Estudo comparativo sobre filtragem de sinais instrumentais usando transformadas de Fourier e Wavelet

Química Nova

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