Analysis of membrane vibration modes based on structured light projection
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1.
Department of Opto-electronics, College of Electronis and Information Engineering, Sichuan University, Chengdu 641004, China
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Corresponding author:
ZHANG Qican, zqc@scu.edu.cm
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Received Date:
2014-07-21
Accepted Date:
2014-08-21
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Abstract
In order to verify membrane vibration modes, sinusoidal fringe projecting and Fourier fringe analysis were used in membrane vibration mode analysis and amplitude reconstruction. After theoretical analysis and experimental verification, among 3-D automatic sensor technologies based on structured light, Fourier transform profilometry (FTP) with the advantages of single-frame capture, high resolution and real-time measurement became the practical method in dynamic three-dimensional shape measurement. A sequence of the deformed and partly blurred sinusoidal fringe images on the surface of a vibrating membrane was grabbed by a low sampling rate CCD camera. By FTP, the actual experimental results of membrane vibration modes at different frequencies were obtained. The theoretical vibration results and the vibration measurement results were compared. The results show that the vibration modes reflect the vibrating membrane accurately. The results of 3-D surface shape measurement and actual experiments give the verification of its validity.
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