Química Nova | |
Estudo comparativo sobre filtragem de sinais instrumentais usando transformadas de Fourier e Wavelet | |
Roberto Kawakami Harrop Galvão2  Mário César Ugulino De Araújo1  Teresa Cristina Bezerra Saldanha1  Valeria Visani1  Maria Fernanda Pimentel1  | |
[1] ,Instituto Tecnológico de Aeronáutica Divisão de Engenharia Eletrônica São José dos Campos SP | |
关键词: instrumental signal denoising; Fourier transform; wavelet transform; | |
DOI : 10.1590/S0100-40422001000600026 | |
来源: SciELO | |
【 摘 要 】
A comparative study of the Fourier (FT) and the wavelet transforms (WT) for instrumental signal denoising is presented. The basic principles of wavelet theory are described in a succinct and simplified manner. For illustration, FT and WT are used to filter UV-VIS and plasma emission spectra using MATLAB software for computation. Results show that FT and WT filters are comparable when the signal does not display sharp peaks (UV-VIS spectra), but the WT yields a better filtering when the filling factor of the signal is small (plasma spectra), since it causes low peak distortion.
【 授权许可】
CC BY-NC
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
【 预 览 】
Files | Size | Format | View |
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RO202005130060958ZK.pdf | 248KB | download |