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57 篇 会议

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检索条件"任意字段=Conference on Optical Sensing and Detection VII Part of SPIE Photonics Europe Conference"

共 57 条记录，以下是1-10 订阅

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Comparison between different inscription methods of FBG in CYTOP polymer optical fiber 7

Comparison between different inscription methods of FBG in C...

引用

conference on optical sensing and detection vii part of spie photonics europe conference

作者： Chah, Karima Nan, Ying-Gang Chapalo, Ivan Megret, Patrice Caucheteur, Christophe Univ Mons Fac Engn Electromagnetism & Telecommun Dept Blvd Dolez 31 B-7000 Mons Belgium

ISBN: (纸本)9781510651555;9781510651548

We report on the inscription of fiber Bragg grating in perfluorinated polymer optical fiber (CYTOP) by femtosecond pulses laser at 400 nm with phase mask technique and at 800 nm with two direct inscription methods: point-by-point and line-by-line. We analyze the stability of the gratings after inscription and study their sensing properties. To discriminate between the properties of the CYTOP fiber and the influence of the over-clad, we consider gratings produced in CYTOP fiber with and without the over-clad, and we determine their sensitivities to temperature, humidity and strain.

关键词： CYTOP optical fiber FBG femtosecond inscription phase mask

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optical System for Laser Identification of Small-sized Metal Objects for Automated Control Systems 7

Optical System for Laser Identification of Small-sized Metal...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Komisarov, Vladislav A. Chebotarev, Aleksei A. Akhmadullin, Radik M. Kukushkin, Dmitriy E. Sinev, Dmitry A. ITMO Univ Kronverksky Pr 49Bldg A St Petersburg 197101 Russia AO NPP Signal Smolyanaya St 4 St Petersburg 192019 Russia

ISBN: (纸本)9781510651555;9781510651548

The paper presents calculation, selection of components, and simulation of an optical scheme for a laser system developed for identifying small-sized metal objects for automated control systems. The relevance of the research results from the demand for developing a portable, cost efficient, non-contact optical control device based on the principles of measuring the reflected signal after the interaction of laser radiation with metals. The device inventory was analyzed, and the components of the optical system were selected. An optical scheme was developed, and the energy characteristics were calculated.

关键词： detection optical system laser control system object identification laser sensor automation

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optical fiber sensors in agricultural applications 7

Optical fiber sensors in agricultural applications

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Konstantaki, M. Padhye, A. Anthoulakis, E. Poumpouridis, N. Diamantakis, Z. Gavalas, N. Laderos, V Christodoulou, S. Pissadakis, S. Fdn Res & Technol Hellas Inst Elect Struct & Laser Iraklion 70013 Greece Univ Crete Phys Dept Herakion 70013 Greece Winemakers Assoc Dept Heraklion Wines Crete Iraklion 71601 Greece Ionos Iraklion 71409 Crete Greece

ISBN: (纸本)9781510651555;9781510651548

We report on the development of two optical fiber sensors for agricultural applications. Specifically, a Fabry Perot optical fiber sensor with a hydroscopic photo-resin cavity is developed for monitoring oak barrel stave moisture evolution towards the development of a sensor for assessment of oak barrels used in wine aging. Furthermore, an optical fiber long period grating of extended length (similar to 9 cm) is used as line sensor for tracing sprayed copper chlorophyllin water droplet distribution aiming to detect spraying drift during drone chemical pesticide operations.

关键词： optical fiber sensors agriculture oak wine aging drone pesticide spraying

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Nanoparticles sensing and imaging with free-space excited whispering gallery mode microresonators 7

Nanoparticles sensing and imaging with free-space excited wh...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： D'Ambrosio, Davide Capezzuto, Marialuisa Giorgini, Antonio Malara, Pietro Avino, Saverio Castrignano, Salvatore Gagliardi, Gianluca CNR Ist Nazl Ott INO Via Campi Flegrei 34 I-80078 Pozzuoli Italy

ISBN: (纸本)9781510651555;9781510651548

We present a new method for detecting single nanoparticles using a sensor based on a whispering gallery mode resonator submerged in aqueous solutions. A free-space diode laser excites whispering-gallery mode resonances by focusing it on the edge of the microresonator. Its emission frequency is then locked to a resonant mode in order to track any change induced by the interaction of the microsphere with nanoparticles, which can be suspended in the surrounding liquid medium. A theoretical analysis based on some seminal work, together with preliminary noise source evaluation, indicates that frequency shifts down to the order of hundreds of kHz are measurable, thus allowing to detect single nanoparticles. Further upgrades of the experimental scheme aimed at precise nanoparticle sizing and positioning are discussed.

