scholarly journals A High Precision Fiber Optic Fabry–Perot Pressure Sensor Based on AB Epoxy Adhesive Film

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 581
Author(s):  
Yanan Zhang ◽  
Shubin Zhang ◽  
Haitao Gao ◽  
Danping Xu ◽  
Zhuozhen Gao ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Epoxy Adhesive ◽  
Curing Time ◽  
Adhesive Film ◽  
Interference Spectrum ◽  
Fabry Perot ◽  
Potential Applications

This paper proposes a Fabry–Perot pressure sensor based on AB epoxy adhesive with ultra-high sensitivity under low pressure. Fabry–Perot interference, located between single-mode fiber (SMF) and hollow-core fiber (HCF), is an ultra-thin AB epoxy film formed by capillary action. Then the thick HCF was used to fix the HCF and SMF at both ends with AB epoxy adhesive. Experimental results show that when the thickness of AB epoxy film is 8.74 μm, and the cavity length is 30 μm, the sensor has the highest sensitivity. The sensitivity is 257.79 nm/MPa within the pressure range of 0–70 kPa. It also investigated the influence of the curing time of AB epoxy on the interference spectrum. Experiments showed that the interference spectrum peak is blue-shifted with the increase of curing time. Our study also demonstrated the humidity stability of this pressure sensor. These characteristics mean that our sensor has potential applications in the biomedical field and ocean exploration.

scholarly journals A Micro Bubble Structure Based Fabry–Perot Optical Fiber Strain Sensor with High Sensitivity and Low-Cost Characteristics

Sensors ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 555 ◽  
Author(s):  
Lu Yan ◽  
Zhiguo Gui ◽  
Guanjun Wang ◽  
Yongquan An ◽  
Jinyu Gu ◽  
...  
Keyword(s):  
Low Cost ◽  
Strain Sensor ◽  
Glass Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fabry Perot ◽  
Micro Bubble ◽  
Bubble Structure ◽  
Cost Characteristics

A high-sensitivity, low-cost, ultrathin, hollow fiber micro bubble structure was proposed; such a bubble can be used to develop a high-sensitivity strain sensor based on a Fabry–Perot interferometer (FPI). The micro bubble is fabricated at the fiber tip by splicing a glass tube to a single mode fiber (SMF) and then the glass tube is filled with gas in order to expand and form a micro bubble. The sensitivity of the strain sensor with a cavity length of about 155 μm and a bubble wall thickness of about 6 μm was measured to be up to 8.14 pm/μϵ.

scholarly journals Cascaded-Cavity Fabry-Perot Interferometric Gas Pressure Sensor based on Vernier Effect

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3677 ◽  
Author(s):  
Peng Chen ◽  
Yutang Dai ◽  
Dongsheng Zhang ◽  
Xiaoyan Wen ◽  
Minghong Yang
Keyword(s):  
Capillary Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Gas Pressure ◽  
Glass Capillary ◽  
Compact Structure ◽  
Fabry Perot ◽  
Fs Laser ◽  
Vernier Effect

An extrinsic Fabry-Perot interferometer (EFPI) composed of double fiber FP cavities in a glass capillary tube to generate Vernier effect has been fabricated and employed for gas pressure sensing. A lead-in single-mode fiber (LSMF) and a reflective single-mode fiber (RSMF) were inserted into the capillary tube to form a FP cavity. Femtosecond (fs) laser was used to ablate openings on a capillary tube for gas passage to the FP cavity. A fusion hole was also drilled on the end face of a SMF by fs laser. The sensitivity of the sensor is enhanced due to Vernier effect. Experimental results show that the sensitivity was as high as 86.64 nm/MPa in the range of 0~0.6 MPa, which is 32.8 times larger than that of an open-cavity EFPI sensor without Vernier effect. The temperature cross-sensitivity of the sensor was measured to be about 5.18 KPa/°C. The proposed sensor was characterized by its high sensitivity, compact structure and ease of fabrication, and would have extensive application prospects in gas sensing fields.

scholarly journals An Optical Fiber Fabry–Perot Pressure Sensor with Optimized Thin Microbubble Film Shaping for Sensitivity Enhancement

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 358 ◽  
Author(s):  
Shubin Zhang ◽  
Zhenjun Shao ◽  
Jinrong Liu ◽  
Meixue Zong ◽  
Jian Shen ◽  
...  
Keyword(s):  
Thin Film ◽  
Arc Discharge ◽  
Structural Parameters ◽  
Silicon Film ◽  
Glass Tube ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Fabry Perot ◽  
Micrometer Scale

A pressure-assisted arc discharge method of preparing silicon microbubbles with a glass tube was utilized for decreasing the bubble film’s thickness and improving the bubble’s uniformity. By controlling the arc discharge intensity, discharge time and the position of the fiber carefully, the thickness of the microbubble film was reduced to the micrometer scale. Later, the thin film of the microbubble was transferred to the end the single-mode-fiber/glass-tube structure, for forming the FP (Fabry–Perot) interference cavity. As the thin film is sensitive to the outer pressure, such a configuration could be used for a high-sensitive-pressure measurement. Experimental results show that the sensitivity of this FP (Fabry–Perot) cavity was 6790 pm/MPa when the outer pressure ranges from 100 to 1600 kPa, and the relationship between the structural parameters of the thin film and the outer pressure was theoretically analyzed. Moreover, this special structure made of the end silicon film microbubble is more suitable for high-sensitivity applications.

