Prof. Kun Liu Profile

Prof. Kun Liu

at Tianjin Univ

SPIE Involvement:

Author

Publications (68)

Proceedings Article | 20 November 2024 Paper

Time delay estimation accuracy enhancement with envelope filtering in LFM-DAS

Enbang Zhao, Junfeng Jiang, Shuang Wang, Kun Liu, Tianhua Xu, Tiegen Liu

Proceedings Volume 13243, 132430I (2024) https://doi.org/10.1117/12.3036626

KEYWORDS: Pulse signals, Demodulation, Correlation coefficients, Modulators, Vibration, Signal processing, Laser frequency, Frequency modulation

Read Abstract +

Proceedings Article | 27 November 2023 Paper

Fast-recovering phi-OTDR system based on multi-sideband pulse modulation

Yixuan Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Zhenyang Ding, Tianhua Xu, Tiegen Liu

Proceedings Volume 12771, 127710G (2023) https://doi.org/10.1117/12.2686669

KEYWORDS: Modulation, Pulse signals, Signal detection, Demodulation, Sampling rates, Acoustics, Vibration, Optical filters

Read Abstract +

Proceedings Article | 27 November 2023 Paper

High-sensitivity refractive-index-distributed optical fiber sensor based on optical frequency domain reflectometry

Peidong Hua, Zhenyang Ding, Kun Liu, Haohan Guo, Teng Zhang, Sheng Li, Ji Liu, Junfeng Jiang, Tiegen Liu

Proceedings Volume 12771, 127710F (2023) https://doi.org/10.1117/12.2685882

KEYWORDS: Fiber optics sensors, Sensors, Refractive index, Biosensors, Reflectometry, Single mode fibers, Rayleigh scattering, Optical fibers, Fiber optics, Biosensing

Read Abstract +

Proceedings Article | 28 September 2023 Paper

Retrieval of carbon dioxide concentrations using Tm-doped laser with deep learning algorithm

Hui Yin, Kun Liu

Proceedings Volume 12813, 128130G (2023) https://doi.org/10.1117/12.2692273

KEYWORDS: Detection and tracking algorithms, Deep learning, Carbon dioxide lasers, Carbon dioxide, Education and training, Absorption spectrum, Absorption, Signal processing, Feature extraction, Data modeling

Read Abstract +

Proceedings Article | 28 September 2023 Paper

Ultra-long-range modulated asymmetric vibration sensor based on high-frequency carrier

Xinxin Hu, Kun Liu, Yuelang Huang, Junfeng Jiang, Zhenyang Ding, Tiegen Liu

Proceedings Volume 12813, 128130A (2023) https://doi.org/10.1117/12.2691732

KEYWORDS: Modulation, Vibration, Optical amplifiers, Sensors, Sensing systems, Phase modulation, Mach-Zehnder interferometers, Data acquisition, Fiber lasers, Erbium lasers

Read Abstract +

Proceedings Article | 28 September 2023 Paper

Simultaneous low- and high-wavenumber optical fiber CARS probe using vector adjustment and pulse-to-pulse alignment

Tong Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Panpan Niu, Liu Yize, Tianhua Xu, Tiegen Liu

Proceedings Volume 12813, 1281308 (2023) https://doi.org/10.1117/12.2691713

KEYWORDS: Pulse signals, Optical fibers, Signal detection, Raman spectroscopy, Vibration, Ultrafast phenomena, Optical filters, Dichroic mirrors, Bioalcohols, Tunable filters

Read Abstract +

Proceedings Article | 28 September 2023 Paper

A high-speed demodulation scheme for phi-OTDR system based on dual-sideband modulation

Yixuan Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Zhenyang Ding, Tianhua Xu, Tiegen Liu

Proceedings Volume 12813, 1281307 (2023) https://doi.org/10.1117/12.2691710

KEYWORDS: Signal detection, Modulation, Demodulation, Pulse signals, Vibration, Optical sensing, Optical fibers, Electronic filtering, Computer hardware

Read Abstract +

Proceedings Article | 19 December 2022 Poster + Paper

Label-free protein quantitation using liquid crystal-enhanced optofluidic biosensor

Ziyihui Wang, Tianhua Xu, Haonan Wang, Yize Liu, Kun Liu, Junfeng Jiang, Yu-Cheng Chen, Tiegen Liu

