Thin-film flexible sensor for omnidirectional strain measurements

Żymełka, Daniel; Yamashita, Takahiro; Takamatsu, Seiichi; Itoh, Toshihiro; Kobayashi, Takeshi

doi:10.1016/j.sna.2017.05.040

Cited by 27 publications

(18 citation statements)

References 30 publications

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“…Depending on applications, instead of the most commonly used linear sensing grid, strain sensors can take a form of other diverse geometries. For instance, in our previous studies, we demonstrated an asterisks-shaped strain sensor capable of performing omnidirectional strain analysis [ 25 ]. In contrast to the conventional sensors (with linear sensing grid), the demonstrated omnidirectional strain sensor exhibit almost uniform sensitivity at various installation angles.…”

Section: Introductionmentioning

confidence: 99%

Printed Strain Sensors Based on an Intermittent Conductive Pattern Filled with Resistive Ink Droplets

Żymełka

Yamashita

Sun

et al. 2020

Sensors

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In this study, we demonstrate a strain sensor fabricated as a hybrid structure of a conductive intermittent pattern with embedded single droplets of a functional resistive ink. The main feature of our proposed sensor design is that although the intermittent pattern comprises the majority of the entire sensor area, the strain sensitivity depends almost selectively on the resistive droplets. This opens up the possibility for fast and inexpensive evaluation of sensors manufactured from various functional materials. As the use of resistive ink was limited to single droplets deposition, the required ink amount needed to build a sensor can be considerably reduced. This makes the sensors cost-effective and simple for fabrication. In this study, our proposed sensor design was evaluated when a carbon-based ink was used as the resistive material incorporated into an intermittent structure made of silver. The developed strain sensors were tested during bending deformations demonstrating good strain sensitivity (gauge factor: 7.71) and no hysteresis within the investigated strain range.

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Section: Introductionmentioning

confidence: 99%

Printed Strain Sensors Based on an Intermittent Conductive Pattern Filled with Resistive Ink Droplets

Żymełka

Yamashita

Sun

et al. 2020

Sensors

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“…The sensor array was used on a highway bridge for detecting formation of cracks ( Figure a–c). They used screen printing technique to assemble the sensor array, with a linewidth of 150 µm (Figure d–f) …”

Section: Applications Of Fhementioning

confidence: 99%

A New Frontier of Printed Electronics: Flexible Hybrid Electronics

et al. 2019

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The performance and integration density of silicon integrated circuits (ICs) have progressed at an unprecedented pace in the past 60 years. While silicon ICs thrive at low‐power high‐performance computing, creating flexible and large‐area electronics using silicon remains a challenge. On the other hand, flexible and printed electronics use intrinsically flexible materials and printing techniques to manufacture compliant and large‐area electronics. Nonetheless, flexible electronics are not as efficient as silicon ICs for computation and signal communication. Flexible hybrid electronics (FHE) leverages the strengths of these two dissimilar technologies. It uses flexible and printed electronics where flexibility and scalability are required, i.e., for sensing and actuating, and silicon ICs for computation and communication purposes. Combining flexible electronics and silicon ICs yields a very powerful and versatile technology with a vast range of applications. Here, the fundamental building blocks of an FHE system, printed sensors and circuits, thinned silicon ICs, printed antennas, printed energy harvesting and storage modules, and printed displays, are discussed. Emerging application areas of FHE in wearable health, structural health, industrial, environmental, and agricultural sensing are reviewed. Overall, the recent progress, fabrication, application, and challenges, and an outlook, related to FHE are presented.

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“…The available printing methods and materials allow the fabrication of sensors as well as passive components with their entire wiring systems on various types of lightweight flexible substrates [ 21 ]. Owing to the benefits of printed electronics, printed strain sensors have been studied for various applications [ 22 , 23 , 24 , 25 , 26 ], including SHM [ 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Practical Evaluation of Printed Strain Sensors Based on Long-Term Static Strain Measurements

Żymełka

Togashi²,

Takeshita

et al. 2021

Sensors

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Recent progress in printable electronics has enabled the fabrication of printed strain sensors for diverse applications. These include the monitoring of civil infrastructure, the gradual aging of which raises concerns about its effective maintenance and safety. Therefore, there is a need for automated sensing systems that provide information on the performance and behavior of engineering structures that are subjected to dynamic and static loads. The application of printed strain sensors in structural health monitoring is of growing interest owing to its large-area and cost-effective fabrication process. Previous studies have proven the suitability of printable strain sensors for dynamic strain measurements on bridges; however, the analysis of the long-term stability of printed sensors during static strain measurements is still lacking. Thus, this study aims to assess the long-term stability of printed strain sensor arrays and their suitability for the static strain analysis of large civil structures. The developed sensors and a dedicated wireless data acquisition system were deployed inside a gravity dam, which was selected as the field test environment. This test environment was chosen owing to the relatively stable temperature inside the dam and the very slow static strain changes associated with periodic water level changes. The results exhibited an average signal drift of 20 μϵ over 127 days. One of the sensor arrays was installed on a small crack in the dam structure; it showed that the sensors can track static strain changes owing to variations in the crack opening, which are related to the water level changes in the dam. Overall, the results of the developed sensors exhibit good strain sensitivity and low signal drift. This indicates the potential suitability of printed sensors for applications in the static strain analysis of engineering structures.

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Thin-film flexible sensor for omnidirectional strain measurements

Cited by 27 publications

References 30 publications

Printed Strain Sensors Based on an Intermittent Conductive Pattern Filled with Resistive Ink Droplets

Printed Strain Sensors Based on an Intermittent Conductive Pattern Filled with Resistive Ink Droplets

A New Frontier of Printed Electronics: Flexible Hybrid Electronics

Practical Evaluation of Printed Strain Sensors Based on Long-Term Static Strain Measurements

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