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- 实验方案
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[IEEE 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Vladivostok, Russia (2018.10.3-2018.10.4)] 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Experimental Study of the Stress-Strain State Features of Outlet Guide Vane Made From Polymer Composite Material Using Fiber Optic Sensors
摘要： An estimation technique for the stress-strain state of the outlet guide vane design of an aircraft propulsion system made of polymer composite materials (PCM) using fiber-optic sensors is proposed. Fiber-optic sensors allow creating details with the possibility of self-diagnosis and forecasting the resource of work. This issue is particularly relevant when using PCM in highly loaded aircraft engine elements. The object of the study is the outlet guide vane (OGV) made of an equally strong carbon cloth on an epoxy binder. The tests were carried out on a universal servo-hydraulic machine. The data from fiber-optic sensors was carried out using an interrogator ASTRO X327. The comparison of the experiment and the numerical calculation were performed using the software package ANSYS.
关键词： polymer composite material,fiber optic sensors,numerical calculations,stress-strain state
更新于2025-09-23 15:23:52
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Agar-coated fiber Bragg grating sensor for relative humidity measurements: influence of coating thickness and polymer concentration nm
摘要： The importance of humidity control is spreading through a broad spectrum of applications, from food and pharmaceutical industries to biomedical and chemical fields. During the last decades, the growing interest in fiber Bragg gratings (FBG) led to new approaches and applications for the humidity measurement by means of the deposition of hygroscopic materials on gratings. The influence of the coating material and its features such us coating thickness (tk) and concentration (wt%) on static and dynamic metrological properties have been investigated in the literature. In this study, four agar-coated FBG sensors for humidity measurements have been fabricated, and the influence of tk and wt% on the sensors’ sensitivity and response time has been experimentally assessed. Sensitivity increases with tk and wt%: for instance, at 1 wt% it was 0.0024 nm·%-1 and 0.0052 nm·%-1 for tk=87 μm and tk=212 μm, respectively. Results showed that also the response time increased with tk and wt%: for instance, at 1 wt% it was 56.7 s and 107.6 s for tk=87 μm and tk=212 μm, respectively.
关键词： Moisture sensitive polymers,Hygroscopic materials,Relative humidity sensing,Fiber Bragg grating sensors,Fiber optic sensors
更新于2025-09-23 15:22:29
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S fiber taper-based fiber loop ring-down refractometer
摘要： A fiber-optic refractive index (RI) sensor based on fiber loop ring-down (FLRD) technique with an S fiber taper (SFT) structure is proposed and experimentally investigated. The SFT is served as an in-line Mach–Zehnder interferometer and inserted into a compensated fiber loop for RI measurement. By optimizing the parameters of the fiber loop, the quality of the ring-down signals is improved effectively. The surrounding refractive index can be conveniently measured by interrogating the ring-down time of the fiber loop. The experimental results demonstrate that the proposed sensor has a high sensitivity of ?3128.954 μs/RIU in the measurement range of 1.3330–1.3682. The proposed RI sensor combines the specialties of SFT interferometer and FLRD technology, which could be a good candidate in applications.
关键词： Fiber-optic sensors,fiber loop ring-down,S fiber taper,refractive index
更新于2025-09-23 15:22:29
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In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending
摘要： A highly sensitive directional bending sensor based on a three-core fiber (TCF) Mach-Zehnder interferometer (MZI) is presented in this study. This MZI-based bending sensor was fabricated by fusion-splicing a section of TCF between two single-mode fibers (SMF) with core-offset. Due to the location of the core in the TCF, a bend applied to the TCF-based MZI led to an elongation or shortening of the core, which makes the sensor suitable for directional bending measurement. To analyze the bending characteristics, two types of TCF-based sensors, with the fusion-spliced core located at different positions between the SMFs, were investigated. A swept source was employed in the measurement technique. The experimental results showed that, for the two types of sensors in this setup, the bending sensitivities of the two sensors were 15.36 nm/m?1 and 3.11 nm/m?1 at the bending direction of 0?, and ?20.48 nm/m?1 and ?5.29 nm/m?1 at the bending direction of 180?. The temperature sensitivities of the two sensors were 0.043 nm/?C and 0.041 nm/?C, respectively. The proposed sensors are compact, versatile, inexpensive to fabricate, and are expected to have potential applications in biomedical sensing.
