Fast shape and deformation measurement of moving speaker cone

Petri Lehtonen, Q. Zhang, Y. Liu

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Surface 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 Prolometry (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 3D 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.
Original languageEnglish
Title of host publicationProceedings of the 30th International Congress on High-Speed Imaging and Photonics (ICHSIP30)
Pages103-108
Publication statusPublished - 2013
MoE publication typeNot Eligible
Event30th International Congress on High-Speed Imaging and Photonics, ICHSIP30 - Pretoria, South Africa
Duration: 16 Sep 201321 Sep 2013

Conference

Conference30th International Congress on High-Speed Imaging and Photonics, ICHSIP30
Abbreviated titleICHSIP30
CountrySouth Africa
CityPretoria
Period16/09/1321/09/13

Keywords

  • high-speed
  • imaging
  • shape measurement
  • standing waves
  • loudspeaker

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  • Cite this

    Lehtonen, P., Zhang, Q., & Liu, Y. (2013). Fast shape and deformation measurement of moving speaker cone. In Proceedings of the 30th International Congress on High-Speed Imaging and Photonics (ICHSIP30) (pp. 103-108)