Ms. Bing Chen Profile

Bing Chen

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Proceedings Article | 15 February 2024 Paper

Suppression of speckle noise in laser Doppler vibrometry by signal diversity and dynamic ellipse fitting

Zhan Huang, Bing Chen, Yu Fu

Proceedings Volume 13069, 130690V (2024) https://doi.org/10.1117/12.3022588

KEYWORDS: Speckle, Laser Doppler velocimetry, Doppler effect, Interferometers, Vibrometry, Vibration, Demodulation

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The speckle effect caused by coherent light scattering from rough surfaces modulates the intensity and phase of the interference signal, which results in signal dropouts and phase noise for Laser-Doppler vibrometers (LDV), limiting the accuracy and resolution of LDV. Signal diversity has been demonstrated to significantly suppress the speckle noise in single-point LDV vibration measurements since two or more statistically independent reception channels significantly decrease the probability of speckle noise occurring. In this paper, an orthogonal interferometer based on polarization diversity is presented. We discuss the potential of suppressing the speckle noise with dynamic ellipse fitting and dual-channel data fusion. The displacement measurement of LDV is obtained by phase synchronization and a simple weighted sum method. The conclusion of this article is that signal diversity combined with a dynamic ellipse fitting algorithm is feasible to suppress speckle noise resulting from the periodic movement of the target.

Proceedings Article | 27 January 2023 Paper

Modal shapes measurements of a rotating disc using stroboscopic 3D digital image correlation and down-sampling strategy

Ruixin Lin, Zhipeng Sheng, Bing Chen, Zeren Gao, Yu Fu

Proceedings Volume 12550, 1255017 (2023) https://doi.org/10.1117/12.2667027

KEYWORDS: Digital image correlation

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Rotating machinery plays an essential role in aerospace, energy, automotive, and other industries. A resonance phenomenon will occur if the rotational speed of the structure is close to its critical speed. Experimental analysis of the modal shapes of a rotating component at critical speeds can improve its design and performance in applications. Full-field deformation measurements of a rotating structure can be realized by three-dimension digital image correlation(3D-DIC) based on high-speed cameras. However, high-speed cameras are too expensive to apply widely. This study presents a method using 3D-DIC and a down-sampling strategy, which only uses low-cost normal-speed cameras. In order to ensure that two low-speed cameras can synchronously capture images clearly, a synchronous stroboscopic device is used. A measurement experiment was executed on a rotating disc at a critical speed to verify the availability of the method. The experiments show that the out-of-plane displacement of a rotating disc at different critical speeds corresponds to the various orders of modal shape. Compared with the non-resonance state, the out-of-plane deformation of the rotating disc was significant. The results also show the proposed method is a low-cost, non-contact experimental tool to study the dynamic behavior of a rotating component.

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