Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

Cao, Ye; Pei, Yanxi; Tong, Zhengrong

doi:10.7498/aps.63.024206

Cited by 6 publications

(1 citation statement)

References 13 publications

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“…Microfiber has attracted significant attention due to a large evanescent field outside the fiber, which allows strong evanescent-wave coupling between microfibers and their environment [7,8] and can induce high tunability of the optical property of the fiber and high sensitivity in optical fiber sensing field. [9][10][11] However, the optical performances of the conventional microfiber long period grating and microhole fiber long period grating degrade quickly due to light scattering from dust particles and cracks induced by water vapor, and an increasing unrecoverable optical loss is observed over time if they are left in open air. [12,13] Moreover, the microfibers are fragile and not easy to handle, which hinders practical applications of these fibers.…”

Section: Introductionmentioning

confidence: 99%

Wavelength and sensitivity tunable long period gratings fabricated in fluid-cladding microfibers

Jin¹,

zhang²,

Zhang³

et al. 2022

Chinese Phys. B

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We report the fabrication of long period gratings in fluid-cladding microfibers by directly focusing a femtosecond laser beam on the microfibers surface to induce periodical modification a long one side of the microfibers. A long period grating is fabricated in a water-cladding microfiber with a diameter of ~ 5 μm, which demonstrates a resonant attenuation of 28.53 dB at wavelength of 1588.1 nm with 10 pitches. When water cladding is changed to be refractive index oil of n= 1.33 and alcohol solution with concentration of 5%, the resonance wavelength shifts to 1575.1 nm with resonant attenuation of 24.91 dB and 1594.1 nm with resonant attenuation of 35.9 dB, respectively. The long period grating demonstrates different temperature sensitivities of–0.524 nm/°C,–0.767 nm/°C and–1.316 nm/°C for water, alcohol solution and refractive index oil cladding microfibers, respectively, which means the alterable liquid cladding allows the availability of tunable wavelength and sensitivity. The fluid-cladding protects the microfibers from external disturbance and contamination and allows more flexibility in controlling the transmission property and sensing characteristics of long period gratings, which can be used as fiber devices and sensors for chemical, biological, and environmental applications.

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Section: Introductionmentioning

confidence: 99%

Wavelength and sensitivity tunable long period gratings fabricated in fluid-cladding microfibers

Jin¹,

zhang²,

Zhang³

et al. 2022

Chinese Phys. B

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Simultaneous measurement of the surrounding refractive index and temperature using a local-micro-structured long-period fiber grating sensor operating near the phase-matching turning point

Wang,

Li,

Pang

et al. 2024

J. Opt. Soc. Am. B

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We have proposed a local-micro-structured long-period fiber grating (LMSLPFG) sensor near the phase-matching turning point (PMTP) for simultaneous measurement of the surrounding refractive index (SRI) and temperature. By using the HF solution or a femtosecond laser to partially change the cladding radius of LPFG, the LMSLPFG is realized. Such change affects the effective refractive index of cladding mode and further causes a new resonant peak in the spectrum. By using the transfer matrix method, the formation mechanisms of the peak in the middle of the LMSLPFG transmission spectrum corresponding to a little off-resonant state (ALOR) near PMTP and the other two peaks on both sides corresponding to the dual-peak resonance are studied. On this basis, the sensing characteristics of such three resonant peaks to SRI and temperature are analyzed. When the SRI and temperature change, the transmissivity of the peak in ALOR changes without a response occurring at resonant wavelength, while the wavelength of the other two dual peaks will respond proportionately. The numerical simulation results demonstrate that the sensitivities of the distance between the dual peaks to SRI and temperature are 777.14 nm/RIU and −0.22nm/∘C, respectively, and the sensitivities of single peak transmissivity to SRI and temperature are −394.06dB/RIU and 0.05 dB/°C, respectively. Therefore, the sensitivity matrix can be used to measure SRI and temperature simultaneously with a single LMSLPFG.

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Simultaneous Vector Bend and Temperature Sensing Based on a Polymer and Silica Optical Fibre Grating Pair

Yan

Liu

et al. 2018

Sensors

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The bending response of polymer optical fibre Bragg grating (POFBG) and silica optical fibre Bragg grating (SOFBG) mounted on a brass beam have been systematically studied and compared. The results indicate that POFBG has higher (almost twice as much) bend sensitivity than SOFBG. Based on the difference between the bend and temperature sensitivity of POFBG and SOFBG, a new method of measuring vector bend and temperature simultaneously was proposed by using a hybrid sensor head with series connection of one POFBG and one SOFBG with different Bragg wavelengths. It provides high sensitivity and resolution for sensing bend and temperature changes simultaneously and independently. The proposed sensor can find some applications in the fields where high sensitivity for both bend and temperature measurements are required.

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Simultaneous measurement of temperature and bending-curvature using a single local micro-structured longperiod fiber grating

Cited by 6 publications

References 13 publications

Wavelength and sensitivity tunable long period gratings fabricated in fluid-cladding microfibers

Wavelength and sensitivity tunable long period gratings fabricated in fluid-cladding microfibers

Simultaneous measurement of the surrounding refractive index and temperature using a local-micro-structured long-period fiber grating sensor operating near the phase-matching turning point

Simultaneous Vector Bend and Temperature Sensing Based on a Polymer and Silica Optical Fibre Grating Pair

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