Ms. Gengpeng Li Profile

Gengpeng Li

at Xian Univ of Posts & Telecommunications

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Author

Publications (5)

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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Proceedings Article | 24 November 2021 Paper

Study on target location of non-line-of-sight polarized ultraviolet light

Chun-yan Li, Dou Luo, Geng-peng Li, Lin Qiao, Qi Tang

Proceedings Volume 12065, 120650J (2021) https://doi.org/10.1117/12.2603714

KEYWORDS: Receivers, Scattering, Transmitters, Light scattering, Ultraviolet radiation, Polarization, Photons, Ranging, Non-line-of-sight propagation, Picosecond phenomena

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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.

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