scholarly journals Highly sensitive strain sensor based on helical structure combined with Mach-Zehnder interferometer in multicore fiber

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Hailiang Zhang ◽  
Zhifang Wu ◽  
Perry Ping Shum ◽  
Xuan Quyen Dinh ◽  
Chun Wah Low ◽  
...  
Keyword(s):  
Strain Sensor ◽  
Helical Structure ◽  
Sensitive Strain ◽  
Zehnder Interferometer ◽  
Highly Sensitive ◽  
Multicore Fiber ◽  
Mach Zehnder Interferometer

Highly Sensitive Strain Sensor Based on Helical Structure in Multicore Fiber

2016 ◽  
Author(s):  
Hailiang Zhang ◽  
Zhifang Wu ◽  
Perry Ping Shum ◽  
Xuguang Shao ◽  
Ruoxu Wang ◽  
...  
Keyword(s):  
Strain Sensor ◽  
Helical Structure ◽  
Sensitive Strain ◽  
Highly Sensitive ◽  
Multicore Fiber

scholarly journals Development of Highly Sensitive Strain Sensor Using Area-Arrayed Graphene Nanoribbons

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1701
Author(s):  
Ken Suzuki ◽  
Ryohei Nakagawa ◽  
Qinqiang Zhang ◽  
Hideo Miura
Keyword(s):  
Graphene Nanoribbons ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Sensitive Strain ◽  
Bending Test ◽  
Gauge Factor ◽  
Four Point Bending ◽  
Current Voltage ◽  
Highly Sensitive ◽  
Current Voltage Relationship

In this study, a basic design of area-arrayed graphene nanoribbon (GNR) strain sensors was proposed to realize the next generation of strain sensors. To fabricate the area-arrayed GNRs, a top-down approach was employed, in which GNRs were cut out from a large graphene sheet using an electron beam lithography technique. GNRs with widths of 400 nm, 300 nm, 200 nm, and 50 nm were fabricated, and their current-voltage characteristics were evaluated. The current values of GNRs with widths of 200 nm and above increased linearly with increasing applied voltage, indicating that these GNRs were metallic conductors and a good ohmic junction was formed between graphene and the electrode. There were two types of GNRs with a width of 50 nm, one with a linear current–voltage relationship and the other with a nonlinear one. We evaluated the strain sensitivity of the 50 nm GNR exhibiting metallic conduction by applying a four-point bending test, and found that the gauge factor of this GNR was about 50. Thus, GNRs with a width of about 50 nm can be used to realize a highly sensitive strain sensor.

scholarly journals Highly sensitive vibration sensor based on the dispersion turning point microfiber Mach-Zehnder interferometer

2021 ◽  
Vol 29 (21) ◽  
pp. 32983
Author(s):  
Kaijun Liu ◽  
Junhao Fan ◽  
Binbin Luo ◽  
Xue Zou ◽  
Decao Wu ◽  
...  
Keyword(s):  
Turning Point ◽  
Vibration Sensor ◽  
Zehnder Interferometer ◽  
Highly Sensitive ◽  
Mach Zehnder Interferometer

Largely Deformable and Highly Sensitive Strain Sensor Using Carbon Nanomaterials

2017 ◽  
Author(s):  
Kanji Yumoto ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Aspect Ratio ◽  
Growth Condition ◽  
Electrical Resistance ◽  
Carbon Nanomaterials ◽  
Flexible Substrate ◽  
Strain Sensor ◽  
Sensitive Strain ◽  
Synthesis Process ◽  
Pressure Sensitivity ◽  
Highly Sensitive

A new type tactile sensor with spatial resolution less than 1 mm and the minimum pressure sensitivity less than 10 kPa was proposed by applying MWCNTs (Multi-Walled Carbon Nanotubes). The sensor was embedded into a highly deformable flexible substrate (PDMS: Polydimethylsiloxane) and the obtained gauge factor of the developed sensor was about 5. Since the electronic properties of MWCNTs vary drastically depending on their deformation under mechanical stress, it is important to make appropriate aspect ratio of MWCNTs for improving their stress-sensitivity. The aspect ratio of MWCNTs are mainly dominated by their growth condition such as the average thickness of catalyst layer, growth temperature, pressure of resource gases and so on. Thus, the optimum growth condition was investigated for forming the MWCNTs with high aspect ratio, in other words, high pressure sensitivity. In addition, in this study, the authors fabricated high quality carbon nano-materials to develop highly sensitive strain sensor. A thermal CVD synthesis process of MWCNTs was developed by using acetylene gas. After the synthesis of MWCNTs, flexible isolation material (PDMS) was coated around the grown MWCNT. Then, the interconnection film was deposited by sputtering. After that, PDMS was coated again to fabricate an upper protection layer. Finally, the bottom interconnection layer was sputtered and patterned. The change of the electrical resistance of the grown MWCNTs was measured by applying a compression test in the load range from 0 to 10 mN. It was found that the electrical resistance of the MWCNTs bundle increased almost linearly with the applied compressive load and this sensor showed the high load sensitivity of 10 mN that is higher than human fingers.

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