scholarly journals Microcystin-LR detection in water by the Fabry–Pérot interferometer using an optical fibre coated with a sol–gel imprinted sensing membrane

2011 ◽  
Vol 26 (9) ◽  
pp. 3932-3937 ◽  
Author(s):  
Raquel B. Queirós ◽  
S.O. Silva ◽  
J.P. Noronha ◽  
O. Frazão ◽  
P. Jorge ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Sol Gel ◽  
Fabry Perot ◽  
Sensing Membrane

Optical-fibre Fabry–Perot frequency discriminator for communications applications

1987 ◽  
Vol 23 (9) ◽  
pp. 463 ◽  
Author(s):  
L.J. Cimini ◽  
J. Stone ◽  
L.L. Buhl
Keyword(s):  
Optical Fibre ◽  
Frequency Discriminator ◽  
Fabry Perot

scholarly journals Development of Ratiometric Fluorescence Sensors Based on CdSe/ZnS Quantum Dots for the Detection of Hydrogen Peroxide

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4977 ◽  
Author(s):  
Hong Dinh Duong ◽  
Jong Il Rhee
Keyword(s):  
Hydrogen Peroxide ◽  
Quantum Dots ◽  
Sol Gel ◽  
Carboxyl Group ◽  
Ratiometric Fluorescence ◽  
Fluorescence Sensors ◽  
Linear Detection ◽  
Sensing Membrane ◽  
Reductive Pathway ◽  
Higher Sensitivity

In this study, carboxyl group functionalized-CdSe/ZnS quantum dots (QDs) and aminofluorescein (AF)-encapsulated polymer particles were synthesized and immobilized to a sol–gel mixture of glycidoxypropyl trimethoxysilane (GPTMS) and aminopropyl trimethoxysilane (APTMS) for the fabrication of a hydrogen peroxide-sensing membrane. CdSe/ZnS QDs were used for the redox reaction of hydrogen peroxide (H2O2) via a reductive pathway by transferring electrons to the acceptor that led to fluorescence quenching of QDs, while AF was used as a reference dye. Herein, the ratiometric fluorescence intensity of CdSe/ZnS QDs and AF was proportional to the concentration of hydrogen peroxide. The fluorescence membrane (i.e., QD–AF membrane) could detect hydrogen peroxide in linear detection ranges from 0.1 to 1.0 mM with a detection limit (LOD) of 0.016 mM and from 1.0 to 10 mM with an LOD of 0.058 mM. The sensitivity of the QD–AF membrane was increased by immobilizing horseradish peroxidase (HRP) over the surface of the QD–AF membrane (i.e., HRP–QD–AF membrane). The HRP–QD–AF membrane had an LOD of 0.011 mM for 0.1–1 mM H2O2 and an LOD of 0.068 mM for 1–10 mM H2O2. It showed higher sensitivity than the QD–AF membrane only, although both membranes had good selectivity. The HRP–QD–AF membrane could be applied to determine the concentration of hydrogen peroxide in wastewater, while the QD–AF membrane could be employed for the detection of α-ketobutyrate.

Fiber Optic Hydrogen Sensor Based on Fabry–Perot Interferometer Coated With Sol-Gel Pt/WO 3 Coating

2015 ◽  
Vol 33 (12) ◽  
pp. 2530-2534 ◽  
Author(s):  
Yao Wang ◽  
Minghong Yang ◽  
Guilin Zhang ◽  
Jixiang Dai ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Sol Gel ◽  
Hydrogen Sensor ◽  
Fabry Perot

A Fabry–Perot interferometer formed in the core of a composite optical fibre heavily doped with phosphorus oxide

2019 ◽  
Vol 49 (12) ◽  
pp. 1140-1144
Author(s):  
O N Egorova ◽  
S A Vasil'ev ◽  
I G Likhachev ◽  
S E Sverchkov ◽  
B I Galagan ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Phosphorus Oxide ◽  
The Core ◽  
Fabry Perot ◽  
Heavily Doped

The Spectrum of a Bent Fiber Fabry-Perot Interferometer under Small Variations of the Refractive Index of the Environment

2013 ◽  
Vol 677 ◽  
pp. 363-367
Author(s):  
Yuri N. Kulchin ◽  
Oleg B. Vitrik ◽  
Stanislav O. Gurbatov
Keyword(s):  
Refractive Index ◽  
Optical Fibre ◽  
Ambient Medium ◽  
Fibre Optic ◽  
Core Mode ◽  
Wide Range ◽  
Fabry Perot ◽  
Resonance Coupling ◽  
Refractive Index Sensors

The phase of light propagating through a bent optical fibre is shown to depend on the refractive index of the medium surrounding the fibre cladding when there is resonance coupling between the guided core mode and cladding modes. This shifts the spectral maxima in the bent fibre-optic Fabry–Perot interferometer. The highest phase and spectral sensitivities achieved with this interferometer configuration are 0,71 and 0,077, respectively, and enable changes in the refractive index of the ambient medium down to 5∙10–6 to be detected. This makes the proposed approach potentially attractive for producing highly stable, precision refractive index sensors capable of solving a wide range of liquid refractometry problems.

Preparation of SiO2-B2O3 glass for PANDA optical fibre from colloidal sol-gel process

2001 ◽  
Vol 37 (23) ◽  
pp. 1381
Author(s):  
H. Segawa ◽  
T. Kawano ◽  
K. Yoshida
Keyword(s):  
Optical Fibre ◽  
Sol Gel ◽  
Sol Gel Process ◽  
B2o3 Glass

Posture measurement of soft pneumatic bending actuator using optical fibre-based sensing membrane

2019 ◽  
Vol 46 (1) ◽  
pp. 118-127 ◽  
Author(s):  
Guangkai Sun ◽  
Yang Hu ◽  
Mingli Dong ◽  
Yanlin He ◽  
Mingxin Yu ◽  
...  
Keyword(s):  
Feedback Control ◽  
Optical Fibre ◽  
Repeated Measurements ◽  
Soft Robotics ◽  
Wavelength Shift ◽  
Content Type ◽  
Bending Actuator ◽  
Soft Actuators ◽  
Sensing Membrane ◽  
Posture Measurement

Purpose Soft robotics is a burgeoning field owing to its high adaptability and safety in human–machine interaction and unstructured environments. However, the feedback control of soft actuators with flexible sensors is still a challenge. Design/methodology/approach To address this issue, this study proposes an optical fibre-based sensing membrane for the posture measurement of soft pneumatic bending actuators. The major contribution is the development of a flexible sensing membrane with a high sensitivity and repeatability for the feedback control of soft actuators. The characteristics of sensing membrane were analysed. The relationship between wavelength shift and bending curvature was derived. The curvatures of soft actuator were measured at four bending status, and the postures were reconstructed. Findings The results indicate that the measurement error is less than 2.1% of the actual bending curvature. The sensitivity is up to 212.8 pm/m−1, and the signal fluctuation in repeated measurements is negligible. This approach has broad application prospects in soft robotics, because it makes the optical fibre achieve more strength and compatible with soft actuators, thus improving the sensing accuracy, sensitivity and reliability of fibre sensors. Originality/value Different from previous approaches, an optical fibre with FBGs is embedded into a multilayered polyimide film to form a flexible sensing membrane, and the membrane is embedded into a soft pneumatic bending actuator as the smart strain limited layer which is able to measure the posture in real time. This approach makes the optical fibre stronger and compatible with the soft pneumatic bending actuator, and the sensing accuracy, sensitivity and reliability are improved. The proposed sensing configuration is effective for the feedback control of the soft pneumatic bending actuators.

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