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23 results on '"Han, Gaoce"'

4. High-resolution 𝜙-OFDR using phase unwrap and nonlinearity suppression

Author

Guo, Zhen, Yan, Jize, Han, Gaoce, Yu, Yifei, Greenwood, David, and Marco, James

Abstract

Phase-sensitive optical frequency domain reflectometer (𝜙-OFDR) is investigated to deliver an accurate distributed measurement with high spatial resolution. It is found that random phase noise and quadrant discrimination during phase calculation are the main reasons for the random hopping in 𝜙-OFDR. By efficiently eliminating random hopping in the phase unwrap and suppressing the laser-induced nonlinear sweep for the theoretical spatial resolution, the proposed 𝜙-OFDR is proved to be able to decouple the limitation between resolution and accuracy in coherent OFDR (C-OFDR). Distributed strain measurement with 20 mm spatial resolution in 𝜙-OFDR is obtained and analysed. Measurement with little deviation and uniform sensitivity between applied strain and phase change both validate the efficient noise suppression for extreme resolution measurement. Then the influence of the initial sweep frequency between two times measurements is studied. With a further reduced 800 µm spatial resolution, the proposed 𝜙-OFDR is able to retain accurate distributed measurement compared to conventional C-OFDR methods. Besides, the computation time of the 𝜙-OFDR is only 3.2% of the C-OFDR.

Published
2023

18. Output Properties of Self-Heated Alkali Laser with Mini Vapor Cell

Author

韩高策 Han Gaoce, 谭荣清 Tan Rongqing, 李辉 Li Hui, 黄伟 Huang Wei, and 李志永 Li Zhiyong

Subjects
Vapor cell, Materials science, law, Analytical chemistry, Electrical and Electronic Engineering, Laser, Alkali metal, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention
Published
2017
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19. Investigation on the thermal properties of volume Bragg grating in photo-thermo-refractive glass

Author

韩高策 Han Gaoce, 李. 辉. Li Hui, 黄. 伟. Huang Wei, 谭荣清 Tan Rongqing, 柯常军 Ke changjun, 叶. 庆. Ye Qing, and 李志永 Li Zhiyong

Subjects
PHOSFOS, Ultrasonic grating, Optics, Materials science, Fiber Bragg grating, Space and Planetary Science, business.industry, Thermal, Aerospace Engineering, Volume bragg grating, Electrical and Electronic Engineering, business, Atomic and Molecular Physics, and Optics
Published
2017
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20. Methane Pressure Detection Based on Fourier Transform Infrared Spectroscopy

Author

李. 辉. Li Hui, 韩高策 Han Gaoce, 谭荣清 Tan Rongqing, 叶. 庆. Ye Qing, 李志永 Li Zhiyong, and 黄. 伟. Huang Wei

Subjects
Materials science, Methane pressure, Analytical chemistry, Electrical and Electronic Engineering, Fourier transform infrared spectroscopy, Atomic and Molecular Physics, and Optics, Fourier transform spectroscopy, Electronic, Optical and Magnetic Materials
Published
2017
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