Study on phase demodulation based on S-transform filtering method in fringe analysis
| Autor: | 陈文静 Cheng Wenjing, 苏显渝 Su Xianyu, 郑毅 Zheng Yi, 蒋模华 Jiang Mohua |
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| Rok vydání: | 2013 |
| Předmět: |
Non-uniform discrete Fourier transform
Short-time Fourier transform Atomic and Molecular Physics and Optics Fractional Fourier transform symbols.namesake Multidimensional signal processing Fourier transform Statistics symbols Harmonic wavelet transform S transform Algorithm Constant Q transform Mathematics |
| Zdroj: | Optical Technique. 39:331-338 |
| ISSN: | 1002-1582 |
| Popis: | The S-transform,an intermediate step between the wavelet transform and the windowed Fourier transform,is a strong tool to analyze the non-stationary signals,which can be used to transform the local component of a onedimensional signal into a function with time and frequency parameters,and furthermore,the whole Fourier spectra of the signal can be gotten by the average operation over the time axis.Designing suitable filters to extract the local fundamental component of the Stransform spectra are a key part in fringe analysis based on Stransform.Several filtering procedures are designed to obtain the useful local fundamental spectrum fromStransform spectra,including the threshold filtering,the flat-top Hanning filtering and Gaussian filtering before and after ridge fitting processing,respectively.Averaging the filtered fundamental Stransform spectra,the whole Fourier transform fundamental spectra of the tested signal can be obtained,which can be used to reconstruct the surface distribution of the tested object.Computer simulations and experiments are employed to compare the results of these filtering processing. |
| Databáze: | OpenAIRE |
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