Dr. Zhiyong Dai Profile

Dr. Zhiyong Dai

at Univ of Electronic Science and Technology of China

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Author

Publications (14)

Proceedings Article | 13 December 2023 Paper

A novel method for direct measurement of spark energy

Gang Yu, Zhenjie Shang, Xiameng Zhang, Rui Liu, Zhiyong Dai

Proceedings Volume 12942, 129420B (2023) https://doi.org/10.1117/12.3007010

KEYWORDS: Photodetectors, Oscilloscopes, Emission wavelengths, Electromagnetic interference, Thermal effects, Signal detection, Signal processing, Pulse signals, Design and modelling, Combustion

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Spark energy is one of the most important indicators for evaluating the performance of electric ignition systems. The development of electric ignition systems requires accurate measurement of spark energy to optimize system design parameters.The traditional oscilloscope test method calculates the spark energy by measuring the discharge electric energy. There is a serious energy conversion error, and the accurate measurement of spark energy cannot be realized. In this paper, based on radiation energy detection, a new method for direct measuring spark energy is reported. The multiband photodetector is used to conduct spatial sampling and spectral integration of the spark radiation energy. Then, using the high-speed response capability of the photodetector, high-precision measurement of spark energy is achieved by combining the time domain waveform of the spark pulse with the time integration of the spark radiation power. The experimental system can sample the spark radiant energy in 200nm~12,000nm spectral range by using 12 photodetectors, which is divided into four wavebands, and realize the direct test output of spark energy. The energy testing results show that the precision and stability of spark energy measurement are better than 5%. On the one hand, the method utilizes photodetectors to detect the radiation energy produced by electrical sparks and directly obtain the spark energy without requiring conversion between different forms of energy. Therefore, this approach offers higher measurement accuracy. On the other hand, the method takes advantage of the natural electromagnetic interference immunity of optical measurement techniques, which can effectively address the issue of strong electromagnetic interference caused by the electrical ignition system in oscilloscope methods. This can prevent distorted test results and ensure the ability to complete normal tests. Further studies show that the method can be used for accurate measurement of spark energy.

Proceedings Article | 12 March 2019 Paper

Optical fiber gas sensor based on organic polymer

Zinan Wu, Donglin Tang, Yanyan Wang, Zhiyong Dai

Proceedings Volume 11023, 1102313 (2019) https://doi.org/10.1117/12.2521223

KEYWORDS: Polymers, Optical fibers, Hydrogen, Refractive index, Gas sensors, Photorefractive polymers, Polymer optical fibers, Absorption, Gases, Polymeric sensors

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Proceedings Article | 29 August 2013 Paper

Study of the polarization maintaining optical fiber beat length variation with external force

Zhonghua Ou, Ping Sun, Yu Chen, Jian-feng Li, Yong Liu, Huimin Yue, Zhiyong Dai, Lixun Zhang

Proceedings Volume 8914, 89140T (2013) https://doi.org/10.1117/12.2034285

KEYWORDS: Polarization maintaining fibers, Optical fibers, Sagnac interferometers, Polarization, Sensors, Birefringence, Optical sensing, Fiber optic communications, Optical communications, Numerical analysis

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Proceedings Article | 13 November 2010 Paper

Optical fiber sensors for landslide monitoring

Yong Liu, Zhiyong Dai, Xiaoxia Zhang, Zengshou Peng, Jianfeng Li, Zhonghua Ou, Yongzhi Liu

Proceedings Volume 7844, 78440D (2010) https://doi.org/10.1117/12.873913

KEYWORDS: Landslide (networking), Fiber optics sensors, Sensors, Spatial resolution, Polarization, Sensing systems, Fiber lasers, Phase modulation, Modulators, Backscatter

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Proceedings Article | 13 October 2010 Paper

Distributed fiber optic stress sensor system based on P-OFDR

Zhiyong Dai, Xiaoxia Zhang, Zengshou Peng, Jianfeng Li, Zhonghua Ou, Yongzhi Liu

Proceedings Volume 7659, 765914 (2010) https://doi.org/10.1117/12.866062

KEYWORDS: Fiber lasers, Fiber optics sensors, Polarization, Fiber Bragg gratings, Spatial resolution, Sensors, Fabry–Perot interferometers, Fiber optics, Phase modulation, Backscatter

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Proceedings Article | 10 February 2009 Paper

Research of narrow line-width Er3+-doped fiber ring laser with FBG F-P etalon and FBG Sagnac loop

