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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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Temperature and voltage sensing based on a tapered optical fiber device with the liquid crystal cladding
摘要： This paper presents the results of light transmission in a tapered optical ?ber surrounded by the cladding formed by a nematic liquid crystal (LC) E7 mixture in a classical LC cell con?guration where embedded optical ?ber axis is perpendicular, parallel or twist with regard to rubbing directory of the LC orienting layers. The LC cladding e?ective refractive index is modulated by the electric ?eld. Observations were done for di?erent modulation frequencies of the driving electric ?eld in a temperature range of T = 20–50 °C. Light transmission through the device while driving an LC medium was measured in a broad wavelength range of λ = 500–1000 nm. Spectral characteristics of the transmission, as well as response times (switching on and o?), were estimated.
关键词： Tapered ?ber,Liquid crystal,Temperature sensing,Voltage sensing,Optical ?ber device
更新于2025-09-19 17:13:59
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Yellow/Orange-Emitting ABZn2Ga2O7:Bi3+ (A = Ca, Sr; B = Ba, Sr) Phosphors: Optical Temperature Sensing and WLED Applications
摘要： Recently, there is growing interest in developing Bi3+-activated luminescence materials for optoelectronic applications. Herein, new yellow/orange-emitting ABZn2Ga2O7:Bi3+ (ABZGO, A = Ca, Sr; B = Ba, Sr) phosphors with tunable optical properties are synthesized by alkaline earth cation substitution. When Sr2+ substitutes Ca2+ and Ba2+, the excitation wavelength has a red shift from 325 to 363 nm, matching well with the n-UV chips based WLEDs. CaBaZn2Ga2O7:0.01Bi3+ (CBZGO:0.01Bi3+) exhibits two evident emission peaks at 570 and 393 nm originating from the respective occupation of Ca and Ba sites by Bi3+ ions. The optical tuning of CBZGO:Bi3+ phosphor is achieved by changing Bi3+ doping content and excitation wavelength based on the selected site occupation. Differently, both SrBaZn2Ga2O7:0.01Bi3+ (SBZGO:0.01Bi3+) and Sr2Zn2Ga2O7:0.01Bi3+ (SZGO:0.01Bi3+) phosphors exhibit a single broad emission band, peaking at 600 and 577 nm, respectively. Two different Bi3+ sites are also verified respectively in SBZGO and SZGO hosts by the Gaussian fitting of the asymmetric PL spectra and lifetime analysis. The different luminescence behaviors of ABZGO:0.01Bi3+ phosphors should be ascribed to the synergistic effect of centroid shift, crystal-field splitting and Stokes shift. Moreover, the temperature-dependent PL spectra reveal that cation substitutions of Sr2+ for Ca2+ and Ba2+ can efficiently improve the thermal stability of ABZGO:0.01Bi3+ phosphors. In view of different thermal responses to various temperature for two emission peaks of CBZGO:0.01Bi3+ phosphor, an optical thermometer is designed and has a good relative sensitivity (Sr = 1.453% K-1) at 298 K. Finally, a WLED with CRI = 97.9 and CCT = 3932 K is obtained by combining SZGO:0.01Bi3+ and BAM:Eu2+ phosphors with a 370 nm n-UV chip, demonstrating that SZGO:0.01Bi3+ is an excellent yellow-orange-emitting phosphor for n-UV WLED devices. This work stimulates the exploration of optical tuning by cation substitution to obtain remarkable luminescence materials for optical temperature sensing and WLED applications.
关键词： optical temperature sensing,WLED applications,optical tuning,Bi3+-activated,thermal stability,luminescence materials
更新于2025-09-19 17:13:59
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Parallel Double-FPIs Temperature Sensor Based on Suspended-Core Microstructured Optical Fiber
摘要： A configuration based on a parallel double Fabry–Perot interferometers (FPIs) is experimentally demonstrated to enhance temperature sensitivity by Vernier-effect. Two separated FPIs constructed by suspended-core microstructured optical fiber (SCMF) are connected by a 3-dB coupler to form a parallel structure. FPI-2 is used for temperature sensing, while FPI-1 as a reference. With the temperature increasing from 40 oC to 220 oC, both the fine interference fringes and envelope have a linear redshift. This parallel double-FPIs configuration shows an enhanced temperature sensitivity of 153.8 pm/oC with an amplification factor M = 14.6. Moreover, since the free reference FPI-1 is away from the temperature sensing environment, this simple and novel parallel double-FPIs configuration provides good reversibility and stability during the heating and cooling processes.
关键词： suspended-core microstructured optical fiber,Vernier-effect,parallel structure,temperature sensing
更新于2025-09-16 10:30:52
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808nm‐light excited near‐infrared luminescent lanthanide metal‐organic frameworks for highly sensitive physiological temperature sensing
摘要： Ongoing demand for the accurate self-calibrated non-invasive thermometers for micro-/nano-scale applications, particular biomedical diagnosis, is driving the development of temperature sensors. Here we present a new type of lanthanide metal-organic framework having near-infrared absorption and near-infrared emission features. It is based on efficient Nd3+-to-Yb3+ energy transfer in 808 nm photo excitation. Our results show that the ratiometric parameter of Nd0.5Yb0.5TPTC can deliver good exponential type luminescence response to temperature in the physiological regime (293~328 K) with high relative sensitivity and accurate temperature resolution, as well as good biocompatibility and chemical stability. Such lanthanide-based materials are especially useful in the biomedical applications.
