Inverse finite element method and support vector regression for automated crack detection with OFDR-Distributed fiber optic sensors

Zhao, Lizhi; You, Runzhou; Ren, Liang

doi:10.1016/j.measurement.2024.114916

Measurement

2024

DOI: 10.1016/j.measurement.2024.114916

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Inverse finite element method and support vector regression for automated crack detection with OFDR-Distributed fiber optic sensors

Lizhi Zhao,

Runzhou You,

Liang Ren

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2024

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Cited by 2 publications

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Quantum weak measurement enhanced distributed acoustic sensing

Deng,

Li,

Song

et al. 2024

Opt. Lett.

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An enhanced distributed acoustic sensing (DAS) is proposed based on an extended Mach–Zehnder interferometer utilizing quantum weak measurement. The acoustic signals are encoded as the relative phase of the polarized light in several channels by fibers between optical fiber Bragg gratings (FBGs). With appropriate preselection and postselection, the acoustic signal can be extracted by performing the Fourier transform on the contrast ratio of the detected light intensity. Theoretical analysis shows that the scheme can achieve a spatial resolution of 1 m, and the system noise can be decreased by three orders of magnitude compared to classical distributed acoustic sensing. Moreover, this scheme might have potential application in long-distance acoustic source localization.

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Quantum weak measurement enhanced distributed acoustic sensing

Deng,

Li,

Song

et al. 2024

Opt. Lett.

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A Crack Detection Method for an Insulator Based on the Optical Frequency Domain Reflectometry Fiber Sensing System

Zhao,

Wen,

et al. 2024

Photonics

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In this paper, a method for detection of crack locations and the width of basin insulators is proposed. Based on the optical frequency domain reflectometry (OFDR) system, the system utilizes an FBG with high feedback for strain as well as temperature, which is affixed to the surface of the tub insulator, and a common single-mode optical fiber, which is used for transmitting data and connected to the optical backscattering reflectometry interrogator. The interrogator measures the backscattered light from the FBG, which varies with temperature or strain. The method has been used to measure the location and width of several different cracks and can locate the crack position with a spatial resolution of 1 mm and measure the crack width with a resolution of 0.77 mm. The method has been used to measure the position and width of insulators. This method provides a simple and fast approach to crack detection in insulators.

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Inverse finite element method and support vector regression for automated crack detection with OFDR-Distributed fiber optic sensors

Cited by 2 publications

References 36 publications

Quantum weak measurement enhanced distributed acoustic sensing

Quantum weak measurement enhanced distributed acoustic sensing

A Crack Detection Method for an Insulator Based on the Optical Frequency Domain Reflectometry Fiber Sensing System

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