Low-frequency harmonic vibration analysis with temporal speckle pattern interferometry |
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Authors: | Xide Li Gang Tao |
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Institution: | Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, People's Republic of China |
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Abstract: | In this paper, the time sequence phase method (TSPM) has been applied to measure the displacement caused by low-frequency vibration in temporal speckle pattern interferometry (TSPI). The principle is that by capturing the temporal speckle patterns related to the object vibration, the whole-field displacement responses (amplitude and phase) of the vibrating object can be calculated through scanning these fluctuations. Thus, quantitative measurement can be carried out using a conventional ESPI system without a camera synchronized to the object vibration or a phase shifting system. The elaboration on the method is given and experimental results are presented. |
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Keywords: | Temporal speckle pattern interferometry Phase measurement Harmonic vibration |
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