@inproceedings{09d6313185464345ab432ab660274b84,
title = "Shape measurement and vibration analysis of moving speaker cone",
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",
keywords = "data processing, distortion, Fourier transforms, Fringe analysis, image acquisition, lasers, sensors, vibrometry, loudspeakers, high-speed imaging, standing waves",
author = "Qican Zhang and Yankun Liu and Petri Lehtonen",
year = "2014",
doi = "10.1117/12.2054026",
language = "English",
isbn = "978-1-62841-288-8",
series = "Proceedings of SPIE",
publisher = "International Society for Optics and Photonics SPIE",
editor = "Somnuk Sirisoonthorn",
booktitle = "International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics",
address = "United States",
note = "International Conference on Experimental Mechanics 2013, ICEM 2013 and the 12th Asian Conference on Experimental Mechanics, ACEM 2013, ICEM 2013, ACEM 2013 ; Conference date: 25-11-2013 Through 27-11-2013",
}