Stretchable Strain Sensor With Anisotropy and Application for Joint Angle Measurement

Nakamoto, Hiroyuki; Ootaka, Hideo; Tada, Minoru; Hirata, Ichiro; Kobayashi, Futoshi; Kojima, Fumio

doi:10.1109/jsen.2016.2535489

Cited by 42 publications

(26 citation statements)

References 33 publications

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“…The NFCAS is made of soft materials which introduce less dyskinesia. Compared with strain resistive sensors [3,5,9,10], the NFCAS doesn't need any steady fabric to fix the sensor. Thus, the NFCAS works with less discomfort and less extra dyskinesia.…”

Section: Discussionmentioning

confidence: 99%

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Human Limb Motion Detection with Novel Flexible Capacitive Angle Sensor Based on Conductive Textile

Qiu

et al. 2018

Electronics

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In recent years, many sensors made of hard materials have been designed to detect human body movements in physical exercises. However, hard materials usually cause extra dyskinesia for body movements. To detect human limb motion with less dyskinesia in physical exercise, a novel flexible capacitive angle sensor (NFCAS) based on a conductive textile was designed in this paper. The NFCAS has two non-parallel plates, namely, an exciting plate and a sensing plate, which can be fixed onto the inner forearm and the inner upper arm. Thus, the angle between the two plates of the NFCAS can be used to represent the angle of medial elbow, and its variation can lead to changes in the sensor’s capacitance at the same time. A push-ups experiment and pull-ups experiment were conducted to evaluate the designed NFCAS’s performance. Experimental results showed that the NFCAS could detect the main processes of push-ups and pull-ups. Besides high measurement precision, the NFCAS is also soft, thin, lightweight, and easily made. Therefore, it can be widely applied for detecting human limb motion with less dyskinesia in physical exercises.

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Section: Discussionmentioning

confidence: 99%

“…Repeated and intensive motion might change the position of the textile strain resistive sensors, which could decrease the sensors' detection precision. H. Nakamoto et al [10] designed a flexible and stretchable strain capacitive sensor with a sandwiched structure. Flexible sensors are thin, light weight, and elastic.…”

Section: Introductionmentioning

confidence: 99%

Human Limb Motion Detection with Novel Flexible Capacitive Angle Sensor Based on Conductive Textile

Qiu

et al. 2018

Electronics

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“…Conductive patterns can be printed using carbon nano powders [23], carbon nanotubes [24], silver nanoparticles [25] and embedded in stretchable clothes or elastomer layers. Inkjet printed stretchable circuits are very promising for the development of these sensors as they can provide high resolution, less complex fabrication, compatibility with the materials for embeddability.…”

Section: B Soft Suitmentioning

confidence: 99%

A Soft+Rigid Hybrid Exoskeleton Concept in Scissors-Pendulum Mode: A Suit for Human State Sensing and an Exoskeleton for Assistance

Uğurlu

Acer

Barkana

et al. 2019

2019 IEEE 16th International Conference on Rehabilitation Robotics (ICORR)

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In this paper, we present a novel concept that can enable the human aware control of exoskeletons through the integration of a soft suit and a robotic exoskeleton. Unlike the state-of-the-art exoskeleton controllers which mostly rely on lumped human-robot models, the proposed concept makes use of the independent state measurements concerning the human user and the robot. The ability to observe the human state independently is the key factor in this approach. In order to realize such a system from the hardware point of view, we propose a system integration frame that combines a soft suit for human state measurement and a rigid exoskeleton for human assistance. We identify the technological requirements that are necessary for the realization of such a system with a particular emphasis on soft suit integration. We also propose a template model, named scissor pendulum, that may encapsulate the dominant dynamics of the human-robot combined model to synthesize a controller for human state regulation. A series of simulation experiments were conducted to check the controller performance. As a result, satisfactory human state regulation was attained, adequately confirming that the proposed system could potentially improve exoskeleton-aided applications.

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“…This strain sensor is lightweight and features low elasticity, high durability, and good repeatability [23]. The strain sensor we use has been applied to measurements of wrist and elbow motions [24] and rapid prototyping human interfaces [25]. These joints rotate in one or two axes and can be modeled with a simple equation.…”

Section: Introductionmentioning

confidence: 99%

Wearable Lumbar-Motion Monitoring Device with Stretchable Strain Sensors

et al. 2018

Self Cite

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Low-back pain is a common affliction. Epidemiological analyses have reported that periodic cycles of lumbar flexion and rotation are major risk factors for low-back pain. To prevent low-back pain, a lumbar-motion monitoring device could help diagnosticians assess patients’ risk for low-back pain. This study proposes such a device that uses lightweight stretchable strain sensors. Six of these strain sensors form a parallel-sensor mechanism that measures rotation angles of lumbar motion in three axes. The parallel-sensor mechanism calculates rotation angles from the lengths of the strain sensors iteratively. Experimental results reveal that the prototype device is effective for lumbar-motion measurement and significantly improves in terms of wearability over comparable devices.

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Stretchable Strain Sensor With Anisotropy and Application for Joint Angle Measurement

Cited by 42 publications

References 33 publications

Human Limb Motion Detection with Novel Flexible Capacitive Angle Sensor Based on Conductive Textile

Human Limb Motion Detection with Novel Flexible Capacitive Angle Sensor Based on Conductive Textile

A Soft+Rigid Hybrid Exoskeleton Concept in Scissors-Pendulum Mode: A Suit for Human State Sensing and an Exoskeleton for Assistance

Wearable Lumbar-Motion Monitoring Device with Stretchable Strain Sensors

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