Miniature Fiber Optic Acoustic Pressure Sensors With Air-Backed Graphene Diaphragms.
Qian Dong,Hyungdae Bae,Zhijian Zhang,Yongyao Chen,Zhongshan Wen,Douglas A. Olson,Miao Yu,Haijun Liu +7 more
TLDR
Two approaches are investigated to enhance the sensitivity of fiber optic acoustic pressure sensors using graphene film, and signal-to-noise ratio (SNR) is improved due to the enhanced sensitivity, and COMSOL Thermoviscous acoustics simulation compares well with the experimental results.Abstract:
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.read more
Citations
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A Review on the Applications of Graphene in Mechanical Transduction.
Alexandre F. Carvalho,Bohdan Kulyk,António J. S. Fernandes,Elvira Fortunato,Florinda M. Costa +4 more
TL;DR: The applications of graphene in mechanical transduction are reviewed in this paper, where an overview of sensor and actuator applications is provided, covering different transduction mechanisms such as piezoresistivity, capacitive sensing, optically interrogated displacement, piezoelectricity, and electrostatic actuation.
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Optical Fiber Gas Pressure Sensor Based on Polydimethylsiloxane Microcavity
TL;DR: In this paper, a high-sensitive gas pressure sensor was fabricated by splicing the singlemode fiber (SMF) and a short section of hollow-core fiber (HCF) which was filled with a Polydimethylsiloxane (PDMS) film to form an enclosed air microcavity with the length of 55 μm.
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Optical Fiber Fabry–Perot Acoustic Sensors Based on Corrugated Silver Diaphragms
TL;DR: The proposed fabrication method of the corrugated diaphragm showed the advantages of simplicity and low cost, and the acoustic sensors showed high sensitivity, which was suitable for weak acoustic’s sensing.
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Oil-paper insulation partial discharge ultrasonic multifrequency sensing array based on fibre-optic Fabry–Perot sensor
High Sensitivity Fiber Gas Pressure Sensor with Two Separated Fabry–P é rot Interferometers Based on the Vernier Effect
TL;DR: In this paper , a high sensitivity optical gas pressure sensor based on paralleled Fabry-P é rot interferometers (FPIs) was demonstrated, which showed great advantages in sensitivity, mechanical strength, cost, and temperature influence resistant, which has potential in adverse-circumstance gas pressure sensing.
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