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High Sensitivity Refractive Index Sensor Based on the Excitation of Long-Range Surface Plasmon Polaritons in H-Shaped Optical Fiber
摘要： In this paper, we propose and numerically analyze a novel design for a high sensitivity refractive index (RI) sensor based on long-range surface plasmon resonance in H-shaped microstructured optical ?ber with symmetrical dielectric–metal–dielectric waveguide (DMDW). The in?uences of geometrical and optical characteristics of the DMDW on the sensor performance are investigated theoretically. A large RI analyte range from 1.33 to 1.39 is evaluated to study the sensing characteristics of the proposed structure. The obtained results show that the DMDW improves the coupling between the ?ber core mode and the plasmonic mode. The best con?guration shows 27 nm of full width at half maximum with a resolution close to 1.3 × 10?5 nm, a high sensitivity of 7540 nm/RIU and a ?gure of merit of 280 RIU?1. Additionally, the proposed device has potential for multi-analyte sensing and self-reference when dissimilar DMDWs are deposited on the inner walls of the side holes. The proposed sensor structure is simple and presents very competitive sensing parameters, which demonstrates that this device is a promising alternative and could be used in a wide range of application areas.
关键词： optical ?ber sensor,surface plasmon polariton (SPP),surface plasmon resonance,optical waveguides,refractive index (RI) sensor
更新于2025-09-23 15:19:57
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Gold-Film-Thickness Dependent SPR Refractive Index and Temperature Sensing with Hetero-Core Optical Fiber Structure
摘要： A simple hetero-core optical ?ber (MMF-NCF-MMF) surface plasmon resonance (SPR) sensing structure was proposed. The SPR spectral sensitivity, full width of half peak (FWHM), valley depth (VD), and ?gure of merit (FOM) were de?ned to evaluate the sensing performance comprehensively. The e?ect of gold ?lm thickness on the refractive index and temperature sensing performance was studied experimentally. The optimum gold ?lm thickness was found. The maximum sensitivities for refractive index and temperature measurement were obtained to be 2933.25 nm/RIU and ?0.91973 nm/? C, respectively. The experimental results are helpful to design the SPR structure with improved sensing performance. The proposed SPR sensing structure has the advantages of simple structure, easy implementation, and good robustness, which implies a broad application prospect.
关键词： hetero-core ?ber structure,optical ?ber sensor,surface plasmon resonance,refractive index sensing,temperature sensing
更新于2025-09-19 17:13:59
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Leak monitoring and localization in baghouse filtration system using a distributed optical fiber dynamic air pressure sensor
摘要： Coherent Rayleigh backscattering noise produced by the detection of the dynamic air?ow applied to a standard optical ?ber is proposed to monitor and locate the potential broken fabric bags within a baghouse ?ltration system with a sensing distance of 2 km. The optical ?ber cable hangs freely inside the fabric bags with small leak holes. Experimental results demonstrated that the proposed distributed optical air pressure sensor is capable of identifying broken bags via the measurement of air?ow perturbation applied onto the optical ?ber cable. Field test at a baghouse ?ltration test platform was conducted and results showed that the location accuracy of the system is less than ± 5 m with a detectable hole diameter of 0.3 cm and a recognition rate of ~87.6% measured by Adaboost-Support Vector Machine (ADA-SVM) method. A false alarm rate of 9% for this particular leak diameter is achieved.
关键词： Optical ?ber sensor,Air pressure monitoring,Leak detection and localization,Air ?ow,Adaboost
更新于2025-09-19 17:13:59
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Graphite lithiation and capacity fade monitoring of lithium ion batteries using optical fibers
摘要： Increasing the e?ciency and safety of battery management systems may require internal monitoring of lithium ion batteries. In this work, we present an analysis of the interaction between ?ber-optic evanescent wave sensors (FOEWS) and graphite particles within a lithium ion battery over multiple cycles. Through slow charging and long rest periods, the FOEWS signal has shown sensitivity to lithium concentration at the surface of graphite particles by demonstrating a response to the slow di?usion of lithium ions within graphite particles during rest periods (i.e. relaxation of the electrode). The slope of the FOEWS signal during a full charge is found to exhibit three distinct peaks that occur within lithiated graphite's stage transitions zones IV, III and II. Deviation from the observed three peak trend correlates with signi?cant battery capacity fade and thus indicate the sensors ability to detect capacity fade in real-time. During experiments, signi?cant deviations in the slope during charging occurred at about ~5% SOC and minor disturbances to the slope were observed at ~80% SOC, which supports limiting the depth of charge and discharge to avoid accelerated capacity fade. These results deepen our understanding of the FOEWS's interaction with lithium ion batteries and supports the development of algorithms that optimize the control and monitoring of graphite lithiation with the aim of achieving safer operation as well as maximizing capacity and battery life.
关键词： Optical ?ber sensor,Lithium ion battery,State of charge,Graphite,Capacity fade,Signal analysis
更新于2025-09-19 17:13:59
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Large-Range, Highly-Sensitive, and Fast-Responsive Optical Fiber Temperature Sensor Based on the Sealed Ethanol in Liquid State Up to its Supercritical Temperature
摘要： A highly-sensitive and fast-responsive optical ?ber temperature sensor based on the sealed liquid ethanol with a large detection range was proposed. The ethanol was injected into the ?ber Fabry-Perot (FP) micro-cavity through the thin core silica capillary tube (SCT), which was then spliced to a section of singe mode ?ber. A section of air core was formed in the thin core SCT near the splicing position. If the volume of the sealed ethanol is much larger than that of the air core, the ethanol can remain liquid state until its supercritical temperature (about 243 °C) at which the ethanol becomes supercritical state. The temperature sensitivity of proposed sensor with a volume ratio 2.89 of ethanol to air reaches –497.6 pm/ °C with an upper detection limit of 220 °C. Meanwhile, the order of the interference fringe can be distinguished by monitoring the transmission loss of the sensor, which can assist wavelength demodulation in the large detection range. Besides, the proposed ?ber temperature sensor is with the advantages of fast response (less than 1 s for the temperature variation of about 90 °C) and good repeatability.
关键词： liquid ethanol,interferometry,Optical ?ber sensor,temperature
更新于2025-09-11 14:15:04