1. Articles from Yingjie Yu

    1-3 of 3
    1. Anti-noise frequency estimation performance of Hanning-windowed energy centrobaric method for optical coherence velocimeter

      Anti-noise frequency estimation performance of Hanning-windowed energy centrobaric method for optical coherence velocimeter

      The Optical Coherence Velocimeter (OCV) technology is a technique for high-precision displacement and vibration measurement based on the principle of spectral domain optical coherence method. The key of this technology is to realize nanometer or even sub-nanometer measurement by high precision frequency estimation method called as Hanning-window energy centrobaric method (HnWECM). This paper analyses the error transmission process of HnWECM, and proposes a calculation method based on Paserval's theorem to establishes the accuracy theory of HnWECM. It shows that the variance of the estimated frequency using HnWECM is only proportional to the signal-to-noise ratio (SNR) and very close to ...

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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. Analytical method for designing gradient-index fiber probes

      Analytical method for designing gradient-index fiber probes
      An analytical method was investigated to design the gradient-index (GRIN) fiber probe based on characteristic parameters of a Gaussian beam propagating through the probe. First, a typical model of the GRIN fiber probe was presented, consisting of a single mode fiber, a no-core fiber (NCF), and a GRIN fiber lens. Second, a complex beam parameter matrix transformation method was adopted to derive the mathematical expressions of characteristic parameters, such as beam waist location, beam waist radius, and Rayleigh range. Then, MATLAB software was used to analyze the impact of the length of NCF and the length of the GRIN fiber ...
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    1-3 of 3
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  2. Topics in the News

    1. (1 articles) National Research Council Canada
    2. (1 articles) Shanghai Jiao Tong University
    3. (1 articles) Youxin Mao
    4. (1 articles) Jikei University School of Medicine
    5. (1 articles) Macquarie University
    6. (1 articles) Medical University of Vienna
    7. (1 articles) University of Florence
    8. (1 articles) National Institutes of Health
    9. (1 articles) Beth Israel Deaconess Medical Center
    10. (1 articles) Giacomo Savini
    11. (1 articles) Bernhard Baumann
    12. (1 articles) Antonia Lichtenegger
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