Proceedings Volume 12321, 123210Q (2022) https://doi.org/10.1117/12.2638371

KEYWORDS: Proteins, Liquid crystals, Molecules, Optofluidics, Biosensors, Microresonators, Biosensing, Resonators, Optical microcavities, Refractive index

Read Abstract +

Proceedings Article | 26 July 2022 Paper

Range enhancement of the dynamic frequency measurement in phase-sensitive OTDR with a symmetric fiber interferometer

Zhenshi Sun, Kun Liu, Junfeng Jiang, Kang Xue, Yuelang Huang, Tiegen Liu

Proceedings Volume 12279, 1227906 (2022) https://doi.org/10.1117/12.2616395

KEYWORDS: Demodulation, Signal to noise ratio, Signal detection, Modulation, Sensors, Optical filters, Backscatter, Reflectometry, Sensing systems, Interferometers

Read Abstract +

Proceedings Article | 26 July 2022 Paper

A denoising and positioning method of long-distance fiber optic perimeter security system based on φ-OTDR

Sichen Li, Kun Liu, Junfeng Jiang, Zhenshi Sun, Kang Xue, Yuelang Huang, Xibo Jin, Tiegen Liu

Proceedings Volume 12279, 122790S (2022) https://doi.org/10.1117/12.2616554

KEYWORDS: Denoising, Image denoising, Discrete wavelet transforms, Interference (communication), Wavelets, Signal processing, Raman spectroscopy, Optical fiber cables, Signal to noise ratio

Read Abstract +

Proceedings Article | 26 July 2022 Paper

Highly sensitive optical fiber micro-cavity sensors

Junfeng Jiang, Kun Liu, Shuang Wang, Tianhua Xu, Xuezhi Zhang, Panpan Niu, Yize Liu, Ziyihui Wang, Zhe Yu, Tiegen Liu

Proceedings Volume 12279, 1227902 (2022) https://doi.org/10.1117/12.2616471

KEYWORDS: Fiber optics sensors, Sensors, Optical fibers, Liquid crystals, Fiber lasers, Nanoparticles, Microfluidics, Magnetic sensors

Read Abstract +

Proceedings Article | 26 July 2022 Paper

A fast endpoint detection algorithm for dual Mach-Zehnder interferometer vibration sensing system

Yuelang Huang, Kun Liu, Junfeng Jiang, Zhenshi Sun, Xibo Jin, Kang Xue, Sichen Li, Tiegen Liu

Proceedings Volume 12279, 122790O (2022) https://doi.org/10.1117/12.2616436

KEYWORDS: Signal to noise ratio, Signal detection, Sensing systems, Signal processing, Mach-Zehnder interferometers, Detection and tracking algorithms, Sensors, Optical fibers

Read Abstract +

Proceedings Article | 26 July 2022 Paper

Pattern recognition using multi-dimensional hybrid feature extraction scheme in optical fiber distributed vibration sensing system

Kang Xue, Kun Liu, Junfeng Jiang, Zhenshi Sun, Yuelang Huang, Sichen Li, Xibo Jin, Tiegen Liu

Proceedings Volume 12279, 122790B (2022) https://doi.org/10.1117/12.2616437

KEYWORDS: Feature extraction, Sensing systems, Optical fibers, Wavelets, Wavelet packet decomposition, Sensors, Fiber optics, Signal detection

Read Abstract +

Proceedings Article | 26 July 2022 Paper

Whisker array based on fiber Bragg grating for surface shape sensing

Haokun Yang, Shuang Wang, Kun Liu, Chenyu Fang, Zhiyuan LI, Jinglong Zhang, Tiegen Liu

Proceedings Volume 12279, 1227905 (2022) https://doi.org/10.1117/12.2616426

KEYWORDS: Fiber Bragg gratings, Sensors, Calibration, Optical fibers, Spatial resolution, Environmental sensing, Distance measurement, Signal processing, Shape analysis, Reconstruction algorithms

Read Abstract +

Proceedings Article | 26 July 2022 Paper

Application of SVM algorithm based on thulium doped fiber ring system in ammonia quantitative analysis

Jifang Shan, Kun Liu, Junfeng Jiang, Yafan Li, Tiegen Liu

Proceedings Volume 12279, 122790P (2022) https://doi.org/10.1117/12.2616443

KEYWORDS: Quantitative analysis, Absorption, Statistical modeling, Thulium, Sensing systems, Data modeling, Fiber lasers, Optimization (mathematics)

