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High-performance optical fiber humidity sensor based on lossy mode resonance using a nanostructured polyethylenimine and graphene oxide coating
摘要： In this study, a rapid optical fiber sensor for humidity with high sensitivity and wide detection range has been constructed, based on lossy mode resonance (LMR). A thin film made of alternating polyethylenimine (PEI) and graphene oxide (GO) layers was selected as sensitive coating. It was deposited on a SnO2-sputtered fiber core in a dip-assisted layer-by-layer assembly. The structure and surface chemistry of the raw materials were investigated by means of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Key properties such as sensitivity, linearity, hysteresis, stability and response and recovery times were characterized. The sensor exhibited excellent sensitivity, especially at high relative humidity (RH) levels, and short reaction and retrieval periods. This research provides a viable and practical way to fabricate high performance humidity optical fiber sensors with GO-based nanostructured coatings.
关键词： relative humidity sensor,layer-by-layer,breathing monitoring,graphene oxide,lossy mode resonance,Optical fiber sensor
更新于2025-09-19 17:15:36
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Integrated Optical Fiber Force Myography Sensor as Pervasive Predictor of Hand Postures
摘要： Force myography (FMG) is an appealing alternative to traditional electromyography in biomedical applications, mainly due to its simpler signal pattern and immunity to electrical interference. Most FMG sensors, however, send data to a computer for further processing, which reduces the user mobility and, thus, the chances for practical application. In this sense, this work proposes to remodel a typical optical fiber FMG sensor with smaller portable components. Moreover, all data acquisition and processing routines were migrated to a Raspberry Pi 3 Model B microprocessor, ensuring the comfort of use and portability. The sensor was successfully demonstrated for 2 input channels and 9 postures classification with an average precision and accuracy of ~99.5% and ~99.8%, respectively, using a feedforward artificial neural network of 2 hidden layers and a competitive output layer.
关键词： user interface,optical fiber sensor,Force myography,gesture recognition,integrated sensor
更新于2025-09-19 17:13:59
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A novel periodically tapered structure-based gold nanoparticles and graphene oxide a?? Immobilized optical fiber sensor to detect ascorbic acid
摘要： This work presents a study, analysis, design, and characterization of a localized surface plasmon resonance (LSPR) based ascorbic acid (AA) sensor with improved sensitivity compared to those already reported. Various multi-tapered (four, five, and eight tapered) optical fiber sensors (OFSs) have been developed and characterized in this study. Along with these, different nanomaterials (NMs), such as gold nanoparticles (AuNPs) and graphene oxide (GO), are immobilized over the bare probe. Further, NMs immobilized probes are functionalized with ascorbate oxidase. The AuNPs are well studied in the past with the variation in size, shape and surface functionalization and have been found to be well-suited NMs for biosensing applications. On the other hand, GO-based material is equally promising in the nanostructure-based optical sensing due to their broad surface area, high electrical conductivity, good chemical stability, and excellent mechanical behavior. The performance parameters of the proposed sensor, such as sensitivity (8.3 nm/mM), correlation correlator (0.9724), and limit of detection (51.94 μM) are greatly improved over the previous designs. A wide range of characterization and validation of NMs immobilized structures are reported here. It indicates a great potential in the practical implementation of LSPR based OFSs for routine diagnostics.
关键词： Multi-tapered optical fiber sensor,Ascorbic acid,Gold nanoparticles,Ascorbate oxidase,Graphene oxide
更新于2025-09-19 17:13:59
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Design and Characterization of Surface Relief Grating on Etched Multimode Optical Fiber For Refractive Index Sensing
摘要： We report a simple and compact optical fiber sensor based on surface relief gratings in conventional graded-index multimode optical fiber (GIMMF) for refractive index sensing. Bragg gratings on MMF are less explored compared to its single mode counterpart, even though the MMF platform possesses several advantages such as robustness, enhanced light-matter interaction and easy light coupling. In this work, surface relief gratings are directly written on one side of the cladding etched MMF core surface by using focused ion beam milling (FIB). A detailed theoretical analysis of the structure and sensing principle is analysed. The device performance as a refractive index sensor has been investigated experimentally by immersing the device in different concentration of NaCl solution. Experimental results show a sensitivity of 70 nm/RIU for a refractive index range of 1.333 to 1.345. The device is easy to fabricate with high repeatability and low cost, compactness in design and competent to be used in harsh environmental conditions. The surface grating on etched MMF provides a better interaction between the sensing region and the environment which makes it a potential candidate for various chemical and biological sensing applications.