Zhonghua Ou, Zhiyong Dai, Bo Wu, Lixun Zhang, Zengshou Peng, Yongzhi Liu

Proceedings Volume 7158, 71581F (2009) https://doi.org/10.1117/12.811021

KEYWORDS: Fiber Bragg gratings, Fiber lasers, Fabry–Perot interferometers, Semiconductor lasers, Hole burning spectroscopy, Stereolithography, Optical filters, Sensing systems, Erbium, Single mode fibers

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Proceedings Article | 9 February 2009 Paper

Stable narrow linewidth ring fiber laser with a passive fiber Bragg grating Fabry-Perot etalon and a fiber saturable absorber

Zhiyong Dai, Bo Wu, Zengshou Peng, Zhonghua Ou, Yongzhi Liu

Proceedings Volume 7158, 715817 (2009) https://doi.org/10.1117/12.806925

KEYWORDS: Fiber Bragg gratings, Fiber lasers, Fabry–Perot interferometers, Spatial light modulators, Reflectivity, Reflectors, Spectrum analysis, Fiber optics sensors, Wavelength tuning, Optical isolators

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Proceedings Article | 3 February 2009 Paper

Research of surface plasma resonance optical fiber hydrogen sensor

Zhonghua Ou, Xiaowei Guo, Dejun Chen, Zhiyong Dai, Zengshou Peng, Yongzhi Liu

Proceedings Volume 7157, 715716 (2009) https://doi.org/10.1117/12.807109

KEYWORDS: Hydrogen, Head, Plasma, Sensors, Palladium, Optical fibers, Multimode fibers, Refractive index, Manufacturing, Thin films

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Proceedings Article | 3 February 2009 Paper

A high precision metrology method and system for thin film's parameters based on reflectance spectrum

Zhiyong Dai, Zengshou Peng, Zhonghua Ou, Yongzhi Liu, Lixun Zhang

Proceedings Volume 7160, 71602P (2009) https://doi.org/10.1117/12.807076

KEYWORDS: Thin films, Reflectivity, Metrology, Reflection, Data modeling, Refractive index, Spectroscopy, Computing systems, Error analysis, Zinc

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Proceedings Article | 16 May 2008 Paper

Research on high-resolution distributed fiber optic stress sensor for landslide monitoring

Zhiyong Dai, Yongzhi Liu, Lixun Zhang, Zhonghua Ou, Ce Zhou

Proceedings Volume 7004, 70042T (2008) https://doi.org/10.1117/12.786027

KEYWORDS: Landslides, Fiber optics sensors, Sensors, Fiber optics, Modulators, Polarization, Spatial resolution, Signal processing, Michelson interferometers, Optical sensing

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Proceedings Article | 16 May 2008 Paper

Measurement of spontaneous Brillouin scattering in optical fiber with a fiber Bragg grating Sagnac loop

Zhonghua Ou, Lixun Zhang, Zhiyong Dai, Yongzhi Liu

Proceedings Volume 7004, 70043Z (2008) https://doi.org/10.1117/12.786070

KEYWORDS: Fiber Bragg gratings, Scattering, Optical filters, Rayleigh scattering, Sensing systems, Light scattering, Optical fibers, Interferometers, Scatter measurement, Digital signal processing

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Proceedings Article | 6 February 2008 Paper

Research on SBS and pulse pumped hybrid Q-switched Er3+/Yb3+ co-doped fiber laser

Zhiyong Dai, Zhengshou Peng, Yongzhi Liu, Zhonghua Ou

Proceedings Volume 6823, 68231C (2008) https://doi.org/10.1117/12.757817

KEYWORDS: Fiber lasers, Q switched lasers, Q switched fiber lasers, Interferometers, Erbium, Ytterbium, Fiber Bragg gratings, Pulsed laser operation, Q switching, Q switches

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Proceedings Article | 6 February 2008 Paper

Optimization of amplifying fiber length in rapidly Q-switched double-clad fiber lasers

Lin Huang, Yongzhi Liu, Qianshu Zhang, Zhiyong Dai

Proceedings Volume 6823, 682314 (2008) https://doi.org/10.1117/12.756189

KEYWORDS: Reflectivity, Output couplers, Fiber amplifiers, Fiber lasers, Q switched fiber lasers, Q switched lasers, Pulsed laser operation, Numerical analysis, Broadband telecommunications, Q switches

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Proceedings Article | 4 October 2006 Paper

Research on the passively mode-locked Er3+-doped fiber laser

Zhiyong Dai, Deshuang Zhao, Yongzhi Liu

Proceedings Volume 6351, 63513R (2006) https://doi.org/10.1117/12.688677

KEYWORDS: Mode locking, Fiber lasers, Output couplers, Amplifiers, Erbium, Fiber amplifiers, Solitons, Dispersion, Optical amplifiers, Pulsed laser operation

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Showing 5 of 14 publications

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