Loudspeaker Analysis: A Radar Based Approach

Research output: Contribution to journalArticle

Abstract

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.
Index Terms - Radar, micro-Doppler, micro-Doppler analysis, loudspeaker analysis, industrial processes.
Original languageEnglish
Article number10.1109/JSEN.2019.2946987
Number of pages15
JournalIEEE Sensors Journal
DOIs
Publication statusE-pub ahead of print - 11 Oct 2019

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