关键词： optical fiber sensor,refractive index sensor,Multimode optical fiber grating,optical fiber micro-machining
更新于2025-09-16 10:30:52
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[IEEE 2019 2nd International Colloquium on Smart Grid Metrology (SMAGRIMET) - Split, Croatia (2019.4.9-2019.4.12)] 2019 2nd International Colloquium on Smart Grid Metrology (SMAGRIMET) - Fiber Optic Sensor Cable Based on Hollow Capillary Tube with Three Tightly Encapsulated Optical Fibers
摘要： Fiber optic sensor cable technology is relatively new field that combines a set of scientific and technical disciplines in a special way in order to meet industrial standards. In this paper we discuss one particular design for multipurpose and configuration multivalent optical fiber sensing. It has the potential to integrate more detection and measurement techniques in one cable body and this, in turn, largely contributes to installation cost optimization and directly impacts investment plans and industrial success. The article presents also a unique high-pressure high temperature lab facility conceptualized and constructed for testing and evaluation of this and similar optical fiber sensor cables.
关键词： fiber optic measurements,OFDR,acoustic sensors,BOTDA,BOTDR,DAS,Brillouin effect,optical fiber,pressure sensors,fully distributed optical fiber sensor,monitoring systems,strain sensors,temperature sensors,OTDR
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Optimized Sensitivity Analysis of Phase Modulated Optical Fiber Sensor
摘要： the Influence of different oxide overlayers on performance of phase modulated optical fiber sensor coated with graphene is reported. The simulation model is constructed according to the the transmission matrix theory. In this work, we improve the phase sensitivity of the sensor by adding different oxides coatings include magnesium oxide (MgO), aluminum oxide (Al2O3), lutetium oxide (Lu2O3), scandium oxide (Sc2O3) and tellurium dioxide (TeO2) on the surface of monolayer graphene. The phase sensitivity of the sensor is optimized by the type and thickness of oxide coating. The phase sensitivity of the sensor with 35 nm TeO2 coating on the surface of monolayer graphene achieved 1.3467× 105deg/RIU.
关键词： phase modulated,refractive index,optical fiber sensor,D-type optic fiber,oxide
更新于2025-09-16 10:30:52
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Electrochemical performance of indium-tin-oxide-coated lossy-mode resonance optical fiber sensor
摘要： Analysis of liquids performed in multiple domain, e.g., optical and electrochemical (EC), has recently focus significant attention. Our previous works have shown that a simple device based on indium-tin-oxide (ITO) coated optical fiber core may be used for optical monitoring of EC processes. At satisfying optical properties and thickness of ITO a lossy-mode resonance (LMR) effect can be obtained and used for monitoring of optical properties of an analyte in proximity of the ITO surface. However, EC response of the ITO-LMR device to a redox probe has not been achieved for ITO-LMR sensor whereas it is generally observed for commercially available ITO electrodes. The changes in the response to a redox probe are typically used as a sensing parameter when EC label-free sensing is considered, so it is crucial for further development of combined LMR-EC sensing concept. In this work, we focus on enhancing the EC activity of the device by tuning ITO magnetron sputtering deposition parameters. Influence of the deposition pressure on the ITO properties has been the main consideration. Both optical and EC readouts in 0.1 M KCl containing such redox probes as 1 mM of K3[Fe(CN)6] or 1 mM 1,1′-Ferrocenedimethanol were discussed at different scan rate. The performed studies confirm that for optimized ITO properties the ITO-LMR sensor used as the EC electrode may also show excellent EC performance. The observed EC processes are quasi-reversible and diffusion-controlled. Moreover, for the devices, which offer improved EC response, an optical monitoring of the EC process is also possible. According to our best knowledge, fully functional combined optical and EC sensor, where optical effect is resonance-based and other than well-known surface plasmon resonance, is presented for the first time.
