1. Articles from Jianfeng Zhong

    1-3 of 3
    1. Full range line-field optical coherence tomography for high-accuracy measurements of optical lens

      Full range line-field optical coherence tomography for high-accuracy measurements of optical lens

      A full range line-field Fourier domain optical coherence tomography system (LF-FDOCT) with an accuracy at nanoscale was proposed for high-accuracy measurements of optical lens surface profile. The line-field surface curve information of optical lens could be obtained in one measurement which does not need point-by-point scanning used in traditional one-dimensional FDOCT system. The measurement accuracy of surface profile curve could be improved from micrometer scale to nanoscale by applying spectral centre correction method (SCCM) to the complex spectral interferogram. The corrected five phase shifting (CFPS) method was employed to eliminate the complexconjugate artifacts and the polychromatic error. Numerical simulation and ...

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    2. High-performance optical coherence velocimeter: theory and applications

      High-performance optical coherence velocimeter: theory and applications

      We proposed a high-performance optical coherence velocimeter (OCV) based on broadband optical interference which achieves spatial resolution from interference cancellation or enhancement of different components of the broadband light. There is a challengeable issue for OCV that the interference fringes become blurred when the velocity of detected object is relatively large, hindering the pace of OCV application in high-velocity field. To resolve this, the relationship between blurry coefficient and OCV system parameters (e.g., exposure time, central wavelength, bandwidth of source) was derived. It was found that blurry coefficient changed with oscillatory decay form and reached the minimum at each ...

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    3. Two-dimensional optical coherence tomography for real-time structural dynamical characterization

      Two-dimensional optical coherence tomography for real-time structural dynamical characterization

      We present a two-dimensional optical coherence vibration tomography (2DOCVT) system with an ultra-precision displacement resolution of ~0.1 nm that is capable of in site real-time absolute displacement measurement of structural line vibrations. Experimental results of sinusoidal, sweep and impulse vibrations were reported. The key figures of merit such as the 2DOCVT system could obtain fast line vibration measurement without scanning and it also could be used to capture structural modal parameters in one single impulse excitation measurement without any vibration excitation input information, making it attractive for the application in low-frequency vibration measurement and response-only modal analysis.

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    1-3 of 3
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  2. Topics in the News

    1. (1 articles) Shanghai Jiao Tong University
    2. (1 articles) Universidade Federal de São Paulo
    3. (1 articles) Dresden University of Technology
    4. (1 articles) University of Freiburg
    5. (1 articles) Francesco Prati
    6. (1 articles) Edmund Koch
    7. (1 articles) Lars Kirsten
    8. (1 articles) Topcon Medical Systems
    9. (1 articles) Carl Zeiss Meditec
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