关键词： Temperature sensing,Near-infrared,luminescent,Nd3+/Yb3+-codoped,MOFs,Ratiometric
更新于2025-09-12 10:27:22
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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) - Temperature and Salinity Sensing Experiment Based on Microfiber Coupler Combined SAGNAC Loop
摘要： A microfiber coupler conbined SAGNAC loop is fabricated temperature and salinity sensing experiment. The experimental results show that the sensitivity is high, and its dynamic range can meet the marine environment monitoring demand.
关键词： temperature sensing,salinity,SAGNAC loop,microfiber coupler
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Long Length Fibre Fabry-Perot Interferometers and their Applications in Fibre Characterization and Temperature Sensing
摘要： Since the free spectral range (FSR) of a fibre Fabry-Perot (f-FP) is the reciprocal of the time delay inside the interferometer, it can be used for the precise measurement of fibre properties (chromatic dispersion when measured as a function of wavelength, birefringence, etc.) or for the measurement of environmental changes (such as temperature, pressure, stress, etc.) which alter the fibre’s parameters. Here we propose a method to precisely measure the FSR of long-length f-FP based on an incoherent optical source and RF beat signal analysis. We built a 7-m long f-FP made of a single mode fibre (SMF) and investigated the use of several algorithms to evaluate the FSR. When measuring over time, we achieved an excellent accuracy down to 2.4 Hz (corresponding to a relative error of 1.5× 10??). To demonstrate its use in sensing application, we varied the f-FP temperature and monitored the associated FSR. We achieved a sensitivity of 345 Hz/K, leading to an excellent temperature resolution below 10 mK. Additionally, the achieved high accuracy in the measured FSR can also be used to measure fibre’s properties very precisely (e.g., zero chromatic dispersion wavelength) or to determine their temperature dependence. The method requires no alignment and requires only a few off-the-shelf components and instruments.
关键词： fibre characterization,temperature sensing,RF beat signal analysis,free spectral range,fibre Fabry-Perot interferometers
更新于2025-09-12 10:27:22
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Enabling Simultaneous DAS and DTS Through Space-Division Multiplexing Based on Multicore Fiber
摘要： We have proposed and demonstrated a hybrid optical-fiber sensor that enables simultaneous distributed acoustic sensing (DAS) and distributed temperature sensing (DTS). The hybrid fiber sensor is realized through space-division multiplexed (SDM) reflectometers in a multicore fiber (MCF), where Raman optical time-domain reflectometry (ROTDR) for DTS is implemented simultaneously with phase-sensitive optical time-domain reflectometry (Φ-OTDR) for DAS through space-division multiplexing. The SDM reflectometers share an identical pulse source, but use separate interrogation fiber cores, allowing simultaneous measurement of ROTDR and Φ-OTDR. The proposed hybrid sensor based on MCF does not suffer from the incompatible pump power levels issue existing in its counterpart based on single mode fiber thanks to the SDM implementation. Thus it effectively eliminates the restriction imposed by fiber nonlinear effects (e.g., modulation instability). Wavelet transform denoising method is employed to reduce the noise of temporal ROTDR traces; as a result, the worst temperature uncertainty is reduced from 4.1 to 0.5 °C over 5.76 km sensing range. The proposed SDM hybrid fiber sensor can realize simultaneous distributed intrusion detection and temperature monitoring. It offers great potential in long-term real-time pipeline monitoring for oil and gas industry.
关键词： Distributed acoustic sensing,multicore fiber,distributed temperature sensing,space-division multiplexing
更新于2025-09-11 14:15:04
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Characterisation of silicon fibre Bragg grating in near-infrared band for strain and temperature sensing
摘要： Fibre Bragg grating inscription in the crystalline silicon (Si)-core fibre is described using visible light femtosecond laser pulses. The femtosecond pulses at 517 nm propagate through the transparent silica glass cladding and are fully absorbed by the Si core generating locally high temperatures and stress fields in forming the grating periods. The Si FBGs were characterised in reflection, calibrated for a first time as strain and temperature sensors and compared with that of FBGs inscribed in standard silica fibres.
关键词： temperature sensing,femtosecond laser inscription,silicon fibre Bragg grating,near-infrared band,strain sensing
更新于2025-09-11 14:15:04
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Tunable upconversion luminescence and optical temperature sensing based on non-thermal coupled levels of Lu3NbO7:Yb3+/Ho3+ phosphors
摘要： The color-tunable upconversion (UC) emission and optical temperature sensing based on non-thermal coupled levels (NTCL) were observed from the Yb3t/Ho3t codoped Lu3NbO7 phosphors synthesized by the solid-state method. The phosphors are capable of generating color tunable UC luminescence from green (yellow) to yellow (green) with the increase of the Yb3t concentration. The tunable emission is due to the different energy back transfer processes from Ho3t to Yb3t. The temperature sensing performances are investigated in the temperature range of 293–573 K based on NTCL by using fluorescence intensity ratio technology. The maximum absolute sensitivities are 0.37%K?1, 0.94%K?1, 0.27%K?1 at 298 K, which are based on three pairs NTCL of (5F4/5S2→5I8)/(5F5→5I8), (5F5→5I8)/(5F4/5S2→5I7) and (5F4/5S2→5I8)/(5F4/5S2→5I7) of Ho3t, respectively. The above results suggest that the as-prepared Lu3NbO7:Yb3t/Ho3t phosphors have great potential for the application prospects of upconverter, color tunable device and optical temperature sensor.
关键词： Phosphor,Optical temperature sensing,Lu3NbO7,Upconversion luminescence
更新于2025-09-11 14:15:04