Shape measurement and vibration analysis of moving speaker cone

Q. Zhang, Y. Liu, Petri Lehtonen

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

2 Citations (Scopus)

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
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationVolume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 2013
PublisherInternational Society for Optics and Photonics SPIE
Volume9234
ISBN (Print)978-162841288-8
DOIs
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Experimental Mechanics 2013, ICEM 2013 and the 12th Asian Conference on Experimental Mechanics, ACEM 2013 - Bangkok, Thailand
Duration: 25 Nov 201327 Nov 2013

Publication series

SeriesProceedings of SPIE
Volume9234
ISSN0277-786X

Conference

ConferenceInternational Conference on Experimental Mechanics 2013, ICEM 2013 and the 12th Asian Conference on Experimental Mechanics, ACEM 2013
Abbreviated titleICEM 2013, ACEM 2013
CountryThailand
CityBangkok
Period25/11/1327/11/13

Keywords

  • data processing
  • distortion
  • Fourier transforms
  • Fringe analysis
  • image acquisition
  • lasers
  • sensors
  • vibrometry
  • loudspeakers
  • high-speed imaging
  • standing waves

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