Strain Sensor Based on Mach-Zehnder Interferometers by Waist-enlarged Structure and Spherical Structure

The sp2 rich amorphous carbons have a wide variety of microstructures ranging from flat sheetlike structures such as glassy carbon to highly curved materials having similar local ordering to the fullerenes. These differences are most apparent in the region of the graphite (0002) reflection of the energy filtered diffracted intensity obtained from these materials (Fig. 1). All these materials consist mainly of threefold coordinated atoms. This accounts for their similar appearance above 0.8 Å-1. The fullerene curves (b,c) show a string of peaks at distance scales corresponding to the packing of the large spherical and oblate molecules. The beam damaged C60 (c) shows an evolution to the sp2 amorphous carbons as the spherical structure is destroyed although the (220) reflection in fee fcc at 0.2 Å-1 does not disappear completely. This 0.2 Å-1 peak is present in the 1960 data of Kakinoki et. al. who grew films in a carbon arc under conditions similar to those needed to form fullerene rich soots.

Download Full-text

Development of Flexible Piezoelectric Strain Sensor Array

IEEJ Transactions on Sensors and Micromachines ◽

10.1541/ieejsmas.137.438 ◽

2017 ◽

Vol 137 (12) ◽

pp. 438-443

Author(s):

Takahiro Yamashita ◽

Seiichi Takamatsu ◽

Hironao Okada ◽

Toshihiro Itoh ◽

Takeshi Kobayashi

Keyword(s):

Sensor Array ◽

Strain Sensor ◽

Piezoelectric Strain ◽

Strain Sensor Array

Download Full-text

Development of a smart timber bridge (phase III): moisture and strain sensor investigation for historic covered bridges

10.2737/fpl-gtr-268 ◽

2019 ◽

Author(s):

Brent M. Phares ◽

Trevor L. Pence ◽

James P. Wacker ◽

Travis K. Hosteng

Keyword(s):

Strain Sensor ◽

Phase Iii

Download Full-text

Flexible Metal/Polymer Composite Films Embedded with Silver Nanowires as a Stretchable and Conductive Strain Sensor for Human Motion Monitoring

Micromachines ◽

10.3390/mi10060372 ◽

2019 ◽

Vol 10 (6) ◽

pp. 372 ◽

Cited By ~ 8

Author(s):

Jinjin Luan ◽

Qing Wang ◽

Xu Zheng ◽

Yao Li ◽

Ning Wang

Keyword(s):

Polymer Composite ◽

Silver Nanowires ◽

Composite Films ◽

Strain Sensor ◽

High Sensitivity ◽

Human Motion ◽

Applied Strain ◽

Potential Candidate ◽

Flexible Metal ◽

Metal Polymer

To avoid conductive failure due to the cracks of the metal thin film under external loads for the wearable strain sensor, a stretchable metal/polymer composite film embedded with silver nanowires (AgNWs) was examined as a potential candidate. The combination of Ag film and AgNWs enabled the fabrication of a conductive film that was applied as a high sensitivity strain sensor, with gauge factors of 7.1 under the applied strain of 0–10% and 21.1 under the applied strain of 10–30%. Furthermore, the strain sensor was demonstrated to be highly reversible and remained stable after 1000 bending cycles. These results indicated that the AgNWs could act as elastic conductive bridges across cracks in the metal film to maintain high conductivity under tensile and bending loads. As such, the strain sensor engineered herein was successfully applied in the real-time detection and monitoring of large motions of joints and subtle motions of the mouth.

Download Full-text

Inductive Strain Sensor With High Repeatability and Ultra-Low Hysteresis Based on Mechanical Spring

IEEE Sensors Journal ◽

10.1109/jsen.2020.3010345 ◽

2020 ◽

Vol 20 (24) ◽

pp. 14670-14675

Author(s):

Zhiguang Xing ◽

Jun Lin ◽

David McCoul ◽

Dapeng Zhang ◽

Jianwen Zhao

Keyword(s):

Strain Sensor ◽

Mechanical Spring ◽

High Repeatability

Download Full-text

Superhydrophobic gradient wrinkle strain sensor with ultra-high sensitivity and broad strain range for motion monitoring

Journal of Materials Chemistry A ◽

10.1039/d0ta11959h ◽

2021 ◽

Vol 9 (15) ◽

pp. 9634-9643

Author(s):

Zhenming Chu ◽

Weicheng Jiao ◽

Yifan Huang ◽

Yongting Zheng ◽

Rongguo Wang ◽

...

