- 标题
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- 实验方案
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Axial Micro-Strain Sensor Based on Resonance Demodulation Technology Via Dual-Mode CMECF
摘要： This paper firstly and experimentally demonstrates an in-fiber axial micro-strain sensing head, combined with a Mach-Zehnder interferometer (MZI) based on the concentric multilayer elliptical-core fiber (CMECF). This MZI with a high extinction ratio (about 15 dB) is successfully achieved with a CMECF-single mode fiber-CMECF (CSC) structure. The MZI sensor theory and the resonance demodulation technology are systematically described in this paper. In this CSC structure, two sections of the CMECF have a role as the mode generator and coupler, respectively. LP01 and LP11 even, which have similar excitation coefficients, are two dominated propagating mode groups supported in the CMECF. On account of the distinct dual-mode property, a good stability of this sensor is realized. The detected resonance in the MZI shifts as the axial micro-strain variated due to the strong interaction between higher order modes. High sensitivity of ~1.78 pm/με is experimentally achieved within the range of 0 με ? 1250 με, meanwhile, the intensity fluctuation is below 0.38 dB.
关键词： MZI,fiber sensor,Few-mode fiber,axial micro-strain
更新于2025-11-28 14:23:57
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A curvature sensor based on single mode-no-core-twisted single mode fiber structure
摘要： A high sensitivity curvature sensor based on single mode-no-core-twisted single mode (SNTS) fiber structure is proposed. The configuration is simply formed by twisting a section of single mode fiber (SMF) in the single mode-no-core-single mode structure. Due to the twist is applied, the cladding mode excited in the SMF can be recoupled into the core. The core modes and cladding modes excited in the same fiber form a Mach-Zehnder interference (MZI) which is sensitive to the curvature change. A high sensitivity of 16.28 nm/m?1 with a good linearity has been achieved in the range of 0.96–1.92 m?1, and the repeatability of the curvature sensor is 3.6 × 10?3 nm/m?1. The temperature sensitivity is 0.03 nm/°C within the temperature range from 30 to 100 °C.
关键词： Single mode-no-core-twisted,Curvature sensor,Fiber,Mach-Zehnder interference
更新于2025-11-28 14:23:57
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Non-invasive smart monitoring system based on multi-core fiber optic interferometers
摘要： A smart monitoring system based on fiber-optic interferometers using multi-core fiber (MCF) is presented in this paper. Interference among cores in the seven-core fiber (SCF) was introduced by using multi-mode fiber (MMF) coupling and experimental setup was designed to collect the data of user on bed for processing. With optimized algorithm, three body activities, including on the bed, off the bed and body movement, can be identified successfully. For further processing on collected data, respiration of the user can also be obtained. The smart monitor is contactless and non-invasive which is user-friendly and secure.
关键词： Smart monitoring system,Multi-core fiber,fiber sensor
更新于2025-11-28 14:23:57
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Simultaneous Measurement of Refractive Index and Temperature Based on a Peanut-Shape Structure In-Line Fiber Mach–Zehnder Interferometer
摘要： We proposed a peanut-shape structure in-line fiber Mach–Zehnder interferometer (MZI) for simultaneous measurement of refractive index (RI) and temperature. Two kinds of demodulation methods were investigated and compared. The wavelength-related and phase-related character matrices of the in-line fiber MZI were determined for simultaneous measurement of RI and temperature, respectively. For the wavelength-related measurement, the highest temperature and RI sensitivities were 0.0709 nm/°C and ?47.3620 nm/RIU, respectively. The phase-related measurement was with a lower measuring errors compared to the wavelength-related measurement, and the highest temperature and RI sensitivities were ?0.0632rad/°C (0.0764 nm/°C) and 77.0995rad/RIU (?93.2429 nm/RIU), respectively. The minimum measuring errors of temperature and RI were 0.3800 °C and 0.0004 RIU, respectively.
关键词： Mach–Zehnder interferometer,simultaneous measurement of refractive index and temperature,Optical fiber sensor,peanut-shape structure
更新于2025-11-28 14:23:57
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Fiber Brag grating monitoring of a morphing wing based on a polyvinyl chloride reinforced silicone substrate
摘要： Here, the three-dimensional (3D) shape monitoring of polyvinyl chloride (PVC)-reinforced silicone substrate for a morphing wing is detailed, using Fiber Bragg grating (FBG) sensors. An optical ?ber FBG sensor was embedded into a soft silicone substrate, which was glued onto the surface of a PVC substrate. This substrate was aligned with the morphing wing’s ?exible ribs of the. Sensing experiments were carried out both with and without the PVC reinforced silicone substrate, and the sensitivity and repeatability of the two sensors were compared. The PVC-reinforced silicone substrate sensor was calibrated using standard curvature calibration blocks to obtain a relationship between wavelength shift and the bending curvature of the PVC-reinforced silicone substrate, and the wing shape was reconstructed at di?erent deformation states. Several wing shapes were also reconstructed using a precise visual measurement system. Comparing the FBG sensing method with this visual measurement system demonstrated the e?ectiveness of the FBG method proposed here. Its maximum error was < 3%, so it can successfully sense the shape of a PVC-reinforced silicone substrate for morphing wing. The FBG sensing method therefore has potential for applications in shape monitoring in the ?elds of soft robotics and ?exible biosensor monitoring.
