing sponges, the fabricated sensor exhibits a high-pressure sensitivity of >15.22 per kilopascal, a fast response time of <74 millisecond, and a high stability over >3000 cycles. In the case of temperature stimulus, the sensor exhibits a temperature-sensing resolution of 1 kelvin via the thermoelectric effect. The sensor can generate output voltage signals after physical contact with different flat materials based on contact-induced electrification. The corresponding signals can be, in turn, used to infer material properties. This multifunctional sensor is excellent in its low cost and material identification, which provides a design concept for meeting the challenges in functional electronics.

scholarly journals Organic field-effect transistor-based flexible sensors

2020 ◽  
Vol 49 (11) ◽  
pp. 3423-3460 ◽  
Author(s):  
Saravanan Yuvaraja ◽  
Ali Nawaz ◽  
Qian Liu ◽  
Deepak Dubal ◽  
Sandeep G. Surya ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Optoelectronic Properties ◽  
Next Generation ◽  
Organic Field Effect Transistor ◽  
Flexible Sensors ◽  
Multiparametric Analysis ◽  
Sensing Technology ◽  
Effect Transistor ◽  
Reduced Complexity

Flexible transistors are the next generation sensing technology, due to multiparametric analysis, reduced complexity, biocompatibility, lightweight with tunable optoelectronic properties. We summarize multitude of applications realized with OFETs.

Expanding the Horizons of Wireless Sensing

2022 ◽  
Vol 25 (3) ◽  
pp. 38-42
Author(s):  
Agrim Gupta ◽  
Cédric Girerd ◽  
Manideep Dunna ◽  
Qiming Zhang ◽  
Raghav Subbaraman ◽  
...  
Keyword(s):  
Force Sensor ◽  
Physical World ◽  
Contact Forces ◽  
Force Sensors ◽  
Force Measurements ◽  
Tissue Phantom ◽  
Ubiquitous Sensing ◽  
Sensing Applications ◽  
Communication Paradigm ◽  
Critical Requirement

All interactions of objects, humans, and machines with the physical world are via contact forces. For instance, objects placed on a table exert their gravitational forces, and the contact interactions via our hands/feet are guided by the sense of contact force felt by our skin. Thus, the ability to sense the contact forces can allow us to measure all these ubiquitous interactions, enabling a myriad of applications. Furthermore, force sensors are a critical requirement for safer surgeries, which require measuring complex contact forces experienced as a surgical instrument interacts with the surrounding tissues during the surgical procedure. However, with currently available discrete point-force sensors, which require a battery to sense the forces and communicate the readings wirelessly, these ubiquitous sensing and surgical sensing applications are not practical. This motivates the development of new force sensors that can sense, and communicate wirelessly without consuming significant power to enable a battery-free design. In this magazine article, we present WiForce, a low-power wireless force sensor utilizing a joint sensing-communication paradigm. That is, instead of having separate sensing and communication blocks, WiForce directly transduces the force measurements onto variations in wireless signals reflecting WiForce from the sensor. This novel trans-duction mechanism also allows WiForce to generalize easily to a length continuum, where we can detect as well as localize forces acting on the continuum. We fabricate and test our sensor prototype in different scenarios, including testing beneath a tissue phantom, and obtain sub-N sensing and sub-mm localizing accuracies (0.34 N and 0.6 mm, respectively).

Environment stable ionic Organohydrogels as Self-Powered Integrated System for wearable electronics

2021 ◽  
Author(s):  
Jianren Huang ◽  
Jianfeng Gu ◽  
Jiaontao Liu ◽  
Jinquan Guo ◽  
Huiyong Liu ◽  
...  
Keyword(s):  
Integrated System ◽  
Wearable Electronics ◽  
Next Generation ◽  
Flexible Sensors ◽  
Self Powered

Intelligent flexible sensors with comfort and self-powered properties are primary in next-generation wearable electronics. Nevertheless, most of the current flexible sensors can’t work independently, but have to rely on external...

A Comparison Among Low Temperature Piezoelectric Flexible Sensors Based on Polysilicon TFTs for Advanced Tactile Sensing on Plastic

2016 ◽  
Vol 12 (3) ◽  
pp. 209-213 ◽  
Author(s):  
Luca Maiolo ◽  
Francesco Maita ◽  
Alessandro Pecora ◽  
Antonio Minotti ◽  
Guglielmo Fortunato ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tactile Sensing ◽  
Flexible Sensors

scholarly journals Modern Facilities for Experimental Measurement of Dynamic Loads Induced by Humans: A Literature Review

2013 ◽  
Vol 20 (1) ◽  
pp. 53-67 ◽  
Author(s):  
Vitomir Racic ◽  
Aleksandar Pavic ◽  
James Mark William Brownjohn
Keyword(s):  
Motion Tracking ◽  
Inertial Sensors ◽  
Force Plate ◽  
Contact Forces ◽  
Tracking Systems ◽  
Force Measurements ◽  
Foot Pressure ◽  
Engineering Structures ◽  
Optical Motion ◽  
Optical Motion Tracking

This paper provides a critical overview of available technology and facilities for determining human-induced dynamic forces of civil engineering structures, such as due to walking, running, jumping and bouncing. In addition to traditional equipment for direct force measurements comprising force plate(s), foot pressure insoles and instrumented treadmills, the review also investigates possibility of using optical motion tracking systems (marker-based and marker-free optoelectronic technology) and non-optical motion tracking systems (inertial sensors) to reproduce contact forces between humans and structures based on body kinematics data and known body mass distribution. Although significant technological advancements have been made in the last decade, the literature survey showed that the state-of-the-art force measurements are often limited to individuals in artificial laboratory environments. Experimental identification of seriously needed group- and crowd-induced force data recorded on as-built structures, such as footbridges, grandstands and floors, still remains a challenge due to the complexity of human actions and the lack of adequate equipment.

Disulfide bonds and Diel-Alder Reaction Bonds Hybrid Polymers with High Stretchability, Transparency, Recyclability, and Intrinsic Dual-Healability for Skin-like Tactile Sensing

2020 ◽  
Author(s):  
Chun-Ming Yeh ◽  
Chun-Hsiu Lin ◽  
Tzung-You Han ◽  
Yu-Ting Xiao ◽  
Yi-An Chen ◽  
...  
Keyword(s):  
Human Skin ◽  
Disulfide Bonds ◽  
Alder Reaction ◽  
Tactile Sensing ◽  
Next Generation ◽  
Hybrid Polymers ◽  
Electronic Skin

Mimicking the nature of human skin and have additional features by developing the skin-inspired materials and devices for electronic skin (e-skin) applications is crucial to the next generation electronics. However,...

Dielectric elastomer vibrissal system for active tactile sensing

2012 ◽  
Author(s):  
Andrew T. Conn ◽  
Martin J. Pearson ◽  
Anthony G. Pipe ◽  
Jason Welsby ◽  
Jonathan Rossiter
Keyword(s):  
Dielectric Elastomer ◽  
Tactile Sensing ◽  
Vibrissal System
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