关键词： Mach-Zehnder interferometer,fiber optic sensors,bending direction,three-core fiber,bending sensitivities
更新于2025-09-23 15:22:29
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Performance study of surface plasmon resonance and lossy mode resonance based fiber optic sensors utilizing silver and indium oxide layers: An experimental investigation
摘要： This study presents here the experimental investigations on a surface plasmon resonance (SPR)/lossy mode resonance (LMR) based fiber optic sensors coated with silver and indium oxide layers. Different sensing probes have been fabricated by coating (i) a single layer of indium oxide, (ii) a single layer of silver and (iii) a double layer of indium oxide and silver (with different thicknesses) symmetrically onto to the bare core of silica fiber. The sensitivity of these fiber optic sensing probes towards surrounding region refractive index variations are determined using different concentrations of sucrose solutions. It was found that sensor probe fabricated with coating of 100 nm thickness of indium oxide was two times more sensitive than the conventionally used fiber optic sensing probe coated with only silver layer. The sensitivity of a double layer coated fiber optic sensor with various thicknesses of indium oxide and silver layers is in between the two extremes of the sensitivities. This study will find suitable applications in the field of chemical and biochemical sensing. The drawbacks of silver coatings and the advantages of LMR supporting indium oxide have also been discussed.
关键词： Surface plasmons,Sensitivity,Lossy mode resonances,Thin films,Fiber optic sensors,Detection accuracy,Indium oxide
更新于2025-09-23 15:21:21
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Feasibility Analysis Using Load Profile Modeling Scenarios of Achieving Peak Shaving Using Grid-Tied PV for a Small Utility in Boone, North Carolina
摘要： The distributed Brillouin analysis of an 8.8-km-long fiber with a spatial resolution of 2 cm is presented. All 440 000 potential resolution points are addressed in the measurement. A 7-cm-long hot-spot, located toward the output end of the pump wave, is properly identified in the experiment. The experimental error in the estimate of the local values of the Brillouin frequency shift is ±3.5 MHz. The analysis is based on the simultaneous generation and analysis of Brillouin interaction in more than 2000 correlation peaks, induced by periodic phase modulation of the pump and signal waves. The Brillouin amplifications at individual peaks are resolved using radar-like coding of pump wave magnitude by a 10000 bit-long aperiodic sequence, and postdetection compression at the receiver end. Extensive numerical simulations of the Brillouin interactions over kilometers of fiber with centimeter resolution are reported as well. The results are at the state of the art for high-resolution distributed Brillouin sensors.
关键词： All-optical signal processing,fiber-optic sensors,correlation-domain analysis,stimulated Brillouin scattering,distributed fiber sensors,sequence compression
更新于2025-09-23 15:19:57
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The Influence of Structural Parameters on the Surface Plasmon Resonance Sensor Based on a Side-polished Macrobending Plastic Optical Fiber
摘要： In this paper the influences of the structured parameters, namely, metal layer thickness, polished depth, macrobending radius and polished angle on the refractive index sensing performances for the side-polished macrobending plastic optical fibers (POFs) based surface plasmon resonance (SPR) sensors were investigated. A simple and controllable rotary grinding technique was introduced to fabricate the proposed sensor. The performances of sensitivity, resolution and full width at half maximum (FWHM) were evaluated. The results have demonstrated that the SPR sensor performances could be improved by changing the structural parameters, and the highest sensitivity obtained was 4793.1 nm/RIU when the external refractive index was 1.410. The proposed POFs based SPR sensors are easy fabrication, robust, and compact in size, which are useful for chemical and biological sensing.
关键词： plastic optical fibers,side-polished macrobending structure,Fiber optic sensors,surface plasmon resonance
更新于2025-09-19 17:13:59
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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) - Anti-resonant reflecting effect in large-core hollow-core photonic crystal fiber for temperature sensing
摘要： Optical fiber sensors based on anti-resonant reflecting effect have attracted widespread attention in recent years. Here, a compact and robust all-fiber device is proposed and developed based on anti-resonant reflecting effect. A double-layered Fabry-Pérot resonator is built by infiltrating alcohol into two adjacent cladding holes of a new large-core hollow-core photonic crystal fiber. Due to the thermo-optic effect of alcohol, the temperature sensitivity of -0.184 nm/oC is achieved. This device can be good candidates in the field of physical or bio/chemical sensing.
关键词： Anti-resonant reflecting effect,Hollow core fiber,Fiber optic sensors
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) - Graphene enhanced intra-resonator biochemical detection with individual molecule sensitivity and selectivity
摘要： Partially-reduced graphene oxide (prGO) inner-coated and fiber-calibrated Fabry-Perot dye resonator for biochemical detection enables the functionalized FRET-gain-assistance and intermode heterodyne interference, we achieve individual molecule sensitivity for dopamine, nicotine and ssDNA.
关键词： Biochemical detection,Fiber optic sensors,Graphene,Microresonator
更新于2025-09-16 10:30:52
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Installation for investigation of optical and mechanical system of fiber optical sensors of parameters of liquid or air flows
摘要： A special measuring unit has been developed for experimental studies of micro-optomechanical systems of fiber-optic micro-angle transducers based on a bellows and micrometer, which are the basic elements of fiber-optic sensors of aerodynamic angles, imitating the physical effect of the flux on the sensing element.
关键词： fiber-optic sensors,bellows,micrometer,aerodynamic angles,micro-optomechanical systems
更新于2025-09-16 10:30:52