Keyword(s):

Human Body ◽

Full Range ◽

Strain Sensor ◽

Strain Range ◽

High Sensitivity

A graphene-based gradient wrinkle strain sensor with a broad range and ultra-high sensitivity was fabricated by a simple pre-stretching method. It can be applied to the detection of full-range human body motions.

Download Full-text

High-performance SAWR strain sensor with piston-mode operation

IEEE Sensors Journal ◽

10.1109/jsen.2021.3061562 ◽

2021 ◽

pp. 1-1

Author(s):

Qiang Xiao ◽

Xiaoxin Ma ◽

Weibiao Wang ◽

Yanping Fan ◽

Ping Cai ◽

...

Keyword(s):

High Performance ◽

Strain Sensor ◽

Mode Operation ◽

Piston Mode

Download Full-text

Design of a Sensitive Balloon Sensor for Safe Human–Robot Interaction

Sensors ◽

10.3390/s21062163 ◽

2021 ◽

Vol 21 (6) ◽

pp. 2163

Author(s):

Dongjin Kim ◽

Seungyong Han ◽

Taewi Kim ◽

Changhwan Kim ◽

Doohoe Lee ◽

...

Keyword(s):

High Performance ◽

Strain Sensor ◽

High Sensitivity ◽

Human Robot Interaction ◽

Large Area ◽

Tactile Sensors ◽

Robot Interaction ◽

Mechanical Crack ◽

Flexible Strain Sensor ◽

Contact Sensing

As the safety of a human body is the main priority while interacting with robots, the field of tactile sensors has expanded for acquiring tactile information and ensuring safe human–robot interaction (HRI). Existing lightweight and thin tactile sensors exhibit high performance in detecting their surroundings. However, unexpected collisions caused by malfunctions or sudden external collisions can still cause injuries to rigid robots with thin tactile sensors. In this study, we present a sensitive balloon sensor for contact sensing and alleviating physical collisions over a large area of rigid robots. The balloon sensor is a pressure sensor composed of an inflatable body of low-density polyethylene (LDPE), and a highly sensitive and flexible strain sensor laminated onto it. The mechanical crack-based strain sensor with high sensitivity enables the detection of extremely small changes in the strain of the balloon. Adjusting the geometric parameters of the balloon allows for a large and easily customizable sensing area. The weight of the balloon sensor was approximately 2 g. The sensor is employed with a servo motor and detects a finger or a sheet of rolled paper gently touching it, without being damaged.

Download Full-text

Piezoresistive Characteristics of Nanocarbon Composite Strain Sensor by Its Longitudinal Pattern Design

Applied Sciences ◽

10.3390/app11135760 ◽

2021 ◽

Vol 11 (13) ◽

pp. 5760

Author(s):

Sung-Yong Kim ◽

Baek-Gyu Choi ◽

Gwang-Won Oh ◽

Chan-Jung Kim ◽

Young-Seok Jung ◽

...

Keyword(s):

Axial Load ◽

Filler Content ◽

Factor Model ◽

Strain Sensor ◽

Gauge Factor ◽

Geometric Pattern ◽

Pattern Design ◽

Macro Scale ◽

Composite Strain ◽

Longitudinal Pattern

For an engineering feasibility study, we studied a simple design to improve NCSS (nanocarbon composite strain sensor) sensitivity by using its geometric pattern at a macro scale. We fabricated bulk- and grid-type sensors with different filler content weights (wt.%) and different sensor lengths and investigated their sensitivity characteristics. We also proposed a unit gauge factor model of NCSS to find a correlation between sensor length and its sensitivity. NCSS sensitivity was improved proportional to its length incremental ratio and we were able to achieve better linear and consistent data from the grid type than the bulk type one. We conclude that the longer sensor length results in a larger change of resistance due to its piezoresistive unit summation and that sensor geometric pattern design is one of the important issues for axial load and deformation measurement.

Download Full-text