Highly flexible and stretchable optical strain sensing for human motion detection

Guo, Jingjing; Niu, Mengxuan; Yang, Changxi

doi:10.1364/optica.4.001285

Cited by 170 publications

(118 citation statements)

References 20 publications

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“…[33,141,142] Natural fiber-based materials such as cotton, wool, and flax have also been widely used as supporting substrates for the fabrication of stretchable strain sensors. [143][144][145][146][147][148][149][150] Thermoplastic polyurethane (TPU), [28] polystyrene-based elastomers, [38] and PDMS [20,151] are examples of materials used in stretchable optical strain sensors. The appropriate choice of conductive nanomaterials and their interaction with stretchable supporting materials greatly affect the sensing properties of stretchable strain sensors, which will be further discussed in the following sections.…”

Section: Strain Sensing Materialsmentioning

confidence: 99%

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Souri¹,

Banerjee

Jusufi

et al. 2020

Advanced Intelligent Systems

446

289

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Recent advances in the design and implementation of wearable resistive, capacitive, and optical strain sensors are summarized herein. Wearable and stretchable strain sensors have received extensive research interest due to their applications in personalized healthcare, human motion detection, human–machine interfaces, soft robotics, and beyond. The disconnection of overlapped nanomaterials, reversible opening/closing of microcracks in sensing films, and alteration of the tunneling resistance have been successfully adopted to develop high‐performance resistive‐type sensors. On the other hand, the sensing behavior of capacitive‐type and optical strain sensors is largely governed by their geometrical changes under stretching/releasing cycles. The sensor design parameters, including stretchability, sensitivity, linearity, hysteresis, and dynamic durability, are comprehensively discussed. Finally, the promising applications of wearable strain sensors are highlighted in detail. Although considerable progress has been made so far, wearable strain sensors are still in their prototype stage, and several challenges in the manufacturing of integrated and multifunctional strain sensors should be yet tackled.

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Section: Strain Sensing Materialsmentioning

confidence: 99%

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Souri¹,

Banerjee

Jusufi

et al. 2020

Advanced Intelligent Systems

446

289

View full text Add to dashboard Cite

show abstract

“…For example, Guo et al reported a highly flexible and stretchable dye‐doped PDMS optical fiber strain sensor by measuring the absorption changes of the light passing through the fiber. [ 40 ] Leber et al developed a thermoplastic optical fiber sensor for detecting extreme deformations through the wavelength‐dependent changes in light transmission. [ 42 ] Li et al demonstrated a sensitive pressure sensor based on hybrid plasmonic microfiber knot resonator by measuring the shift of resonant peaks.…”

Section: Introductionmentioning

confidence: 99%

Flexible Liquid‐Filled Fiber Adapter Enabled Wearable Optical Sensors

Pan

Jiang

Zhang

et al. 2020

Adv Materials Technologies

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Wearable optical sensors are attracting intensive research interests owing to their advantage of high sensitivity, fast response, and immunity to electromagnetic interferences. However, tunable optical properties and reconfigurable sensor structures remain great challenges for the wearable optical sensors. Herein, flexible liquid‐filled fiber adapters (FLFFAs), which are sensitive to mechanical stimuli, are demonstrated. The novel FLFFA consists of a soft liquid‐filled tubing and two silica optical fibers. The liquid core bestows the FLFFA both tunability and reconfigurability in sensing performance. Deformation of the tubing through bending or pressing results in wavelength‐insensitive changes in light transmission. By measuring the output intensity, the FLFFA based sensors achieve high angle resolution (0.18°) and low detection limit (0.7 mN) for bending and pressure sensing, respectively. The superior sensing properties together with mechanical flexibility and robustness enable real‐time monitoring of finger joint motion, respiration, and wrist pulse. Benefiting from an LED charge‐coupled device (CCD) signal recording system, a 4 × 3 keyboard is realized by simultaneously measuring the output signals of 12 FLFFAs. The FLFFA provides a promising method to detect subtle physiological signals and may find applications in healthcare devices, artificial skins, and sensor networks.

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“…To meet the requirements of these applications, wearable sensors are required to be flexible, stretchable, and biocompatible so that they can stretch, bend, and twist like skin in long‐term wearing. As such, there has been considerable effort in developing various stretchable materials and structures to achieve a range of wearable devices for monitoring temperature, strain, pressure, and so on.…”

Section: Introductionmentioning

confidence: 99%

Stretchable and Temperature‐Sensitive Polymer Optical Fibers for Wearable Health Monitoring

Guo

Zhou

Yang

et al. 2019

Adv Funct Materials

Self Cite

167

157

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Stretchable physical sensors that can detect and quantify human physiological signals such as temperature, are essential to the realization of healthcare devices for biomedical monitoring and human-machine interfaces. Despite recent achievements in stretchable electronic sensors using various conductive materials and structures, the design of stretchable sensors in optics remains a considerable challenge. Here, an optical strategy for the design of stretchable temperature sensors, which can maintain stable performance even under a strain deformation up to 80%, is reported. The optical temperature sensor is fabricated by the incorporation of thermal-sensitive upconversion nanoparticles (UCNPs) in stretchable polymer-based optical fibers (SPOFs). The SPOFs are made from stretchable elastomers and constructed in a step-index core/cladding structure for effective light confinements. The UCNPs, incorporated in the SPOFs, provide thermal-sensitive upconversion emissions at dual wavelengths for ratiometric temperature sensing by near-infrared excitation, while the SPOFs endow the sensor with skin-like mechanical compliance and excellent light-guiding characteristics for laser delivery and emission collection. The broad applications of the proposed sensor in real-time monitoring of the temperature and thermal activities of the human body, providing optical alternatives for wearable health monitoring, are demonstrated.

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Highly flexible and stretchable optical strain sensing for human motion detection

Cited by 170 publications

References 20 publications

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Flexible Liquid‐Filled Fiber Adapter Enabled Wearable Optical Sensors

Stretchable and Temperature‐Sensitive Polymer Optical Fibers for Wearable Health Monitoring

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