关键词： Electrochemical properties,Cyclic voltammetry,Optical properties,Lossy-mode resonance,Optical fiber sensor,Indium tin oxide,Magnetron sputtering
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Research on the Gain Saturation Induced Noise in an Optical Fiber Sensing System
摘要： In an optical fiber sensing time division multiplexing (TDM) system, when the optical pulse with high peak power and low repetition rates is boost amplified, it is prone to be gain saturation and pulse distortion. The paper analysed their effects on the intensity and phase noises, and the results show that the pulse distortion induced noise is mainly down-converted relative intensity noise (RIN) lines spectra caused by the gain jitter. Then the RIN lines are converted into corresponding phase noise lines by the interferometer, which finally cause false signals in the sensor system. However in the case of saturated gain and pulse distortion, the increase of noise background is insignificant. Basing on the above results, several noise suppression schemes have been proposed, which will provide guidance for the design of large-scale remote sensing systems in the future.
关键词： Pulse distortion,Gain saturation,Relative intensity noise,Phase noise,Optical fiber sensor
更新于2025-09-16 10:30:52
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[IEEE 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Sao Paulo, Brazil (2019.10.7-2019.10.9)] 2019 SBFoton International Optics and Photonics Conference (SBFoton IOPC) - Using the Smartphone as an Ubiquitous Platform for Implementing Optical Fiber Sensors
摘要： This paper reports the development of a low-cost kit to turn smartphones into versatile platforms for interrogating optical fiber sensors. The adapter for connecting the fiber to the phone camera was 3D printed, whereas the application software was programmed for AndroidTM operating system. Different types of sensors based on multimode fiber and LED source were tested. The resolutions for the microbending displacement sensor, the fiber reflectometer, and the macrobending temperature probe are 26 μm, 0.0006 RIU, and 3.9?C, respectively. In addition to a didactic kit for photonics classes, the proposed device can also be used as a portable sensor for multiple purposes since the transducer modulus can be exchanged to assess different physical and chemical variables.
关键词： smart devices,optical fiber sensor,open educational resources,mobile applications
更新于2025-09-16 10:30:52
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Development of Smart Structure for Satellite Using Optical Fiber Sensors
摘要： 本開発では，はじめに，宇宙熱環境における太陽電池パネルの熱構造設計を地上試験で検証するため，光ファイバセンサを活用した健全性評価手法を開発した．本手法により，低温環境でのサブストレートのディンプル変形に起因するパネル内部の損傷発生を光ファイバセンサで検知できることを示した．次に，その開発技術を応用し，センサの着脱工程を削減して試験工期を短縮するため，光ファイバセンサ一体型衛星構造「スマート熱構造」の開発に取り組んだ．光ファイバ温度センサを開発し，数十点規模の温度センサとひずみセンサを備えた実験モデルを試作し，その製造性を確認した．また，その実験モデルを用いて，熱真空試験や四点曲げ試験を実施し，従来センサとほぼ同等の精度にて温度やひずみが計測できることを示した．さらに，スマート熱構造に搭載した電子機器内の部品にも温度センサを取り付けて動作試験を行い，従来では取得できなかった狭小部の温度も計測した．これらの結果から，スマート熱構造が実現可能であることを示した．
关键词： CFRP,Strain,Temperature,Multi-point measurement,Smart structure,Satellite,Optical fiber sensor,Damage detection
更新于2025-09-16 10:30:52