Loudspeaker analysis: a radar based approach

Alessio Izzo, Ludovico Ausiello, Carmine Clemente, John J. Soraghan

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Recently, radar based micro-Doppler signature analysis has been successfully applied in various sectors including defence, biomedical, and automotive. This article presents the novel use of radar micro-Doppler for loudspeaker analysis. The approach offers the potential benefits of characterizing the mechanical motion of a loudspeaker in order to identify defects and design issues. Compared with acoustic based approaches, the use of radar allows reliable measurements in an acoustically noisy end of a production line. In addition, when compared with a laser vibrometric approach, the use of radar micro-Doppler reduces the number of measurements required and provides direct access to the information of the metallic components of the loudspeaker.In the paper experimental results and analysis of the micro-Doppler signatures of loudspeakers using low cost radar systems are presented. Based on Thiele&Small parameters, the voice coil displacement is modelled and micro-Dopplersignatures for a single tone and a sine sweep stimulus are presented. Furthermore, in order to characterise the speaker with a single radar measurement, a methodology to measure mechanical frequency response of loudspeakers is also shown.
Original languageEnglish
Pages (from-to)1223-1237
Number of pages15
JournalIEEE Sensors Journal
Issue number3
Early online date11 Oct 2019
Publication statusPublished - 1 Feb 2020


  • radar
  • micro-Doppler
  • micro-Doppler analysis
  • loudspeaker analysis
  • industrial processes


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