Mr. Zhenhong Sun Profile

Zhenhong Sun

Masters Candidate at Nanjing Univ

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Author

Publications (5)

Proceedings Article | 21 July 2017 Paper

A BandMax and spectral angle mapper based alogrithm for white blood cell segmentation

Xiyue Hou, Mei Zhou, Zhen Sun, Qingli Li, Yingying Xue, Hongying Liu, Yiting Wang

Proceedings Volume 10420, 104202B (2017) https://doi.org/10.1117/12.2281991

KEYWORDS: Blood, Image segmentation, Hyperspectral imaging

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Proceedings Article | 31 October 2016 Paper

A distributed optical fiber sensing system for dynamic strain measurement based on artificial reflector

Zhenhong Sun, Yuanyuan Shan, Yanting Li, Yixin Zhang, Xuping Zhang

Proceedings Volume 10019, 100190R (2016) https://doi.org/10.1117/12.2245811

KEYWORDS: Optical fibers, Sensing systems, Reflectors, Aluminum, Ferroelectric materials, Connectors, Amplitude modulation, Avalanche photodetectors, Linear filtering, Signal to noise ratio

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Phase sensitive optical time domain reflectometry (Φ-OTDR) has been widely used in many applications for its distributed sensing ability on weak disturbance all along the sensing fiber. However, traditional Φ-OTDR cannot make quantitative measurement on the external disturbance due to the randomly distributed position and reflectivity of scatters within the optical fiber. Recently, some methods have been proposed to realize quantitative measurement of dynamic strain. In these literatures, the fiber with or without FBGs in practice was easily damaged and with difficulty of maintenance. PZT is employed to generate strain event in the fiber. There is a large gap compared with the real detecting environment, which will not reveal the full performance of the sensing system. In this paper, a distributed optical fiber sensing (DOFS) system for dynamic strain measurement based on artificial reflector is proposed and demonstrated experimentally. The fiber under test (FUT) is composed by four 20-meter long single mode optical fiber patch cords (OFPCs), which are cascaded with ferrule contactor/physical contact (FC/PC) connectors via fiber flanges. The fiber facet of FC/PC connector forms an artificial reflector. When the interval between the two reflectors is changed, the phase of the interference signal will also be changed. A symmetric 3×3 coupler with table-look-up scheme is introduced to discriminate the phase change through interference intensity. In our experiment, the center 10m section of the second OFPC is attached to the bottom of an aluminum alloy plate. An ordinary loudspeaker box was located on the top of the aluminum alloy plate. The dynamic strain generated by the loudspeaker box is transmitted from the aluminum alloy plate to the OFPC. Experimental results show that the proposed method has a good frequency response characteristic up to 3.2 kHz and a linear intensity response of R2=0.9986 while the optical probe pulse width and repetition rate were 100ns and 10 kHz respectively. Meanwhile, triangle and cosine amplitude-modulated (AM) dynamic strain applied on the fiber are successfully discriminated. The artificial reflectors based on FC/PCs were easily assembled and maintained, and the method of vibration transmission closely resembled the real circumstance than PZT. Therefore, these advantages will extend the potential of this Φ-OTDR technology in structure health monitoring.

SPIE Journal Paper | 6 September 2016

Enhanced ν-optical time domain reflectometry using gigahertz sinusoidally gated InGaAs/InP single-photon avalanche detector

Xuping Zhang, Yuanlei Shi, Yuanyuan Shan, Zhenhong Sun, Weiyan Qiao, Yixin Zhang

OE, Vol. 55, Issue 09, 094101, (September 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.9.094101

KEYWORDS: Optical engineering, Spatial resolution, Sensors, Reflectometry, Single photon detectors, Time metrology, Pulsed laser operation, Single mode fibers, Quantum efficiency, Connectors

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SPIE Journal Paper | 21 July 2016

Polarization dependence of phase-sensitive optical time-domain reflectometry and its suppression method based on orthogonal-state of polarization pulse pair

Yixin Zhang, Yemian Xu, Yuanyuan Shan, Zhenhong Sun, Fan Zhu, Xuping Zhang

OE, Vol. 55, Issue 07, 074109, (July 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.7.074109

KEYWORDS: Polarization, Birefringence, Reflectometry, Sensing systems, Optical engineering, Signal to noise ratio, Sun, Fluctuations and noise, Interference (communication), Phase modulation

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SPIE Journal Paper | 9 May 2016

Enhanced Φ-OTDR system for quantitative strain measurement based on ultra-weak fiber Bragg grating array

Xuping Zhang, Zheng Guo, Yuanyuan Shan, Zhenhong Sun, Siyi Fu, Yixin Zhang

OE, Vol. 55, Issue 05, 054103, (May 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.5.054103

KEYWORDS: Spatial resolution, Ferroelectric materials, Signal detection, Fiber Bragg gratings, Sensors, Optical engineering, Reflectivity, Signal attenuation, Phase shifts, Sun

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