scholarly journals Silicone Rubber Based Highly Sensitive Fiber-Optic Fabry–Perot Interferometric Gas Pressure Sensor

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4927
Author(s):  
Xin Cheng ◽  
Jitendra Dash ◽  
Dinusha Gunawardena ◽  
Lin Htein ◽  
Hwa-Yaw Tam
Keyword(s):  
Silicone Rubber ◽  
Pressure Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Gas Pressure ◽  
Silica Tube ◽  
Capillary Action ◽  
Highly Sensitive ◽  
Fabry Perot ◽  
Good Contrast

A simple, compact, and highly sensitive gas pressure sensor based on a Fabry–Perot interferometer (FPI) with a silicone rubber (SR) diaphragm is demonstrated. The SR diaphragm is fabricated on the tip of a silica tube using capillary action followed by spin coating. This process ensures uniformity of its inner surface along with reproducibility. A segment of single mode fiber (SMF) inserted into this tube forms the FPI which produces an interference pattern with good contrast. The sensor exhibits a high gas pressure sensitivity of −0.68 nm/kPa along with a low temperature cross-sensitivity of ≈ 1.1 kPa/°C.

Theoretical Analysis of a New Intrinsic Fabry-Perot Interferometric Fiber Pressure Sensor Structure

2013 ◽  
Vol 331 ◽  
pp. 303-306
Author(s):  
Ning Wang ◽  
Jian Bo Fu ◽  
Xiao Xia Li
Keyword(s):  
Pressure Sensor ◽  
Fiber Diameter ◽  
High Sensitivity ◽  
Single Mode ◽  
Pressure Sensitivity ◽  
Response Curves ◽  
Multimode Fibers ◽  
Sensor Structure ◽  
Fabry Perot ◽  
Different Diameters

The theoretical model is got for a new intrinsic Fabry-Perot interferometric fiber pressure sensor structure fabricated by single mode and multimode fibers with different diameters. The pressure response curves are simulated by Matlab software. The analysis results showed that the pressure sensitivity decreased with the diameter of multimode fiber increased at some area, but the sensitivity begins to increase when the diameter value is more than critical point. The high sensitivity can be still got by increasing fiber diameter.

scholarly journals A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1819 ◽  
Author(s):  
Zhoubing Li ◽  
Yue Zhang ◽  
Chunqiao Ren ◽  
Zhengqi Sui ◽  
Jin Li
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Compact Structure ◽  
Fabry Perot ◽  
Temperature Monitor ◽  
Core Fiber ◽  
Fitting In

In this paper, a miniature Fabry-Perot temperature probe was designed by using polydimethylsiloxane (PDMS) to encapsulate a microfiber in one cut of hollow core fiber (HCF). The microfiber tip and a common single mode fiber (SMF) end were used as the two reflectors of the Fabry-Perot interferometer. The temperature sensing performance was experimentally demonstrated with a sensitivity of 11.86 nm/°C and an excellent linear fitting in the range of 43–50 °C. This high sensitivity depends on the large thermal-expansion coefficient of PDMS. This temperature sensor can operate no higher than 200 °C limiting by the physicochemical properties of PDMS. The low cost, fast fabrication process, compact structure and outstanding resolution of less than 10−4 °C enable it being as a promising candidate for exploring the temperature monitor or controller with ultra-high sensitivity and precision.

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

Photonics ◽  
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.

scholarly journals A Large-Area and Nanoscale Graphene Oxide Diaphragm-Based Extrinsic Fiber-Optic Fabry–Perot Acoustic Sensor Applied for Partial Discharge Detection in Air

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2312
Author(s):  
Shuchao Wang ◽  
Weigen Chen
Keyword(s):  
Graphene Oxide ◽  
Fiber Optic ◽  
Partial Discharge ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Acoustic Sensor ◽  
Performance Tests ◽  
Large Area ◽  
Fabry Perot

This article presents an extrinsic fiber-optic acoustic sensor applied for partial discharge (PD) detection in air. A Fabry–Perot (F-P) cavity consisting of a single-mode fiber (SMF) and a graphene oxide (GO) film, whose thickness and effective vibration diameter are approximately 500 nm and 4.377 mm, respectively, is used as this sensing core, and the manufacturing process of GO diaphragms and this sensing probe is illustrated to be simple and controllable. Performance tests indicate that this proposed sensor maintains a linear acoustic-pressure response and a flat frequency response in the range of 200 Hz to 20 kHz, while being an omnidirectional sensor and having high working stability during a ten-day test period. Additionally, PD detection results show that the minimum PD size detected by this proposed sensor in air was approximately 100 pC, which demonstrates that this proposed sensor can achieve high-sensitivity PD detection in air.

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