Comparison of FFT and LMS applied to photoacoustic signal detection

Tomasz Starecki; Tomasz Owczarek

doi:10.1117/12.784664

28 December 2007 Comparison of FFT and LMS applied to photoacoustic signal detection

Tomasz Starecki, Tomasz Owczarek

Proceedings Volume 6937, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2007; 69370Z (2007) https://doi.org/10.1117/12.784664
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2007, 2007, Wilga, Poland

Abstract

Photoacoustic measurements are quite often performed by means of data acquisition systems that collect samples of the photoacoustic signal, and use the samples for the purpose of calculation of the amplitude of its fundamental frequency. The most common method of such calculations is the FFT, but the amplitude can be also obtained by means of the least mean square (LMS) method. The paper compares properties of both methods from the point of view of their numerical efficiency and errors vs. S/N ratio and number of samples per period of the investigated signal. The discussion shows that in the case of an integer number of periods sampled, results of the FFT and LMS are identical, but due to higher numerical efficiency the LMS method should be used.

Citation Download Citation

Tomasz Starecki and Tomasz Owczarek "Comparison of FFT and LMS applied to photoacoustic signal detection", Proc. SPIE 6937, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2007, 69370Z (28 December 2007); https://doi.org/10.1117/12.784664

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