Highly Sensitive Tactile Shear Sensor Using Spatially Digitized Contact Electrodes

Choi, Eugene; Hwang, Soonhyung; Yoon, Yousang; Seo, Hojun; Lee, Jusin; Yeom, Seongoh; Ryu, Gunwoo; Yang, Haoran; Kim, Sun‐Jin; Sul, Onejae; Lee, Seung Beck

doi:10.3390/s19061300

Cited by 19 publications

(13 citation statements)

References 35 publications

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“…In a typical biomedical application, recognition of shear stresses arising from contacting object slip would be desired rather than knowing the absolute magnitude of shear stress for material identification, thus triggering a motor response to increase grasp strength [ 12 ]. If necessary, the shear force magnitude can be detected through a simple process of increasing the number of CEs [ 30 ]. Since the TIS with a small active sensing area detects pressure level, pressure distribution, and shear forces direction, it may be possible to integrate it on a minimally invasive surgery robot [ 41 ], a prosthetic hand [ 42 ], and even a remote input interface that can be worn on the thumb.…”

Section: Discussionmentioning

confidence: 99%

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Tactile Interaction Sensor with Millimeter Sensing Acuity

Choi

Kim

Gong

et al. 2021

Sensors

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In this article we report on a 3 × 3 mm tactile interaction sensor that is able to simultaneously detect pressure level, pressure distribution, and shear force direction. The sensor consists of multiple mechanical switches under a conducting diaphragm. An external stimulus is measured by the deflection of the diaphragm and the arrangement of mechanical switches, resulting in low noise, high reliability, and high uniformity. Our sensor is able to detect tactile forces as small as ~50 mgf along with the direction of the shear force. It also distinguishes whether there is a normal pressure during slip motion. We also succeed in detecting the contact shape and the contact motion, demonstrating potential applications in robotics and remote input interfaces. Since our sensor has a simple structure and its function depends only on sensor dimensions, not on an active sensing material, in comparison with previous tactile sensors, our sensor shows high uniformity and reliability for an array-type integration.

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Section: Discussionmentioning

confidence: 99%

“…This TIS was designed based on our previous reports utilizing mechanical switches under diaphragm deflection [ 29 , 30 ]. To simultaneously detect shear direction and pressure distribution at millimeter scales, we integrated four pressure sensor units and three shear sensor units on TIS within a 3 × 3 mm area.…”

Section: Device Design and Operating Mechanismmentioning

confidence: 99%

Tactile Interaction Sensor with Millimeter Sensing Acuity

Choi

Kim

Gong

et al. 2021

Sensors

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“…High linearity is advantageous, as it can potentially allow for simplified sensor calibration and minimal signal conditioning requirements for data processing. The scalability is also beneficial to the adoption by other applications, as many previous shear sensor designs were limited in their uses due to low sensing range [6,9,10]. High sensor resolution is important for a variety of uses.…”

Section: A Sensor Performancementioning

confidence: 99%

An Optoelectronics-Based Sensor for Measuring Multi-Axial Shear Stresses

et al. 2021

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There is an increasing need for tactile shear sensors, particularly for medical applications such as orthopedic rehabilitation. Examples include measuring interfacial shear stresses between a residual limb and prosthesis to monitor socket fit and improve residual limb tissue health, and tracking shearing between a foot and shoe for assessing performance in athletes. However, there are considerable challenges in implementing shear force sensors for orthopedic applications due to the requirements for noninvasiveness, low mass, low power, and robustness against motion artifacts, normal force, and/or electromagnetic fields. To address these challenges, we designed, fabricated, and characterized a simple, low-cost, optoelectronic sensor that can measure multi-axial shear stresses. This novel sensor is based on a red, green, and blue (RGB) lightemitting diode (LED) projecting a cyclic illumination of RGB light onto a color pattern surface. As shear strain causes a displacement between the LED and the color pattern, the intensities of the reflected lights change due to the shift of the color pattern position. A photodiode captures the reflected light intensity at each color illumination, allowing the determination of the color pattern surface displacement and the shear along two axes. In this paper, we also report the efficacy of the sensor under benchtop testing conditions, confirming the potential of this technology for shear monitoring in orthopedic devices such as protheses or shoes. Future efforts will focus on miniaturization and packaging of the sensors, and characterizing their performance for the aforementioned medical applications.

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“…Many existing shear sensors are based on capacitive sensing principles [3][4][5][6][7][8][9], which often necessitate bulky packaging and are sensitive to electromagnetic interference from the environment, nearby mechatronic systems, or the human body. For example, Sanders and Daly [4] used metalfoil strain gauges embedded in the wall of a prosthetic socket to measure residual limb-prosthetic socket interfacial shear stresses.…”

Section: Introductionmentioning

confidence: 99%

An Optoelectronics-Based Sensor For Measuring Multi-Axial Shear Stresses

McGeehan¹

2021

Preprint

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Tactile shear force sensors are increasingly popular for medical applications especially for orthopedic rehabilitation such as measuring interfacial shear stresses between a residual limb and prosthetic socket to manage socket fit and residual limb tissue health, or measuring shearing between a foot sole and shoe for assessing performance in athletes. However, there are considerable challenges in implementing shear force sensors for orthopedic applications due to the requirements for noninvasiveness, light weight, low power, and robustness against motion artifacts, normal force, or electromagnetic fields. To address these challenges, this paper describes the design, fabrication, and characterization of a simple, low-cost, optoelectronic sensor that can measure multi-axial shear stresses. The sensor is based on a red, green, and blue (RGB) light-emitting diode (LED) cycling among red, green, and blue lights onto a color pattern surface. As shear strain causes a displacement between the LED and the color pattern, the relative intensities of reflected lights among the different colors change. A photodiode is used to capture the reflected light intensity at each color illumination, allowing the determination of the color pattern surface displacement, and in turn the shear, along two axes. In this paper, the efficacy of the sensor under benchtop testing conditions is reported, confirming the potential of this technology for shear monitoring at orthopedic devices such as protheses or shoes. Future efforts will focus on miniaturization and packaging of the sensors, and characterizing their performance for more medical and other types of applications.

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Highly Sensitive Tactile Shear Sensor Using Spatially Digitized Contact Electrodes

Cited by 19 publications

References 35 publications

Tactile Interaction Sensor with Millimeter Sensing Acuity

Tactile Interaction Sensor with Millimeter Sensing Acuity

An Optoelectronics-Based Sensor for Measuring Multi-Axial Shear Stresses

An Optoelectronics-Based Sensor For Measuring Multi-Axial Shear Stresses

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