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Multi-parameter sensor based on single Long Period Grating in Panda fiber for the simultaneous measurement of SRI, temperature and strain
摘要： In this work, a three-parameter sensor for the simultaneous measurement of surrounding refractive index (SRI), temperature and strain is presented. It is based on a single Long Period Grating (LPG) written in a polarization-maintaining Panda fiber, by means of a simple technique based on Electric Arc Discharge. For the purpose, it is performed the monitoring of the wavelength shift of three different resonances, each one associated to a different cladding mode. Moreover, the set of resonances is acquired for two polarizations of the input light, i.e. aligned to the slow and fast axis of the fiber. The three-parameter sensing is promoted by the fact that the resonance dips show different sensitivities to SRI, temperature and strain, which change their magnitudes and signs when the polarization is switched. It was demonstrated that the sensor can be applied to simultaneously measure SRI in range 1.33–1.40, temperatures comprised in 20–60 °C, and strain of hundreds of με. This device could find application in the fields of materials science and structural health monitoring.
关键词： Refractive index sensor,Temperature sensor,Fiber grating sensor,Strain sensor,Multi-parametric sensor,Long period grating
更新于2025-11-28 14:24:03
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Yb/Er/Tm tri-doped Na3ZrF7 upconversion nanocrystals for high performance temperature sensing
摘要： Non-contact optical thermometry based on fluorescence intensity ratio (FIR) technique has been widely researched over the past few decades. However, the reported systems exhibit two important shortcomings including the existence of a few interferential signals in addition to the required spectral bands for FIR and the absence of internal standard for reference signal. Herein, only two emission bands of Er3+: 4F9/2→4I15/2 (~673 nm) and Tm3+: 3H4 → 3H6 (~800 nm) are achieved in Yb/Er/Tm tri-doped Na3ZrF7 nano-system. Moreover, the upconversion (UC) emission intensity of Er3+ keeps unchanged with the rising of temperature, which is applied as reference signal; while that of Tm3+ enhances evidently, which is applied as temperature signal. The calculated maximum absolute temperature sensitivity (Sa) and relative temperature sensitivity (Sr) are 0.17 K-1 at 393 K and 1.76 %K-1 at 313 K, respectively.
关键词： Na3ZrF7 nanocrystals,self-reference,rare earth ions,temperature sensor,upconversion
更新于2025-11-14 17:04:02
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Modulated up-conversion luminescence and low-temperature sensing of Gd3Ga5O12:Yb3+/Er3+ by incorporation of Fe3+ ions
摘要： Yb3+/Er3+ co-doped crystals show strong up-conversion luminescence and their temperature dependence of luminescence intensity enable the application of temperature sensors. Such sensors usually work at hundreds Kelvin with high sensitivity, while the sensors appropriate to very low temperatures are rarely reported. In this study, we report the low temperature sensing of Gd3Ga5O12:Yb3+/Er3+ nanocrystals by partial or total substitution of Ga3+ by Fe3+ ions. The up-conversion photoluminescence of the nanocrystals is measured on cooling from 300 to 4.2 K. The low-temperature sensing performance is improved, and the structure, magnetic and optical properties are modulated by the substitution of Fe3+ ions, rendering the nanocrystal useful for multi-functional sensing application.
关键词： Temperature sensor,Magnetic doping,Photoluminescence,Up-conversion
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Saint Petersburg, Russia (2018.10.22-2018.10.23)] 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Study of Oxyfluoride Glasses with Silver Molecular Clusters for Application in Sensoric and Optoelectronics
摘要： Temperature sensitivity of Oxyfluoride glasses with molecular silver clusters and samarium ions were studied. The experimental procedure for obtaining luminescence spectra at various temperatures is described. The perspective of using oxyfluoride glasses in fiber-optic temperature sensors is considered.
关键词： sensitive element,luminescence,Fiber-optical temperature sensor,oxyfluoride glass,spectrum,molecular clusters of silver
更新于2025-09-23 15:23:52
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Theoretical analysis of seawater depth and temperature measurement with C-type micro-structured fiber grating
摘要： A new C-type micro-structured grating structure was proposed for simultaneous measurement of depth and temperature in seawater. Because wedge-shaped defects got introduce, high birefringence was excited at fiber core of grating. Thermo sensitive materials filled in micro pores to improve the sensitivity of temperature. Then we established a mathematical model of birefringence effect in C-type structure. This work analyzed stress distribution in all directions under two disturbances. In pressure and temperature environment, reflection peaks in two-polarization states separated with a large offset. Two characteristic parameters:λB, y ? λB, x, λB, y + λB, x were proposed for corresponding measurement. Structural parameters got optimize for better performance. Calculated output signals had high sensitivity and linearity under pressure range of 0–10 MPa and temperature range of 0–40 °C. λB, y ? λB, x mainly responded to pressure, which got sensitivity ?1.709 nm/MPa. While temperature mainly influenced λB, y + λB, x and the obtained temperature sensitivity was 1.054 nm/°C. This structure would have a great potential application due to the mature demodulation technique of grating signal.