关键词： Whispering gallery modes optical microresonator imaging nanoparticles Lorenz-Mie scattering free-space light coupling

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Temperature and humidity discrimination in Brillouin distributed fiber-optic sensing using machine learning algorithms 7

Temperature and humidity discrimination in Brillouin distrib...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Karapanagiotis, Christos Hicke, Konstantin Krebber, Katerina Bundesanstalt Mat Forsch & Prufung Unter Eichen 87 D-12205 Berlin Germany

ISBN: (纸本)9781510651555;9781510651548

In the last few years, the use of machine learning has emerged in the field of distributed fiber optic sensors as a promising approach to enhance their performance and provide new capabilities. In this study, we use machine learning for simultaneous measurements of temperature and humidity in polyimide (PI)-coated optical fibers based on Brillouin Brillouin optical frequency domain analysis (BOFDA). Different non-linear machine learning algorithms are employed, namely polynomial regression, decision trees and artificial neural networks (ANNs), and their discrimination performance is benchmarked against that of the conventional linear regression. The performance is evaluated using leave-one-out cross-validation to ensure that the models are reliable and able to generalize well on new data. We show that nonlinear machine learning algorithms outperform the conventional linear regression and thus could pave the way towards simultaneous cost-effective temperature and humidity distributed sensing, which has the potential to find attractive new applications in the field of civil and geotechnical engineering, from structural health monitoring of dikes and bridges to subsea cables and long pipelines corrosion detection.

关键词： distributed Brillouin sensing machine learning artificial neural networks Brillouin optical frequency domain analysis distributed fiber-optic sensors humidity sensing simultaneous temperature and humidity sensing

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Development of a new plasmonic transducer for the detection of biological species 7

Development of a new plasmonic transducer for the detection ...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Laffont, Emilie Crespo-Monteiro, Nicolas Berini, Pierre Jourlin, Yves Univ Lyon Lab Hubert Curien UMR CNRS 5516 18 Rue Prof Benoit Lauras F-42000 St Etienne France Univ Ottawa Sch Elect Engn & Comp Sci 800 King Edward Ave Ottawa ON K1N 6N5 Canada Univ Ottawa Ctr Res Photon 25 Templeton St Ottawa ON K1N 6N5 Canada Univ Ottawa Dept Phys 150 Louis Pasture Ottawa ON K1N 6N5 Canada

ISBN: (纸本)9781510651555;9781510651548

An optical switch configuration is demonstrated as a promising approach for the detection of proteins based on preliminary work consisting of the detection of variations in the bulk refractive index. The device comprises a corrugated dielectric grating covered by chrome and gold, featured by a high depth-to-period ratio, allowing switching SPR detection. This grating is placed inside a fluidic cell through which solutions are injected. Bulk sensing is demonstrated by the successive injection of four mixtures of water and glycerol in different concentrations. The refractive indices of these solutions have a 2x10(-3) RIU increment. Their detection has been obtained with a signal-to-noise ratio of 735.

关键词： Surface plasmon resonance grating biosensors surface functionalization

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Machine-learning based analysis of time sequences for multiplexed microresonator sensor 7

Machine-learning based analysis of time sequences for multip...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Saetchnikov, Anton Tcherniayskaia, Elina Saetchnikov, Vladimir Ostendorf, Andreas Ruhr Univ Bochum Chair Appl Laser Technol Univ Str 150 D-44801 Bochum Germany Belarusian State Univ Phys Dept Nezavisimosti Ave 4 Minsk 220030 BELARUS Belarusian State Univ Radio Phys Dept Kurchatov St 5 Minsk 220064 BELARUS

ISBN: (纸本)9781510651555;9781510651548

This paper discusses an application of machine-learning solution for processing of the dynamical sensing responses collected with a multiplexed microresonator detector. Performance of a long short-term memory network (LSTM) out of bidirectional and dropout layers is analyzed on example of the experimental data collected for a temporal gradient of the local refractive index. We experimentally demonstrate the possibility for analyte parameters prediction with accuracy of > 99% based on a set of complex non-linear highly specific time sequences of the intensities radiated by the microcavities which is obtained within a timescale 4 times shorter than required to reach the steady state. Optimization possibilities in terms of the number of microresonator signals to consider for the LSTM network training along with the complexity of its architecture are analyzed.

