scholarly journals Opto-Microfluidic Fabry-Perot Sensor with Extended Air Cavity and Enhanced Pressure Sensitivity

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 19
Author(s):  
Pengfei Zhang ◽  
Chao Wang ◽  
Liuwei Wan ◽  
Qianqian Zhang ◽  
Zidan Gong ◽  
...  
Keyword(s):  
Static Pressure ◽  
Liquid Surface ◽  
Microfluidic Channel ◽  
Single Mode ◽  
Pressure Sensitivity ◽  
Air Cavity ◽  
Surface Reflection ◽  
Sensor Structure ◽  
Fabry Perot ◽  
Silica Capillary

An opto-microfluidic static pressure sensor based on a fiber Fabry-Perot Interferometer (FPI) with extended air cavity for enhancing the measuring sensitivity is proposed. The FPI is constructed in a microfluidic channel by the combination of the fixed fiber-end reflection and floating liquid surface reflection faces. A change of the aquatic pressure will cause a drift of the liquid surface and the pressure can be measured by detecting the shift of the FPI spectrum. Sensitivity of the sensor structure can be enhanced significantly by extending the air region of the FPI. The structure is manufactured by using a common single-mode optical fiber, and a silica capillary with the inner wall coated with a hydrophobic film. A sample with 3500 μm air cavity length has demonstrated the pressure sensitivity of about 32.4 μm/kPa, and the temperature cross-sensitivity of about 0.33 kPa/K.

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 Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pablo Roldán-Varona ◽  
Rosa Ana Pérez-Herrera ◽  
Luis Rodríguez-Cobo ◽  
Luis Reyes-González ◽  
Manuel López-Amo ◽  
...  
Keyword(s):  
Optical Fiber Sensor ◽  
Liquid Level ◽  
Hollow Core ◽  
Immiscible Liquids ◽  
Fabry Perot ◽  
Detection Mode ◽  
Level Sensor ◽  
Core Fiber ◽  
Liquid Level Sensor ◽  
Silica Capillary

AbstractIn this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary hollow-core fiber is used. The fiber, with a sensing length of 1.55 mm, has been processed with a femtosecond laser, so that it incorporates four holes in its structure. In this way, the liquid enters the air core, and it is possible to perform the sensing through the Fabry–Perot cavities that the liquid generates. The detection mode is in reflection. With a resolution of 4 μm (liquid level), it is in the state of the art of this type of sensor. The system is designed so that in the future it will be capable of measuring the level of immiscible liquids, that is, liquids that form stratified layers. It can be useful to determine the presence of impurities in tanks.

scholarly journals Fabrication and Qualitative Analysis of an Optical Fibre EFPI-Based Temperature Sensor

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4445
Author(s):  
Fintan McGuinness ◽  
Aidan Cloonan ◽  
Mohamed Oubaha ◽  
Dinesh Babu Duraibabu ◽  
M. Mahmood Ali ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Single Mode ◽  
Outer Diameter ◽  
The Novel ◽  
Single Mode Fibre ◽  
Manufacturing Technique ◽  
Sensor Structure ◽  
Sensitive Sensor ◽  
Quartz Capillary ◽  
Mode Fibre

The following presents a comparison of an extrinsic Fabry–Perot interferometer (EFPI)-based temperature sensor, constructed using a novel diaphragm manufacturing technique, with a reference all-glass EFPI temperature sensor. The novel diaphragm was manufactured using polyvinyl alcohol (PVA). The novel sensor fabrication involved fusing a single-mode fibre (SMF) to a length of fused quartz capillary, which has an inner diameter of 132 μm and a 220 μm outer diameter. The capillary was subsequently polished until the distal face of the capillary extended approximately 60 μm beyond that of the single mode fibre. Upon completion of polishing, the assembly is immersed in a solution of PVA. Controlled extraction resulted in creation of a thin diaphragm while simultaneously applying a protective coating to the fusion point of the SMF and capillary. The EFPI sensor is subsequently sealed in a second fluid-filled capillary, thereby creating a novel temperature sensor structure. Both temperature sensors were placed in a thermogravimetric analyser and heated from an indicated 30 °C to 100 °C to qualitatively compare sensitivities. Initial results indicated that the novel manufacturing technique both expedited production and produces a more sensitive sensor when compared to an all-glass construction.

