Shape measurement and vibration analysis of moving speaker cone

Qican Zhang; Yuankun Liu; Petri Lehtonen

doi:10.1117/12.2054026

2 June 2014 Shape measurement and vibration analysis of moving speaker cone

Qican Zhang, Yuankun Liu, Petri Lehtonen

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 92340T (2014) https://doi.org/10.1117/12.2054026
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

Abstract

Surface three-dimensional (3-D) shape information is needed for many fast processes such as structural testing of material, standing waves on loudspeaker cone, etc. Usually measurement is done from limited number of points using electrical sensors or laser distance meters. Fourier Transform Profilometry (FTP) enables fast shape measurement of the whole surface. Method is based on angled sinusoidal fringe pattern projection and image capturing. FTP requires only one image of the deformed fringe pattern to restore the 3-D shape of the measured object, which makes real-time or dynamic data processing possible. In our experiment the method was used for loudspeaker cone distortion measurement in dynamic conditions. For sound quality issues it is important that the whole cone moves in same phase and there are no partial waves. Our imaging resolution was 1280x1024 pixels and frame rate was 200 fps. Using our setup we found unwanted spatial waves in our sample cone.

Citation Download Citation

Qican Zhang, Yuankun Liu, and Petri Lehtonen "Shape measurement and vibration analysis of moving speaker cone", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 92340T (2 June 2014); https://doi.org/10.1117/12.2054026

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KEYWORDS

Distortion

Fringe analysis

Shape analysis

Vibrometry

Cameras

Fourier transforms

3D image processing

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