关键词： optical microresonator sensing machine learning whispering gallery mode multiplexing

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Utilization of optical properties of magnetic fluid for detecting the presence of magnetic fields 7

Utilization of optical properties of magnetic fluid for dete...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Tarjanyi, Norbert Kacik, Daniel Univ Zilina Fac Elect Engn & Informat Technol Dept Phys Univ 8215-1 Zilina 01026 Slovakia

ISBN: (纸本)9781510651555;9781510651548

In the contribution, we present the preliminary results of an investigation of the effect of a magnetic field applied on a thin magnetic fluid layer placed between two crossed plane polarizers on its transmittance in the visible spectral range. We used samples of two different thicknesses and a supercontinuum white light source for investigation. The magnetic field was generated by a solenoid with an iron core and applied parallel to the magnetic fluid surface and at the same time, perpendicular to the direction of light propagation. We changed the strength of the magnetic field, its direction with respect to the orientation of the polarization planes of the polarizers and recorded the intensity of light transmitted through the samples. A quite strong effect of the magnetic field on the transmittance of the magnetic fluid thin layer placed between two crossed plane polarizers was observed which is promising for sensor applications utilizing the presence of an external magnetic field.

关键词： Magnetic fluid magnetic field polarization birefringence

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Railway monitoring system using optical fiber Fabry - Perot interferometer 7

Railway monitoring system using optical fiber Fabry - Perot ...

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Kacik, Daniel Martincek, Ivan Tarjanyi, Norbert Goraus, Matej Univ Zilina Zilina Dept Phys Univ 8215-1 Zilina 01026 Slovakia

ISBN: (纸本)9781510651555;9781510651548

Various parameters are measured to increase the safety of train operation and monitor the railway infrastructure. This contribution presents a monitoring system using an optical fiber Fabry-Perot interferometer for speed measurement. The speed of the train was determined from the known distance of two sensors placed on the foot of the rail rather than the known geometry of the train. During the measurement campaign on the railway line in Slovakia, more than 70 train passages were determined. The speeds (from 15 km/h to 67 km/h) were divided into five groups and compared with the speeds determined by a piezoelectric-based sensor. Easy installation, a simple evaluation of the measured signal, and low sensor production costs, make the proposed sensor a good candidate for railway monitoring applications.

关键词： Fabry - Perot interferometer railway monitoring optical sensor optical fiber

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partially-coated TFBGs for biosensing 7

Partially-coated TFBGs for biosensing

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conference on optical sensing and detection vii part of spie photonics europe conference

作者： Zhu, Tianbo Chah, Karima Loyez, Mederic Caucheteur, Christophe Univ Mons Electromagnetism & Telecommun Dept 31 Blvd Dolez B-7000 Mons Belgium

ISBN: (纸本)9781510651555;9781510651548

This study investigates a fiber-optic biosensor based on a tilted fiber Bragg grating (TFBG) partially-coated with a thin gold film on its axis and around its cross-section. The effects induced in the TFBG transmitted amplitude spectrum were analyzed for different input light directions for surrounding refractive index (SRI) changes in the range 1.3356 - 1.3370. partially-coated gratings present the potential ability to sense both volume and surface refractive index changes, which is interesting in biosensing to enhance the signal-to-noise ratio. The gold film was bio-functionalized by human epidermal growth factor receptor (HER2) aptamers using thiol chemistry. The detection of HER2 proteins (a relevant cancer biomarker) at 10(-9) g/mL, 10(-8) g/mL and 10(-6) g/mL demonstrated the advantage to identify environmental perturbations through the bare area of the TFBG. The non-specific drifts that could exist in samples are eliminated and a wavelength shift only related to the surface modification is obtained.

关键词： partially-coated tilted FBGs bio-sensing

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