Dr. Jihong Liu Profile

Dr. Jihong Liu

Professor at Xi'an Univ. of Posts & Telecommunications

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Author

Publications (13)

SPIE Journal Paper | 9 March 2024

High linear sensitivity humidity and temperature sensing based on chiral long-period fiber grating

Kaili Ren, Jiayue Hu, Aochi Jia, Jiawei Xi, Yuchong Ren, Xuewen Yan, Jinze Li, Jun Dong, Jihong Liu

OE, Vol. 63, Issue 03, 036103, (March 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.3.036103

KEYWORDS: Humidity, Sensors, Polyvinyl alcohol, Graphene, Nanofibers, Temperature metrology, Optical gratings, Fiber optics sensors, Quantum sensors, Fabrication

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Proceedings Article | 27 November 2023 Paper

High sensitivity temperature and humidity sensing based on physically deformed long-period fiber grating

Jiayue Hu, Aochi Jia, Menghao Li, Jihong Liu, Kaili Ren

Proceedings Volume 12771, 127710M (2023) https://doi.org/10.1117/12.2689246

KEYWORDS: Humidity, Polyvinyl alcohol, Optical gratings, Graphene, Temperature sensors

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Proceedings Article | 27 November 2023 Paper

High-speed spectral confocal signal collection method based on acquisition and tracking algorithm with variable window-width

Yongchao Wang, Kaili Ren, Lei Liang, Baomeng Hao, Jihong Liu

Proceedings Volume 12769, 1276905 (2023) https://doi.org/10.1117/12.2687648

KEYWORDS: Windows, Reflection, Confocal microscopy, Detection and tracking algorithms, CMOS sensors, Photodetectors, Signal processing, Signal detection, Sensors, Light sources

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Proceedings Article | 20 January 2023 Paper

Design of dispersive objective lens for spectral confocal displacement sensor based on GRIN lens

Chunyan Li, Ke Li, JiHong Liu, Zheng Lv, Gengpeng Li, Dou Luo

Proceedings Volume 12558, 125580A (2023) https://doi.org/10.1117/12.2651399

KEYWORDS: GRIN lenses, Confocal microscopy, Objectives, Sensors, Refractive index, Lens design, Zemax, Precision measurement, Light, Gradient-index optics

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Proceedings Article | 20 January 2023 Paper

Research on spectral confocal displacement measurement method based on machine learning

Chunyan Li, Zheng Lv, Jihong Liu, Ke Li, Gengpeng Li, Dou Luo

Proceedings Volume 12563, 1256309 (2023) https://doi.org/10.1117/12.2652096

KEYWORDS: Neural networks, Machine learning, Signal processing, Sensors, Networks, Light sources, Light, Calibration, Genetic algorithms

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Proceedings Article | 24 November 2021 Paper

Thickness measurement of radial GRIN lens based on chromatic confocal technology

Chunyan Li, Gengpeng Li, Jihong Liu, Dou Luo, Jiayi Liu

Proceedings Volume 12064, 120640B (2021) https://doi.org/10.1117/12.2605937

KEYWORDS: GRIN lenses, Refractive index, Confocal microscopy, Colorimetry, Objectives, Spectroscopy, Refraction, Precision measurement, Optical components, MATLAB

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SPIE Journal Paper | 16 September 2021

Influence of eccentricity and tilt of radial GRIN lens on its thickness measurement by chromatic confocal technology

Chunyan Li, Gengpeng Li, Jihong Liu, Dou Luo, Jiayi Liu

OE, Vol. 60, Issue 09, 094107, (September 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.9.094107

KEYWORDS: GRIN lenses, Refractive index, Colorimetry, Confocal microscopy, Objectives, Light, Geometrical optics, Optical engineering, Lithium, Error analysis

