Real-time monitoring of structural vibration using spectral-domain optical coherence tomography |
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Authors: | Shuncong Zhong Hao Shen |
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Institution: | a Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK b School of Mechanical Engineering and Automation, Fuzhou University, PR China |
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Abstract: | We report in this paper the development of a spectral-domain optical coherence vibration tomography (OCVT) using a broadband CCD-based spectrometer and a short-coherence white light source. We demonstrate that both the vibration amplitude and frequency can be quantified, in the frequency range 0-250 Hz, with an axial resolution of 1 μm. Furthermore, the inner structure (layer thickness) of a vibrating sample can also be quantified simultaneously. The developed OCVT is non-contact and noninvasive in nature, thus is ideal for real time and in situ monitoring of low-frequency micro-vibrations that have critical impacts on many high-precision manufacturing and engineering processes. |
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Keywords: | Structural vibration Optical coherence tomography Non-destructive testing |
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