A highly stretchable optical strain sensor monitoring dynamically large strain for deformation-controllable soft actuator

Yun, Sungryul; Jeong, Jaeyeon; Mun, Seongcheol; Kyung, Ki-Uk

doi:10.1088/1361-665x/ac1f63

Cited by 12 publications

(9 citation statements)

References 47 publications

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“…(g) Illustration of method of fabrication of thermoformed optical fiber embedded within a dielectric elastomer capable of strain measurement. Reproduced with permission from ref ( 126 ). Copyright 2021 IOP Publishing.…”

Section: Sensing Technologies For Soft Roboticsmentioning

confidence: 99%

Sensing in Soft Robotics

Hegde,

Su,

Tan

et al. 2023

ACS Nano

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Soft robotics is an exciting field of science and technology that enables robots to manipulate objects with human-like dexterity. Soft robots can handle delicate objects with care, access remote areas, and offer realistic feedback on their handling performance. However, increased dexterity and mechanical compliance of soft robots come with the need for accurate control of the position and shape of these robots. Therefore, soft robots must be equipped with sensors for better perception of their surroundings, location, force, temperature, shape, and other stimuli for effective usage. This review highlights recent progress in sensing feedback technologies for soft robotic applications. It begins with an introduction to actuation technologies and material selection in soft robotics, followed by an in-depth exploration of various types of sensors, their integration methods, and the benefits of multimodal sensing, signal processing, and control strategies. A short description of current market leaders in soft robotics is also included in the review to illustrate the growing demands of this technology. By examining the latest advancements in sensing feedback technologies for soft robots, this review aims to highlight the potential of soft robotics and inspire innovation in the field.

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Section: Sensing Technologies For Soft Roboticsmentioning

confidence: 99%

Sensing in Soft Robotics

Hegde,

Su,

Tan

et al. 2023

ACS Nano

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“…and some of them have also sensing abilities. In general, the sensing functions were added to the muscle 11 – 13 and therefore few reports about artificial muscles with intrinsic sensing properties 4 , 5 , 14 were presented in scientific literature.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired polypyrrole based fibrillary artificial muscle with actuation and intrinsic sensing capabilities

Beregoi

Beaumont

Evanghelidis

et al. 2022

Sci Rep

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A non-conventional, bioinspired device based on polypyrrole coated electrospun fibrous microstructures, which simultaneously works as artificial muscle and mechanical sensor is reported. Fibrous morphology is preferred due to its high active surface which can improve the actuation/sensing properties, its preparation still being challenging. Thus, a simple fabrication algorithm based on electrospinning, sputtering deposition and electrochemical polymerization produced electroactive aligned ribbon meshes with analogous characteristics as natural muscle fibers. These can simultaneously generate a movement (by applying an electric current/potential) and sense the effort of holding weights (by measuring the potential/current while holding objects up to 21.1 mg). Electroactivity was consisting in a fast bending/curling motion, depending on the fiber strip width. The amplitude of the movement decreases by increasing the load, a behavior similar with natural muscles. Moreover, when different weights were hung on the device, it senses the load modification, demonstrating a sensitivity of about 7 mV/mg for oxidation and − 4 mV/mg for reduction. These results are important since simultaneous actuation and sensitivity are essential for complex activity. Such devices with multiple functionalities can open new possibilities of applications as e.g. smart prosthesis or lifelike robots.

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“…10,11 Plastic optical fibers in a serpentine shape embedded in a polymeric matrix allows the measurement of strains up to 120% with low stress forces. 12 Careful selection of core and cladding materials and co-extrusion of both materials enable the fabrication of a cladded fiber capable of sensing extreme strains up to 300%. 13 Such optical linear sensors have been used for deformation sensing of linear actuators such as McKibben actuators.…”

Section: Introductionmentioning

confidence: 99%

“…These fibers are generally composed of two parts; the core which guides the light and the cladding which surrounds the core and prevents any interference effects. The core can be made from a wide range of materials including fluids, polymers, and plastics. − Using a silicone gel coated with a thin gold coating enables the measurement of strains up to 90% and using a urethane core with silicone cladding enables the measurement of linear strains up to 100%. , Plastic optical fibers in a serpentine shape embedded in a polymeric matrix allows the measurement of strains up to 120% with low stress forces . Careful selection of core and cladding materials and co-extrusion of both materials enable the fabrication of a cladded fiber capable of sensing extreme strains up to 300% .…”

Section: Introductionmentioning

confidence: 99%

Low-Powered and Resilient IR-Based Pigmented Soft Optoelectronic Sensors

Jamil

Rodrigue

2022

ACS Appl. Mater. Interfaces

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Soft optoelectronic sensors capable of multimodal sensing have high repeatability, which makes them an attractive choice for applications requiring deformable sensors. A weakness of these sensors is the constant supply of electrical power input required to pass the light signal through their core, which can lead to excessive power requirements for portable devices. Using an infrared (IR) spectrum signal that requires very low power for signal propagation should help alleviate this issue. However, soft optoelectronic sensors can be easily disturbed by external light sources or even suffer from cross-interference, and IR-based sensors are more susceptible to such interferences since IR wavelengths can penetrate the cladding material generally used in soft optical waveguides. This paper presents a highly stretchable low-powered IR-based soft optoelectronic stretchable sensor with pigmented cladding capable of multimodal sensing. The use of an IR-spectrum signal makes it consume a fraction of the power of what a visible spectrum-based optoelectronic sensor would consume. Pigmented elastomers are used as the cladding of the waveguides of these sensors, which makes them highly resilient. These sensors are embedded in a resilient soft robotic gripper capable of controlling its contact force even with significant external disturbances.

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A highly stretchable optical strain sensor monitoring dynamically large strain for deformation-controllable soft actuator

Cited by 12 publications

References 47 publications

Sensing in Soft Robotics

Sensing in Soft Robotics

Bioinspired polypyrrole based fibrillary artificial muscle with actuation and intrinsic sensing capabilities

Low-Powered and Resilient IR-Based Pigmented Soft Optoelectronic Sensors

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