DESIGN AND CHARACTERIZATION OF THE LIQUID METAL ANTENNA OPTIMALLY EMBEDDED IN CONCRETE BEAM PROTOTYPE AS AN ALTERNATIVE STRAIN SENSOR

2016 ◽  
Vol 78 (5-9) ◽  
Author(s):  
Edmon O. Fernandez ◽  
Ira Valenzuela ◽  
John William Orillo
Keyword(s):  
Liquid Metal ◽  
Resonant Frequency ◽  
Concrete Beam ◽  
Microfluidic Channel ◽  
Strain Sensor ◽  
Concrete Specimen ◽  
Dipole Antenna ◽  
Loading Tests ◽  
Basic Characteristics ◽  
Metal Antenna

This paper presents the implementation of the novel dipole liquid metal antenna as an alternative strain sensor when embedded in the optimal location of a concrete beam prototype. The antenna is made up of eutectic Indium Gallium, a fluid metal alloy, encased in a microfluidic channel, namely, polydimethylsiloxane (PDMS) elastomer fabricated using McGyver-esque technique to microfabrication. The fluidic dipole antenna being highly flexible, stretchable, and reversibly deformable mimics the basic characteristics of the strain sensor where its resonant frequency is inversely related to its length. The concrete specimen was subjected to center – point loading tests where the resonant frequency of the liquid antenna embedded in it was measured simultaneously. Statistical analysis of the results show that there is a significant relationship between the displacement of the concrete specimen and the resonant frequency of the embedded antenna.

scholarly journals Structural Reinforcement Effect of a Flexible Strain Sensor Integrated with Pneumatic Balloon Actuators for Soft Microrobot Fingers

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 395
Author(s):  
Satoshi Konishi ◽  
Fuminari Mori ◽  
Ayano Shimizu ◽  
Akiya Hirata
Keyword(s):  
Liquid Metal ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Original Performance ◽  
Sensors And Actuators ◽  
Parylene C ◽  
Structural Reinforcement ◽  
Effective Combination ◽  
Metal Strain ◽  
Flexible Strain Sensor

Motion capture of a robot and tactile sensing for a robot require sensors. Strain sensors are used to detect bending deformation of the robot finger and to sense the force from an object. It is important to introduce sensors in effective combination with actuators without affecting the original performance of the robot. We are interested in the improvement of flexible strain sensors integrated into soft microrobot fingers using a pneumatic balloon actuator (PBA). A strain sensor using a microchannel filled with liquid metal was developed for soft PBAs by considering the compatibility of sensors and actuators. Inflatable deformation generated by PBAs, however, was found to affect sensor characteristics. This paper presents structural reinforcement of a liquid metal-based sensor to solve this problem. Parylene C film was deposited into a microchannel to reinforce its structure against the inflatable deformation caused by a PBA. Parylene C deposition into a microchannel suppressed the interference of inflatable deformation. The proposed method enables the effective combination of soft PBAs and a flexible liquid metal strain sensor for use in microrobot fingers.

A Liquid Metal Based Super-Stretchable Strain Sensor

2018 ◽  
Author(s):  
Jing Chen ◽  
Qinwu Gaol ◽  
Jinjie Zhang ◽  
Zhenwen Xie ◽  
Olatunji Mumini Omisore ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Strain Sensor

Liquid metal antenna-based pressure sensor

2019 ◽  
Vol 28 (2) ◽  
pp. 025019
Author(s):  
Xiaoping Zhou ◽  
Yi He ◽  
Jie Zeng
Keyword(s):  
Liquid Metal ◽  
Pressure Sensor ◽  
Metal Antenna

Accurate Formula to Determine Resonant Frequency of Double Sided Printed Dipole Antenna

2017 ◽  
Vol 64 (3) ◽  
pp. 331-336
Author(s):  
R. P. Ghosh ◽  
K. Patra ◽  
B. Gupta ◽  
S. K. Chowdhury
Keyword(s):  
Resonant Frequency ◽  
Dipole Antenna

scholarly journals Microfluidically Frequency-Reconfigurable Quasi-Yagi Dipole Antenna

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2935 ◽  
Author(s):  
Syed Shah ◽  
Sungjoon Lim
Keyword(s):  
Liquid Metal ◽  
High Gain ◽  
Dipole Antenna ◽  
Microfluidic Channels ◽  
Resonant Frequencies ◽  
Continuous Tuning ◽  
Microfluidic Technology ◽  
Peak Gain

In this paper, a frequency reconfigurable quasi-Yagi dipole antenna is proposed by leveraging the properties of microfluidic technology. The proposed antenna comprises a metal-printed driven dipole element and three directors. To tune resonant frequencies, microfluidic channels are integrated into the driven element. To maintain a high gain for all the tuned frequencies, microfluidic channels are also integrated into the directors. Therefore, the length of the driven-element as well as directors can be controlled by injecting liquid metal in the microfluidic channels. The proposed antenna has the capability of tuning the frequency by varying the length of the metal-filled channels, while maintaining a high gain for all the tuned frequencies. The proposed antenna’s performance is experimentally demonstrated after fabrication. The injected amount of liquid metal into the microfluidic channels is controlled using programmable pneumatic micropumps. The prototype exhibits continuous tuning of the resonant frequencies from 1.8 GHz to 2.4 GHz; the measured peak gain of the proposed antenna is varied in the range of 8 dBi to 8.5 dBi. Therefore, continuous tuning with high gain is successfully demonstrated using liquid-metal-filled microfluidic channels.

Pixelated dual‐dipole antenna using electrically actuated liquid metal

2019 ◽  
Vol 55 (19) ◽  
pp. 1032-1034 ◽  
Author(s):  
K.J. Sarabia ◽  
A.T. Ohta ◽  
W.A. Shiroma
Keyword(s):  
Liquid Metal ◽  
Dipole Antenna ◽  
Electrically Actuated
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