Ms. Yunxin Hu Profile

Yunxin Hu

at Heilongjiang Univ

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Publications (3)

Proceedings Article | 17 August 2023 Paper

Fiber optic in-situ sensor for accurate monitoring the discharge quantity of lead-acid batteries

Yunxin Hu, Zifan Huang, Siyu Qian, Shengchun Liu

Proceedings Volume 12757, 1275733 (2023) https://doi.org/10.1117/12.2690783

KEYWORDS: Batteries, Electrolytes, Cladding, Fiber optics sensors, Refractive index, Optical sensing, Sensors, Reflection, Optical gratings, Optical fibers

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Proceedings Article | 23 October 2018 Paper

Multi-parameter sensing system based on a polarimetric fiber ring laser sensor and beat frequency demodulation

Xiujuan Yu, Xuefeng Chen, Yunxin Hu, Jintao Zhang, Shengchun Liu

Proceedings Volume 10821, 1082110 (2018) https://doi.org/10.1117/12.2502003

KEYWORDS: Fiber lasers, Birefringence, Polarization, Sensors, Fiber optics sensors, Temperature metrology, Sensing systems, Demodulation, Fiber Bragg gratings

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Proceedings Article | 10 January 2018 Paper

A 16-channel multi-longitudinal mode fiber laser sensor array system based on wavelength/frequency division multiplexing

Yunxin Hu, Zhiyong Han, Xiujuan Yu, Xuefeng Chen, Jintao Zhang, Shengchun Liu

Proceedings Volume 10618, 106180T (2018) https://doi.org/10.1117/12.2295288

KEYWORDS: Sensors, Fiber lasers, Multiplexing, Fiber Bragg gratings, Wavelength division multiplexing, Demodulation, Temperature metrology, Signal detection, Dense wavelength division multiplexing, Laser systems engineering

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The 16-channel multi-longitudinal mode fiber laser sensor array is investigated experimentally by the wavelength/frequency division multiplexing technique. In the proposed sensing system, a 4×4 sensor array is established by a few different coupling-ratio couplers, and four different fiber Bragg gratings (FBG) with different center wavelengths are used as four different sensing units. In each sensor unit, four parallel fiber laser sensors have the same operating wavelengths FBGs, but their effective laser cavity lengths slightly different from each other. Every cavity is formed by a fiber Bragg grating (FBG) serving as one reflection mirror, a piece of erbium-doped fiber (EDF) acting as the gain medium, and a Faraday rotator mirror (FRM) serving as other reflection mirror. When the pump power is higher than threshold value, the 16-channel fiber laser sensor array is stimulated stably. The frequency of the beat signal of the fiber laser sensor with different cavity lengths is used to realize frequency division multiplexing, and the wavelength division multiplexing is realized according to the operation wavelength of the fiber laser. The beat frequency signals are generated on a photodetector(PD), and monitored by a frequency spectrum analyzer(FSA). By tracking the shift of the beat frequency, all of the 16 laser sensors can be demodulated and real-time discriminated. The result of the experiment shows that different channels can be demodulated independently. The applications of the sensor array for strain and temperature measurements are also investigated. The strain or temperature information can be extracted from the change of the beat frequency signals according to the wavelength-frequency division multiplexing and the beat signal demodulation. The proposed hybrid multiplexing system can greatly reduce the weight, volume, and cost of the fiber laser sensors system while increasing the amount of the sensors multiplexable, which making it very competitive in some applications fields requiring large scale arrays such as space vehicles, marine infrastructure systems and constructional engineering.

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