Read Abstract +

Proceedings Article | 26 July 2022 Paper

Increase demodulation rate of optical fiber distribution acoustic sensing

Yixuan Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Zhenyang Ding, Tianhua Xu, Tiegen Liu

Proceedings Volume 12279, 1227909 (2022) https://doi.org/10.1117/12.2616538

KEYWORDS: Demodulation, Acoustics, Signal detection, Data acquisition, Signal processing, Optical fibers, Data processing, Spatial resolution, Optical sensing, Parallel computing

Read Abstract +

Proceedings Article | 8 July 2022 Paper

Fiber optic SPR sensor based on the heterostructure of MoS2/WS2 with high figure of merit

Jianying Jing, Kun Liu, Junfeng Jiang, Tianhua Xu, Shuang Wang, Jinying Ma, Zhao Zhang, Wenlin Zhang, Tiegen Liu

Proceedings Volume 12283, 1228305 (2022) https://doi.org/10.1117/12.2616434

KEYWORDS: Sensors, Fiber optics sensors, Surface plasmons, Fiber optics, Refractive index, Optical fibers

Read Abstract +

Proceedings Article | 15 October 2021 Paper

Highly sensitive temperature sensor with optomechanofluidic resonators

Yize Liu, Junfeng Jiang, Kun Liu, Shuang Wang, Panpan Niu, Tong Wang, Tiegen Liu

Proceedings Volume 11901, 119010D (2021) https://doi.org/10.1117/12.2602546

KEYWORDS: Resonators, Sensors, Temperature sensors, Oscillators, Capillaries

Read Abstract +

Proceedings Article | 9 October 2021 Presentation + Paper

High sensitivity distributed static strain sensing based on all grating optical fiber in optical frequency domain reflectometry

Chenhuan Wang, Kun Liu, Yuanyao Li, Dongfang Zhu, Ming Pan, Zeen Chen, Haohan Guo, Yin Yu, Junfeng Jiang, Tiegen Liu

Proceedings Volume 11901, 119010C (2021) https://doi.org/10.1117/12.2601073

KEYWORDS: Optical fibers, Signal to noise ratio, Spatial resolution, Reflectometry, Polarization, Single mode fibers, Interferometers, Sensing systems, Fiber Bragg gratings, Interference (communication)

Read Abstract +

Proceedings Article | 9 October 2021 Presentation + Paper

Optical fiber probe for CARS spectroscopy

Tong Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Panpan Niu, Yize Liu, Tiegen Liu

Proceedings Volume 11901, 119010F (2021) https://doi.org/10.1117/12.2602310

KEYWORDS: Optical fibers, Raman spectroscopy, Spectroscopy, Signal detection

Read Abstract +

Proceedings Article | 9 October 2021 Paper

Increase measurement range, distance, and speed of optical fiber distribution acoustic sensing

Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Guanghua Liang, Yixuan Wang, Tiegen Liu

Proceedings Volume 11902, 1190206 (2021) https://doi.org/10.1117/12.2602101

KEYWORDS: Distance measurement, Phase shift keying, Modulation, Acoustics, Fiber Bragg gratings, Optical fibers, Signal to noise ratio, Demodulation, Optical sensing, Graphics processing units

Read Abstract +

Proceedings Article | 10 October 2020 Presentation + Paper

Low detection limit refractive index sensor based on open microcavity Mach-Zehnder interferometer and fiber ring laser

Panpan Niu, Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Yongning Zhang, Wenjie Chen, Tong Wang, Tiegen Liu

Proceedings Volume 11554, 115540D (2020) https://doi.org/10.1117/12.2575029

KEYWORDS: Fiber lasers, Optical microcavities, Sensors, Mach-Zehnder interferometers, Refractive index, Optical fibers, Single mode fibers, Manufacturing, Multimode fibers, Liquids

Read Abstract +

Proceedings Article | 10 October 2020 Presentation + Paper

Pendulum-style adjustment of captured particles with fiber tweezers based on asymmetrical fiber tip for CARS system

Tong Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Yongning Zhang, Panpan Niu, Tiegen Liu

Proceedings Volume 11554, 1155407 (2020) https://doi.org/10.1117/12.2575064

KEYWORDS: Optical fibers, Microscopes, Biological detection systems

Read Abstract +