A Miniature Fabry–Pérot Fiber Interference Sensor Based on Polyvinyl Chloride Membrane for Acoustic Pressure Sensing in Mid–High-Frequency Band

In this paper, a Fabry–Pérot interference fiber sensor was fabricated by using a Polyvinyl chloride membrane (20 μm in thickness) attached at the end of a ferrule with an inner diameter of 1.1 mm. In consideration of the vibration response of the membrane, the feature of the first-order natural frequency of membrane was analyzed by COMSOL Multiphysics. The acoustic sensing performance of the Fabry–Pérot fiber interference sensor was studied in air. The results reveal that the sensor possessed good acoustic pressure sensitivity, in the order of 33.26 mV/Pa. In addition, the noise-limited minimum detectable pressure level was determined to be 58.9 μPa/Hz1/2 and the pressure-induced deflection obtained was 105 nm/Pa at the frequency of 1 kHz. The response of the sensor was approximately consistent with the reference sensor from 1 to 7 kHz. All these results support that the fabricated Fabry–Pérot fiber interference sensor may be applied for ultra-sensitive pressure sensing applications.

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Flexible Polymer-Ceramic Composite Materials for High Sensitive Pressure Sensing Applications in Harsh Environments

10.33915/etd.7140 ◽

2017 ◽

Author(s):

Kavin Sivaneri Varadharajan Idhaiam

Keyword(s):

Composite Materials ◽

Ceramic Composite ◽

Harsh Environments ◽

Pressure Sensing ◽

Sensing Applications ◽

Flexible Polymer ◽

Ceramic Composite Materials ◽

Sensitive Pressure

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Investigation of Composite Structure with Dual Fabry–Perot Cavities for Temperature and Pressure Sensing

Photonics ◽

10.3390/photonics8050138 ◽

2021 ◽

Vol 8 (5) ◽

pp. 138

Author(s):

Jun Wang ◽

Long Li ◽

Shuaicheng Liu ◽

Diyang Wu ◽

Wei Wang ◽

...

Keyword(s):

Silicone Rubber ◽

Cavity Length ◽

Applied Pressure ◽

Fiber Sensors ◽

Pressure Sensing ◽

Fabrication Cost ◽

Sensing Applications ◽

Fabry Perot ◽

Temperature And Pressure ◽

Transfer Method

To deeply analyze the influence of diaphragm materials on the temperature and pressure sensitivity of Fabry–Perot interferometer-based dual-parameter fiber sensors, the multiple transfer method was used to fabricate the dual Fabry–Perot cavities, respectively, consisting of the following combinations: epoxy resin AB/polydimethylsiloxane (PDMS), Ecoflex0030 silicone rubber /PDMS, and PDMS/Ecoflex0030 silicone rubber. Experimental results show that the temperature sensitivities are, respectively, 528, 540, and 1033 pm/°C in the range of 40–100 °C. Within the applied pressure range of 100–400 kPa, the pressure sensitivities are, respectively, 16.0, 34.6, and 30.2 pm/kPa. The proposed sensors have advantages of proper sensitivity, simple fabrication, cost-effectiveness, controllable cavity length, and suitability for practical sensing applications.

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High Sensitivity Fiber Gas Pressure Sensor with Two Separated Fabry–Pérot Interferometers Based on the Vernier Effect

Photonics ◽

10.3390/photonics9010031 ◽

2022 ◽

Vol 9 (1) ◽

pp. 31

Author(s):

Xiaokang Song ◽

Liangtao Hou ◽

Xiangyu Wei ◽

Hang Su ◽

Chang Li ◽

...

Keyword(s):

Pressure Sensor ◽

Pressure Sensors ◽

High Sensitivity ◽

Single Mode ◽

Gas Pressure ◽

Pressure Sensing ◽

Fabry Perot ◽

Inner Diameter ◽

Vernier Effect ◽

Micro Cavity

A high sensitivity optical fiber gas pressure sensor based on paralleled Fabry–Pérot interferometers (FPIs) was demonstrated. One micro-cavity FPI is used as a reference FPI (FPI-1) to generate a Vernier effect and the other FPI (FPI-2) is used as a sensing tip. Both FPIs are connected by a 3-dB coupler to form a paralleled structure. The FPI-1 was fabricated by fusion splicing a piece of hollow core fiber (HCF) between two sections of single-mode fibers (SMF), whereas FPI-2 was formed by fusion splicing a section of HCF between SMF and a piece of HCF with a slightly smaller inner diameter for sensing pressure. The gas pressure sensitivity was amplified from 4 nm/MPa of single FPI to 45.76 nm/MPa of paralleled FPIs with an amplification factor of 11.44 and a linearity of 99.9%. Compared with the traditional fiber gas pressure sensors, the proposed sensor 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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