M-OTDR sensing system based on 3D encoded microstructures

Sun, Qizhen; Ai, Fan; Liu, Deming; Cheng, Jianwei; Luo, Hongbo; Peng, Kuan; Luo, Yiyang; Yan, Zhijun; Shum, Ping

doi:10.1038/srep41137

Cited by 20 publications

(7 citation statements)

References 27 publications

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“…[27] When compared to traditional enamel repair methods, our enamel repair with amorphous ceramics is outstanding (Figure 2i). Both the Young's modulus and hardness of E-Amorphous ZrO 2 surpassed the values of enamel repaired by remineralization [15,[36][37][38][39][40][41][42][43][44][45] and with a composite resin, [46][47][48][49][50][51] which showed a similar behavior to the E-Sound samples (Figure 2i). To the best of our knowledge, the adoption of amorphous ZrO 2 in the fields of enamel repair has not been previously reported, and our enamel repair approach has been proven advantages, indicating great potential for future clinical applications.…”

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confidence: 90%

Enamel Repair with Amorphous Ceramics

et al. 2020

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Developing high‐performance materials in physiological conditions to clinically repair stiff tissue for long lifespan remains a great challenge. Here, an enamel repair strategy is reported by efficiently growing a biocompatible ZrO2 ceramic layer on defective enamel through controllable hydrolysis of Zr4+ in oral‐tolerable conditions. Detailed analysis of the grown layer indicates that the grown ZrO2 ceramic is amorphous without grain boundary and dislocation, which endows the repaired enamel with natural enamel comparable mechanical performance (modulus ≈82.5 GPa and hardness ≈5.2 GPa). Besides, the strong chemical connection between unsaturated coordinated Zr4+ in amorphous structure and PO43− greatly strengthen the crystalline–amorphous interface of the repaired enamel to endure the long‐time mastication damage. Moreover, these ZrO2 ceramics provide hydrophilic, electronegative, and smooth surfaces to resist the adhesion and proliferation of cariogenic bacteria. The hybrid amorphous–crystalline interface design with advantages in biomechanical compatibility would promote the evolution of a variety of cutting‐edge functional materials for medical and engineering application.

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confidence: 90%

Enamel Repair with Amorphous Ceramics

et al. 2020

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“…However, these intensity demodulation methods cannot restore the full scale external vibration signal information for the nonlinearity between the changed interfering amplitude and the demodulated magnitude of vibration-induced perturbation. To overcome this obstacle, so-called fiber-optic distributed acoustic sensing (DAS) has been proposed, making DAS a research hotspot in recent years [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

Feng

Huang

et al. 2018

Applied Sciences

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An improved phase-sensitive optical time-domain reflectometry (φ-OTDR) system with sub-meter spatial resolution is demonstrated. Two Michelson interferometers (MIs) with different path length differences are used in the proposed system. One is 10 m, the other is 9.2 m. Two Rayleigh backscattering phase traces with different spatial resolution are obtained by a phase generated carrier (PGC) algorithm at adjacent times. After using differencing and adaptive 2-D bilateral filtering algorithms, a 0.8-m spatial resolution over 2 km is achieved. Experimental results indicate that the system shows an extraordinary linearity as high as 99.94% with amplitude-modulation and acquires a detection frequency from 5 to 500 Hz.

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“…Distributed optical fiber sensing has been extensively investigated in the past decades due to its superior performances over other conventional electrical sensors, e.g., long sensing distance, immunity to electromagnetic interference, and high sensitivity. Various technologies, such as optical time domain reflectometry (OTDR), Brillouin OTDR (BOTDR), Raman OTDR (ROTDR), phase OTDR (Φ-OTDR), and polarization OTDR (POTDR), have been proposed to achieve the information of temperature, stress, strain, vibration, electromagnetic field and so on [1][2][3][4][5], among which vibration is of great importance for perimeter security monitoring and aircraft structural health monitoring. Because the vibration along the optical fiber would change the SOP of the light traveling in it, the POTDR can realize vibration measurement by monitoring the change of the SOP of the Rayleigh backscattered light in fiber [6].…”

Section: Introductionmentioning

confidence: 99%

Multi-vibration detection by probe pulses with ergodic SOPs in a POTDR system

Wang

et al. 2018

Opt. Express

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Polarization optical time domain reflectometers (POTDR) can detect vibration of fiber via the change of the state of polarization (SOP) of the Rayleigh backscattered light. For traditional POTDR systems, one key problem is the high misdiagnosis rate when multiple vibrations are simultaneously applied on the sensing fiber due to the random birefringence along the fiber. To solve this problem, we propose in this paper a novel implementation of the POTDR using probe pulses with ergodic SOPs. A series of vibration spectra along the fiber are obtained by sweeping the SOP of the probe pulse. The sum of these vibration spectra, which should be immune to the birefringence of the sensing fiber, is used to analyze the vibration information. Numerical simulation and experiments are carried out to analyze the performance of the proposed system when the input SOPs are traversed with uniform distribution and random distribution. Results show that the misdiagnosis rate of detecting multi-vibration with different frequencies is greatly reduced. In addition, detection of more-than-two vibrations with the same frequency based on POTDR is successfully performed for the first time to the best of our knowledge.

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M-OTDR sensing system based on 3D encoded microstructures

Cited by 20 publications

References 27 publications

Enamel Repair with Amorphous Ceramics

Enamel Repair with Amorphous Ceramics

Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

Multi-vibration detection by probe pulses with ergodic SOPs in a POTDR system

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