Optimization of Single-/Multi-/Single-Mode Intrinsic Fabry–Perot Fiber Sensors

2012 ◽  
Vol 30 (14) ◽  
pp. 2281-2288 ◽  
Author(s):  
Cheng Ma ◽  
Bo Dong ◽  
E. M. Lally ◽  
Anbo Wang
Keyword(s):  
Single Mode ◽  
Fiber Sensors ◽  
Fabry Perot

Dynamics of single-mode formation in self-seeded Fabry-Perot laser diodes

1995 ◽  
Vol 7 (4) ◽  
pp. 351-353 ◽  
Author(s):  
D. Huhse ◽  
M. Schell ◽  
W. Utz ◽  
J. Kaessner ◽  
D. Bimberg
Keyword(s):  
Laser Diodes ◽  
Single Mode ◽  
Fabry Perot ◽  
Mode Formation

scholarly journals Characterization of small-signal intensity modulation of single-mode fiber grating Fabry-Perot laser source

2012 ◽  
Vol 19 (2) ◽  
pp. 64-70 ◽  
Author(s):  
Hisham Kadhum Hisham ◽  
Ahmad Fauzi Abas ◽  
Ghafour Amouzad Mahdiraji ◽  
Mohd Adzir Mahdi ◽  
Ahmad Shukri Muhammad Noor
Keyword(s):  
Signal Intensity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Intensity Modulation ◽  
Laser Source ◽  
Fiber Grating ◽  
Small Signal ◽  
Fabry Perot

Microbubble based fiber-optic Fabry–Perot interferometer formed by fusion splicing single-mode fibers for strain measurement

2012 ◽  
Vol 51 (8) ◽  
pp. 1033 ◽  
Author(s):  
De-Wen Duan ◽  
Yun-jiang Rao ◽  
Yu-Song Hou ◽  
Tao Zhu
Keyword(s):  
Strain Measurement ◽  
Fiber Optic ◽  
Single Mode ◽  
Fabry Perot

Optical bistable switching in pyran dye-doped polymers

2014 ◽  
Vol 23 (02) ◽  
pp. 1450018 ◽  
Author(s):  
Purnima ◽  
Devendra Mohan
Keyword(s):  
Solid State ◽  
Communication Systems ◽  
Optical Bistability ◽  
Nonlinear Refraction ◽  
Nonlinear Behavior ◽  
Single Mode ◽  
Third Order ◽  
Bistable Switching ◽  
Fabry Perot ◽  
Doped Polymers

In the present frame of work, optical bistability using a Fabry–Perot (FP) cavity containing 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM) dye entrapped in poly-methylmethacrylate (PMMA) matrix is experimentally investigated. Optical nonlinear behavior of solid-state samples is studied using a single-mode Q-switched nanosecond Nd:YAG laser operating at 532 nm. Various optical nonlinear parameters such as nonlinear refractive index (n2) and third-order susceptibility (χ3) of the material are numerically estimated from bistability loops. The origin of optically bistable behavior is attributed to photoisomerization-assisted nonlinear refraction phenomenon. It is observed that nonlinear refraction dominates over nonlinear absorption in giving rise to the optical bistability. The study shows that DCM dye entrapped in solid-state matrices are promising candidate for polymer-based optical switches, data processing, and communication systems.

scholarly journals Detection of isoprene traces in exhaled breath by using photonic crystals as a biomarker for chronic liver fibrosis disease

2021 ◽  
Author(s):  
Ahmed Mehaney ◽  
Hussein A. Elsayed ◽  
Ashour M. Ahmed
Keyword(s):  
Liver Fibrosis ◽  
Photonic Crystals ◽  
High Sensitivity ◽  
Dielectric Materials ◽  
Exhaled Breath ◽  
Air Cavity ◽  
One Dimensional ◽  
Sensor Structure ◽  
Volatile Organic ◽  
First Time

Abstract Detection of blood-carried volatile organic compounds (VOCs) existing in the exhaled breath of human is an attractive research point for noninvasive diagnosis of diseases. In this research, we introduce a novel application of photonic crystals (PCs) for the detection of isoprene traces in the exhaled breath as a biomarker for liver fibrosis. This idea is introduced for the first time according to the best of our knowledge. The proposed sensor structure is a one-dimensional (1D) PC constructed from a multilayer stack of two dielectric materials covered with an air cavity layer filled with the dry exhaled breath (DEB) and a thin metallic layer of Au is attached on the top surface. Hence, the proposed sensor is configured as, [prism/Au/air cavity/(GaN/SiO2)10]. The transfer matrix method and the Drude model are adopted to calculate the numerical simulations and reflection spectra of the design. The essential key for sensing isoprene levels is the resonant optical Tamm plasmon (TP) states within the photonic bandgap. The obtained numerical results are promising such as high sensitivity (S) of 0.321 nm/ppm or 278720 nm/RIU. This technique can be reducing the risk of infection during the taking of blood samples by syringe. Also, it can prevent the pain of patients. Finally, this work opens the door for the detection of many diseases by analyzing the breaths of patients based on photonic crystals.

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