关键词： PVC reinforce silicone substrate,Wing shape monitoring,Soft sensor,FBG sensing
更新于2025-11-28 14:23:57
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Graphene-Based Waist-Enlarged Optical Fibre Sensor for Measurement of Sucrose Concentration
摘要： A novel sucrose sensor based on graphene-coated optical fibre with waist-enlarged bitapers as Mach-Zehnder interferometer is proposed and demonstrated. The sensor is formed by arc fusion splicing a photonic crystal fibre (PCF) sandwiched between two single-mode fibres (SMFs). The intermodal interference is achieved by two waist-enlarged fibre tapers at the coupling points between the PCF and two SMFs. The result shows that the dips of transmission spectra exhibit blue shift with the concentration increase of the sucrose, and the sensor has a high linear response (R2 = 0.98233) to sucrose with an excellent sensitivity of 3.36 pm/ppm in the range of 0–230 ppm. Additionally, the surface adsorption mechanism is also discussed. Such easily fabricated, cost-effective and small volume fibre interferometer could be used for sucrose sensing applications.
关键词： Graphene,Sucrose Sensor,Blue Shift,Waist-Enlarged Bitapers,Mach-Zehnder Interferometer
更新于2025-11-28 14:23:57
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A Speckle-Free Angular Interrogation SPR Imaging Sensor Based on Galvanometer Scan and Laser Excitation
摘要： A speckle-free fast angular interrogation surface plasmon resonance imaging (SPRi) sensor based on a diode-pumped all-solid-state laser and galvanometer is reported in this work. A bidirectional scan using a galvanometer realizes the fast scanning of the incidence angle. The experimental results showed that the time needed for completing an SPR dip measurement was decreased to 0.5 s. And through cascading an immovable diffuser and two diffusers rotating in opposite directions, laser speckle was eliminated. The dynamic detection range and the sensitivity reached 4.6 × 10?2 and 1.52 × 10?6 refractive index unit (RIU), respectively, in a 2D array sensor when the angle scanning range was set as 7.5°. More importantly, the results demonstrated that the angular interrogation SPR imaging sensor scheme had the capability to perform fast and high-throughput detection of biomolecular interactions at 2D sensor arrays.
关键词： Speckle-free,Biomolecule interaction,Angular interrogation,Surface plasmon resonance imaging sensor
更新于2025-11-25 10:30:42
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Hydrogen peroxide detection with a silver nanoparticle grating chip fabricated by plasmonic plating
摘要： An optical detection of hydrogen peroxide (H2O2) is proposed, using grating structures of silver nanoparticles (AgNPs). Periodic line structures of AgNPs are deposited on a gold nanoparticle (AuNP)-decorated glass plate using an interference exposure with a green laser beam, based on the plasmonic plating method. This AgNP grating chip diffracts incident light, and the diffraction efficiency is dependent on the amount of AgNPs. By applying a drop of H2O2 solution onto the chip, the diffraction intensity declines due to the autocatalytic decomposition of AgNPs. A portable measurement system of the diffraction intensity change is constructed, and the H2O2 detection in the concentration range 6.7 – 668 μmol/L is performed in 2 min simply by dropping the H2O2 solution onto the substrate.
关键词： silver nanoparticles,plasmonic plating,optical sensor,hydrogen peroxide detection,diffraction grating
更新于2025-11-25 10:30:42
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Performance Improvement of a Nonvolatile UV TD Sensor Using SAHAOS with a High Temperature Annealed, Partially Nano-Crystallized Trapping Layer
摘要： This study shows that a silicon–aluminum oxide–hafnium aluminum oxide-silicon oxide–silicon capacitor device with a high temperature pre-metal-anneal-treated and partially-nanocrystallized hafnium aluminum oxide, (hereafter PNC-SAHAOS) can successfully increase the performance of a nonvolatile ultraviolet radiation total dose (hereafter UV TD) sensor. The experimental results show that the UV-induced threshold voltage VT shift of PNC-SAHAOS was 10 V after UV TD 100 mW·s/cm2 irradiation. The UV-induced charge density of PNC-SAHAOS is almost eight times that of amorphous silicon–aluminum oxide–silicon nitride–silicon dioxide–silicon SANOS. Moreover, the charge fading rate of ten-years retention on PNC-SAHAOS, even at 85 ?C, is below 10%. At 85 ?C, the charge fading rate of ten-years retention on amorphous SANOS is almost twice that on PNC-SAHAOS. These results strongly suggest that PNC-SAHAOS could be the most promising candidate for next-generation nonvolatile UV TD sensor technology.
关键词： sensor,UV,SOHOS,TD,nano
更新于2025-11-25 10:30:42
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Fracto-mechanoluminescence in Mn/Cu doped ZnS induced by steel ball and cylindrical piston
摘要： Herein, we present a comparison of fracto-mechanoluminescence (FML) from ZnS: Mn and ZnS:Cu phosphors prepared by solid state reaction (SSR) route. The FML emitted by two phosphors was compared in terms of its dependence on time and velocity. The FML intensity initially increases with time attains a peak value followed by decrease at still longer times. Peak ML intensities in both the cases are found to linearly increase with impact velocity and total ML intensity linearly increases with mass of the phosphor samples. ML and photoluminescence (PL) spectra of ZnS: Mn and ZnS: Cu phosphors are recorded to lie at 540 nm and 580 nm, respectively.
关键词： Sensor,ZnS: Cu,ZnS: Mn,Mechanoluminescence,Phosphors
更新于2025-11-21 11:18:25