A Stretchable Radio-Frequency Strain Sensor Using Screen Printing Technology

Jeong, Heijun; Lim, Sungjoon

doi:10.3390/s16111839

Cited by 23 publications

(22 citation statements)

References 26 publications

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“…A large range of fabrication methods for manufacturing conductive trace patterns have been proposed. Most methods rely on the potentially costly fabrication of intermediate tools like screen printing masks [Jeong and Lim 2016;Wessely et al 2016], molds [Huang et al 2017;Sarwar et al 2017] or stencils [Rosset et al 2016]. To circumvent the adhesion issue, specialized plasma chambers are often required to selectively pre-treat the base layer [Jin et al 2017].…”

Section: Related Workmentioning

confidence: 99%

Deformation Capture via Soft and Stretchable Sensor Arrays

et al. 2019

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Fig. 1. Left to right: We propose a method for the fabrication of soft and stretchable silicone based capacitive sensor arrays. The sensor provides dense stretch measurements that, together with a data-driven prior, allow for the capture of surface deformations in real-time and without the need for line-of-sight.We propose a hardware and software pipeline to fabricate flexible wearable sensors and use them to capture deformations without line of sight. Our first contribution is a low-cost fabrication pipeline to embed multiple aligned conductive layers with complex geometries into silicone compounds. Overlapping conductive areas from separate layers form local capacitors that measure dense area changes. Contrary to existing fabrication methods, the proposed technique only requires hardware that is readily available in modern fablabs. While area measurements alone are not enough to reconstruct the full 3D deformation of a surface, they become sufficient when paired with a data-driven prior. A novel semi-automatic tracking algorithm, based on an elastic surface geometry deformation, allows to capture ground-truth data with an optical mocap system, even under heavy occlusions or partially unobservable markers. The resulting dataset is used to train a regressor based on deep neural networks, directly mapping the area readings to global positions of surface vertices. We demonstrate the flexibility and accuracy of the proposed hardware and software in a series of controlled experiments, and design a prototype of wearable wrist, elbow and biceps sensors, which do not require line-of-sight and can be worn below regular clothing.

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Section: Related Workmentioning

confidence: 99%

Deformation Capture via Soft and Stretchable Sensor Arrays

et al. 2019

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“…The design of a stretchable RF strain sensor fabricated using screen printing technology is suggested in [ 78 ]. The proposed sensing device is fabricated using a patch of half of the wavelength, which has a resonant frequency of 3.7 GHz.…”

Section: Screen Printingmentioning

confidence: 99%

Review of Batteryless Wireless Sensors Using Additively Manufactured Microwave Resonators

Memon

Lim

2017

Sensors

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The significant improvements observed in the field of bulk-production of printed microchip technologies in the past decade have allowed the fabrication of microchip printing on numerous materials including organic and flexible substrates. Printed sensors and electronics are of significant interest owing to the fast and low-cost fabrication techniques used in their fabrication. The increasing amount of research and deployment of specially printed electronic sensors in a number of applications demonstrates the immense attention paid by researchers to this topic in the pursuit of achieving wider-scale electronics on different dielectric materials. Although there are many traditional methods for fabricating radio frequency (RF) components, they are time-consuming, expensive, complicated, and require more power for operation than additive fabrication methods. This paper serves as a summary/review of improvements made to the additive printing technologies. The article focuses on three recently developed printing methods for the fabrication of wireless sensors operating at microwave frequencies. The fabrication methods discussed include inkjet printing, three-dimensional (3D) printing, and screen printing.

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“…Low mixing ratio of the filler materials is desired to retain a balance between mechanical and electrical properties of the nanocomposites, which are ideal for stretchable interconnection lines and especially strain sensing applications [18]. PDMS properties are well suitable for the high frequency applications such as radiation based transducers including antennas for strain and temperature sensing purposes [23].…”

Section: Introductionmentioning

confidence: 99%

“…Recently antenna based sensors are developed especially for strain related transductions. Patch antennas are used for such measurements, however they are restricted to only planar surfaces and produce nonlinear response due to their geometry of patch [23][24][25][26]. The non-uniform deformation results in non-linear frequency shift [25].…”

Section: Introductionmentioning

confidence: 99%

Flexible coplanar waveguide strain sensor based on printed silver nanocomposites

et al. 2019

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This paper presents a robust approach towards the design and fabrication of a stretchable coplanar waveguide monopole strain sensor that measures the tensile strain through a linear shift in the resonance frequency unlike the conventional patch antennas strain sensors. The increment in physical length upon application of stretching force on the sensor results into lowering of the resonance frequency, which is correlated with tensile strain. Being a 2d structure, the sensor can easily be deployed on a planar surface to determine the tensile strain. Sensor parameters are optimized through simulations in high frequency structure simulator software. Silver nanowires (AgNWs) based solution is screen printed using a shadow mask on an elastomeric polydimethylsiloxane substrate. The operating frequency of the sensor is 2.49 GHz at ambient condition and it goes down to 2.31 GHz at 6.1% stretching. The simulated sensitivity of the sensor is 0.072 MHz/µm and measured sensitivity of 0.076 MHz/µm has been tested for more than 200 cycles, clearly illustrating the robustness of the proposed approach. These promising results show that this sensor can successfully be implemented for printed wearable applications targeted for monitoring of strain related activities.

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A Stretchable Radio-Frequency Strain Sensor Using Screen Printing Technology

Cited by 23 publications

References 26 publications

Deformation Capture via Soft and Stretchable Sensor Arrays

Deformation Capture via Soft and Stretchable Sensor Arrays

Review of Batteryless Wireless Sensors Using Additively Manufactured Microwave Resonators

Flexible coplanar waveguide strain sensor based on printed silver nanocomposites

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