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The chromatic confocal technology (CCT) has ultra-high distance measurement resolution and the characteristics of multi-surface tomography. Based on the principle of optical dispersion and confocal, the technology achieves accurate axial position or micro-displacement measurement. The radial gradient index (GRIN) lens is a typical important inhomogeneous material. Its refractive index gradually decreases from the center to the edge along the radial direction. We propose to measure the thickness of the radial GRIN lens based on CCT. The thickness measurement model is established by the ray-tracing method, the optical Lagrange function, and the ray arc differential in the Cartesian coordinate system. The refractive index distribution makes the eccentric tilt of the lens change the propagation of the probe light and affects the extraction of the peak of the spectral response causing the thickness measurement error. The influence of eccentricity and tilt of the radial GRIN lens on its thickness measurement is studied. The precision shift table drives the radial GRIN lens movement to simulate the eccentric tilt state of the lens under the dispersion probe. According to the comparative analysis between the experimental and simulation results, it is concluded that the greater the eccentric distance and inclination degree of the radial GRIN lens is, the greater the influence on the thickness measurement is. The larger the lens thickness is, the greater the measurement error is. For the radial GRIN lens with a thickness of 2.36 mm, the measurement error is about 20 μm when the eccentricity is 0.1 mm and the tilt is 6 deg. The research results have significance for optimizing the system structure and further improving the system performance for the application of the CCT in measuring non-homogeneous materials or optical thin film. And the research will encourage the development of GRIN lens instrument preparation and application technology by improving the thickness measurement accuracy and precision of the GRIN lens.

Proceedings Article | 18 December 2019 Paper

A novel demodulation algorithm for CMOS camera-based VLC using adjacent pixel threshold

Jihong Liu, Xiaoyu Zheng, Jia Zhang, Yongchao Wang

Proceedings Volume 11340, 113400V (2019) https://doi.org/10.1117/12.2544833

KEYWORDS: Demodulation, Cameras, CMOS cameras, Image resolution, Imaging systems, Light emitting diodes, Camera shutters, Logic, Forward error correction, Telecommunications

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Proceedings Article | 18 December 2019 Paper

The study of large-broadband OAM mode converter based on helical long period fiber grating

Min-hui Cheng, Ji-hong Liu, Liu-qian Zhu, Li Yang, Dong-dong Han, Jun Dong, Kai-li Ren

Proceedings Volume 11340, 113400J (2019) https://doi.org/10.1117/12.2542307

KEYWORDS: Cladding, Phase matching, Telecommunications, Structured optical fibers, Modulation, Optical vortices, Optical design, Electronics engineering, Spiral phase plates

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Proceedings Article | 25 January 2012 Paper

Terabit optical access networks using ultra-dense WDM and coherent technology

Ming Zhu, Jihong Liu, Yu-Ting Hsueh, Gee-Kung Chang, Gordon Gu, Fujin Zhu

Proceedings Volume 8331, 83310G (2012) https://doi.org/10.1117/12.916874

KEYWORDS: Receivers, Optical networks, Networks, Wavelength division multiplexing, Phase shift keying, Digital signal processing, Transmitters, Data modeling, Single mode fibers, Channel projecting optics

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Proceedings Article | 14 December 2011 Paper

Enhancement of the laser phase noise tolerance for star 16-QAM optical coherent systems

Jihong Liu, Gee-Kung Chang

Proceedings Volume 8309, 83092J (2011) https://doi.org/10.1117/12.904242

KEYWORDS: Stars, Tolerancing, Signal to noise ratio, Phase shift keying, Optical simulations, Telecommunications, Amplitude modulation, Modulation, Optical communications, Laser applications

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Proceedings Article | 24 February 2010 Paper

Ultracompact wave plates by air holes periodic dielectric waveguides

Wenfu Zhang, Jihong Liu, Wei-Ping Huang, Wei Zhao

Proceedings Volume 7609, 76091H (2010) https://doi.org/10.1117/12.845956

KEYWORDS: Waveguides, Dielectrics, Birefringence, Photonic integrated circuits, Dielectric polarization, Wave plates, Finite-difference time-domain method, Photonics, Radio propagation, Telecommunications

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Proceedings Article | 5 December 2005 Paper

Amplified spontaneous emissions in the double-clad Er:Yt co-doped fiber

Guijin Xia, Qiang Fang, Jumei Zhang, Meng Liang, Jihong Liu

Proceedings Volume 6019, 601945 (2005) https://doi.org/10.1117/12.633456

KEYWORDS: Erbium, Ytterbium, Cladding, Optical fibers, Fiber lasers, Laser optics, Absorption, Mathematical modeling, Chromium, Optics manufacturing

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Showing 5 of 13 publications

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