关键词： Seawater measurement,Depth measurement,Temperature sensor,C-type micro-structured grating,Optical fiber sensor
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Singapore, Singapore (2018.4.22-2018.4.26)] 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Temperature Sensor Based on Multimode Fiber Bragg Grating
摘要： A multi-layer film fiber Bragg grating (FBG) is used for high temperature measurement. In order to realize the temperature measurement in a wide dynamic range, a multi-layer film fiber Bragg grating (MFBG) is fabricated. Due to its multi-layer structure, the MFBG has been widely studied extensively for temperature measurement. Most of its operation principle is based on the variation analysis of the spectrum caused by temperature change. For measuring temperature, fiber Bragg grating (FBG) temperature sensor has been widely used due to its advantages of good insulation, light weight, low cost, compact structure, chemical property and ability to sense in harsh environment. However, the FBG has been widely studied extensively for temperature measurement. Most of its operation principle is based on the variation analysis of the spectrum caused by temperature change. For measuring temperature, fiber Bragg grating (FBG) temperature sensor has been widely used due to its advantages of good insulation, light weight, low cost, compact structure, chemical property and ability to sense in harsh environment. However, the FBG is difficult to couple with other optical devices, the MFBG has been used to measure the ambient temperature. In order to realize the temperature measurement in a wide dynamic range, a multi-layer film fiber Bragg grating (MFBG) is fabricated. Due to its multi-layer structure, the MFBG has been widely studied extensively for temperature measurement. The working principle is discussed and different reflection peaks are separated from the transmission spectrum. The experimental results show that the temperature response at different peaks is similar, and the optical fiber sensor has a great potential for temperature measurement.
关键词： fiber Bragg grating,multi-layer film,optical fiber sensor,temperature sensor
更新于2025-09-23 15:22:29
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Cascaded Two-core PCFs based In-line Fiber Interferometer for Simultaneous Measurement of Strain and Temperature
摘要： A new fiber sensor configuration based on the cascaded in-line fiber interferometers has been proposed and experimentally demonstrated for simultaneous measurement of strain and temperature. In order to make the cascaded in-line interferometers, we used two different types of two-core photonic crystal fibers (TCPCFs) having two cores in the symmetry and asymmetry structures. The TCPCFs have different transmission characteristics owing to the distinct geometric structures of the integrated cores, this causes the different strain and temperature sensitivities and thus the two parameters can be discriminated. The measurement resolutions are achieved to be 11.1 με and 1.10 oC for strain and temperature, respectively, in the 10 pm wavelength resolution.
关键词： Mach-Zehnder interferometer,Two-core photonic crystal fiber,strain and temperature sensor
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 3rd Optoelectronics Global Conference (OGC) - Shenzhen (2018.9.4-2018.9.7)] 2018 IEEE 3rd Optoelectronics Global Conference (OGC) - Rapid Response of High Precision Fiber Bragg Grating Based Temperature Sensor
摘要： A new walk-in high precision fiber Bragg grating temperature sensor encapsulated with ultra-fine stainless steel tube was designed. The temperature resolution of the fiber sensor is 0.01 ℃ and the Bragg wavelength of the grating responses linearly with the temperature in the range of room temperature to 175 ℃, meanwhile, the response time is less than 108 ms, which can satisfy the rapid response need of oil temperature profile. In addition, the resistance of the temperature sensor to pressure can be high up to 100 MPa.
关键词： fiber bragg grating,rapid response,temperature sensor
更新于2025-09-23 15:22:29
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A Tunable Optimized Low-Temperature Sensor Based on the Hybrid Photonic Crystals (F4/Bg5/F4) and (Bg5/F4/Bg5)
摘要： In this paper, we present a novel type of low-temperature sensor based precisely on the symmetrical hybrid photonic crystals. Thanks to the two-fluid model and the transfer matrix method, we study the temperature sensitivity of the hybrid multilayers (F4/Bg5/F4) and (Bg5/F4/Bg5) where F4 represents the fourth iteration of the quasi-periodic Fibonacci sequence and Bg5 designates the multilayer Bragg mirror (HLS)5. We assume that the layers H, L, and S indicate precisely the dielectric materials of Bi4Ge3O12, SiO2, and YaBO2CuO7 superconductor one. The analysis of the transmittance spectra shows that the hybrid photonic crystal is more sensitive to the temperature than the periodic one. A higher sensibility value is reached due to the possible combination of the periodic and quasi-periodic sequences. Our investigation reveals that the photonic crystal (F4/Bg5/F4) is more sensitive to low temperature compared to (Bg5/F4/Bg5). The sensitivity is significantly affected by the position of quasi-periodic sequences. The sensitivity of such photonic crystals can be adequately controlled by applying a symmetrical chirping. The designed structures pave the way toward the achievement of a potential low-temperature sensor.
关键词： Low-temperature sensor,Tunable,Fibonacci,Photonic crystals,Chirped,TMM,Optimization
更新于2025-09-23 15:22:29
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Highly sensitive temperature sensor based on Sagnac interferometer with liquid crystal photonic crystal fibers
摘要： We propose and investigate a temperature sensor based on Sagnac interferometer with liquid crystal (LC) photonic crystal fiber (PCF) by finite element method (FEM). LC E7 which is anisotropic under electrical field is designed to be infiltrated into the cladding air holes of PCF. The birefringent PCF is then launched into a Sagnac interferometer. The interference spectrum of the Sagnac interferometer is influenced by the thermal effect of LC E7 and thus could be used to measure the temperature. The simulation results show that the temperature measuring sensitivity and resolution reach to 15 nm/K and 6.7E?4 K in the range of 290–320 K. The measuring range and sensitivity could be modified further by optimizing the PCF structure parameters.
关键词： Temperature sensor,Liquid crystal,Sagnac interferometer,Photonic crystal fiber
更新于2025-09-23 15:22:29