Miniature fiber optic acoustic pressure sensors with air-backed graphene diaphragms

2019 ◽  
Vol 145 (3) ◽  
pp. 1863-1864
Author(s):  
Qian Dong ◽  
Haijun Liu
Keyword(s):  
Acoustic Pressure ◽  
Fiber Optic ◽  
Pressure Sensors

scholarly journals Miniature Fiber Optic Acoustic Pressure Sensors With Air-Backed Graphene Diaphragms

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Qian Dong ◽  
Hyungdae Bae ◽  
Zhijian Zhang ◽  
Yongyao Chen ◽  
Zhongshan Wen ◽  
...  
Keyword(s):  
Acoustic Pressure ◽  
Fiber Optic ◽  
Capillary Tube ◽  
Graphene Film ◽  
Pressure Sensors ◽  
Experimental Results ◽  
Fiber Optic Sensor ◽  
Mechanical Sensitivity ◽  
Sensor Performance ◽  
Silver Composite

Graphene has been known to possess exceptional mechanical properties, including its extremely high Young’s modulus and atomic layer thickness. Although there are several reported fiber optic pressure sensors using graphene film, a key question that is not well understood is how the suspended graphene film interacts with the backing air cavity and affects the sensor performance. Based on our previous analytical model, we will show that the sensor performance suffers due to the significantly reduced mechanical sensitivity by the backing cavity. To remedy this limitation, we will, through experimental and numerical methods, investigate two approaches to enhance the sensitivity of fiber optic acoustic pressure sensors using graphene film. First, a graphene–silver composite diaphragm is used to enhance the optical sensitivity by increasing the reflectivity. Compared with a sensor with pure graphene diaphragm, graphene–silver composite can enhance the sensitivity by threefold, while the mechanical sensitivity is largely unchanged. Second, a fiber optic sensor is developed with enlarged backing air volume through the gap between an optical fiber and a silica capillary tube. Experimental results show that the mechanical sensitivity is increased by 10× from the case where the gap side space is filled. For both approaches, signal-to-noise ratio (SNR) is improved due to the enhanced sensitivity, and comsol Thermoviscous acoustics simulation compares well with the experimental results. This study is expected to not only enhance the understanding of fluid–structural interaction in sensor design but also benefit various applications requiring high-performance miniature acoustic sensors.

scholarly journals Enhanced acoustic pressure sensors based on coherent perfect absorber-laser effect

2021 ◽  
Vol 129 (10) ◽  
pp. 104902
Author(s):  
Mohamed Farhat ◽  
Waqas W. Ahmad ◽  
Abdelkrim Khelif ◽  
Khaled N. Salama ◽  
Ying Wu
Keyword(s):  
Acoustic Pressure ◽  
Pressure Sensors ◽  
Perfect Absorber ◽  
Laser Effect ◽  
Coherent Perfect Absorber

Epoxy-free high-temperature fiber optic pressure sensors for gas turbine engine applications

2004 ◽  
Author(s):  
Juncheng Xu ◽  
Gary Pickrell ◽  
Bing Yu ◽  
Ming Han ◽  
Yizheng Zhu ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Gas Turbine Engine ◽  
Turbine Engine

scholarly journals Manufacturing of Microfluidic Devices with Interchangeable Commercial Fiber Optic Sensors

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7493
Author(s):  
Krystian L. Wlodarczyk ◽  
William N. MacPherson ◽  
Duncan P. Hand ◽  
M. Mercedes Maroto-Valer
Keyword(s):  
Porous Structure ◽  
Steady Flow ◽  
Microfluidic Device ◽  
Fiber Optic ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
Microfluidic Devices ◽  
Fiber Optic Sensors ◽  
Valuable Insight ◽  
Local Pressure

In situ measurements are highly desirable in many microfluidic applications because they enable real-time, local monitoring of physical and chemical parameters, providing valuable insight into microscopic events and processes that occur in microfluidic devices. Unfortunately, the manufacturing of microfluidic devices with integrated sensors can be time-consuming, expensive, and “know-how” demanding. In this article, we describe an easy-to-implement method developed to integrate various “off-the-shelf” fiber optic sensors within microfluidic devices. To demonstrate this, we used commercial pH and pressure sensors (“pH SensorPlugs” and “FOP-MIV”, respectively), which were “reversibly” attached to a glass microfluidic device using custom 3D-printed connectors. The microfluidic device, which serves here as a demonstrator, incorporates a uniform porous structure and was manufactured using a picosecond pulsed laser. The sensors were attached to the inlet and outlet channels of the microfluidic pattern to perform simple experiments, the aim of which was to evaluate the performance of both the connectors and the sensors in a practical microfluidic environment. The bespoke connectors ensured robust and watertight connection, allowing the sensors to be safely disconnected if necessary, without damaging the microfluidic device. The pH SensorPlugs were tested with a pH 7.01 buffer solution. They measured the correct pH values with an accuracy of ±0.05 pH once sufficient contact between the injected fluid and the measuring element (optode) was established. In turn, the FOP-MIV sensors were used to measure local pressure in the inlet and outlet channels during injection and the steady flow of deionized water at different rates. These sensors were calibrated up to 140 mbar and provided pressure measurements with an uncertainty that was less than ±1.5 mbar. Readouts at a rate of 4 Hz allowed us to observe dynamic pressure changes in the device during the displacement of air by water. In the case of steady flow of water, the pressure difference between the two measuring points increased linearly with increasing flow rate, complying with Darcy’s law for incompressible fluids. These data can be used to determine the permeability of the porous structure within the device.

scholarly journals All-Sapphire Fiber-Optic Pressure Sensors for Extreme Harsh Environments

2022 ◽  
Author(s):  
Zhiqiang Shao ◽  
Yalin Wu ◽  
Shuang Wang ◽  
Yan Wang ◽  
Zhiqiang Sun ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Pressure Sensors ◽  
Harsh Environments ◽  
Sapphire Fiber

Sensitivity-variable fiber optic pressure sensors using microbend fiber gratings

2009 ◽  
Vol 282 (23) ◽  
pp. 4532-4536 ◽  
Author(s):  
Hajime Sakata ◽  
Tetsuya Iwazaki
Keyword(s):  
Fiber Optic ◽  
Pressure Sensors ◽  
Fiber Gratings

Investigation of the errors of attenuator-type fiber-optic pressure sensors

2010 ◽  
Vol 53 (9) ◽  
pp. 1029-1036
Author(s):  
A. V. Gorish ◽  
D. A. Kryuchkov ◽  
A. G. Pivkin
Keyword(s):  
Fiber Optic ◽  
Pressure Sensors ◽  
Type Fiber

Micromachined SiC fiber optic pressure sensors for high-temperature aerospace applications

2000 ◽  
Author(s):  
Wade J. Pulliam ◽  
Patrick M. Russler ◽  
Richard Mlcak ◽  
Kent A. Murphy ◽  
Carrie L. Kozikowski
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Aerospace Applications ◽  
Sic Fiber
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