All-fiber laser self-mixing interferometry for signal enhancement with phase-shifted fiber Bragg grating

Xie, Zhanwu; Li, Jie; Guo, Dongmei; Xia, Wei; Yan, Haitao; Wang, Ming

doi:10.1016/j.optlastec.2023.110496

Optics & Laser Technology

2024

DOI: 10.1016/j.optlastec.2023.110496

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All-fiber laser self-mixing interferometry for signal enhancement with phase-shifted fiber Bragg grating

Zhanwu Xie,

Jie Li,

Dongmei Guo

et al.

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Cited by 2 publications

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Analysis and measurement of vibration characteristics of a hollowing defect based on a laser self-mixing interferometer

Chen 陈,

Cao 曹

et al. 2024

Chinese Phys. B

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In order to solve the problems of the existing detection methods for hollowing defects, such as inconvenient operation, low efficiency, intensive subjectivity, and to improve the efficiency of the acoustic-optic fusion detection method for hollowing defects. The vibration characteristics of the hollowing defect are measured and analyzed base on the laser self-mixing interferometer in this paper. The ceramic tile above the hollowing defect is equivalent to the thin circular plate with peripheral fixed support. According to Kirchhoff's classical circular plate theory and the circular plate displacement function based on the improved Fourier series, the theoretical model of the circular plate is established. By solving the characteristic equation, the theoretical modal parameters of the hollowing defects are obtained. Subsequently, an experimental system based on laser self-mixing interferometer is built, and modal experiments are carried out by using the hammering method. The experimental modal parameters are obtained through professional modal analysis software. Through comparative analysis between the theoretical and experimental modal parameters, the error of the natural frequency results is tiny and the mode shapes are consistent. These results provide a theoretical guidance for the practical acoustic-optic fusion non-destructive detection for hollowing defects.

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Analysis and measurement of vibration characteristics of a hollowing defect based on a laser self-mixing interferometer

Chen 陈,

Cao 曹

et al. 2024

Chinese Phys. B

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Multiple self-mixing interference with the Faraday effect for detecting magnetic fields

Huo,

Huang,

Sun

2024

Opt. Lett.

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Detection of magnetic fields is widely used in magnetic materials, electronic devices, medical imaging, and navigation systems. We conducted the experiments using a TGG crystal in different magnetic fields to observe multiple laser self-mixing interference in the frequency domain for experimentation. Every spectral line of the multiple laser self-mixing interference contained the peaks exhibiting a decay trend due to the rotation of the light’s polarized orientation according to the Faraday effect. The decay rate of the spectral line depended on the magnetic field density. To quantify the decay rate, the decay coefficient was obtained via fitting of the spectral line. The equation between the decay coefficient and the magnetic field density was established from the experimental results, and the magnetic field density was detected using the equation. This work exhibited a potential detection capability for magnetic fields.

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All-fiber laser self-mixing interferometry for signal enhancement with phase-shifted fiber Bragg grating

Cited by 2 publications

References 17 publications

Analysis and measurement of vibration characteristics of a hollowing defect based on a laser self-mixing interferometer

Analysis and measurement of vibration characteristics of a hollowing defect based on a laser self-mixing interferometer

Multiple self-mixing interference with the Faraday effect for detecting magnetic fields

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