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Approach to frequency estimation in self-mixing interferometry: multiple signal classification.
Appl Opt ; 52(14): 3345-50, 2013 May 10.
Artigo em Inglês | MEDLINE | ID: mdl-23669850
ABSTRACT
Based on the nature of self-mixing signals, we propose the use of the multiple signal classification (MUSIC) algorithm in place of the fast Fourier transform (FFT) for processing signals obtained from self-mixing interferometry (SMI). We apply this algorithm to two representative SMI measurement techniques range finding and velocimetry. Applying MUSIC to SMI range finding, we find its signal-to-noise ratio performance to be significantly better than that of the FFT, allowing for more robust, longer-range measurement systems. We further demonstrate that MUSIC enables a fundamental change in how SMI Doppler velocity measurement is approached, letting one discard the complex fitting procedure and allowing for a real-time frequency estimation process.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Appl Opt Ano de publicação: 2013 Tipo de documento: Artigo País de afiliação: Austrália