オーバーサンプリングFFTと波形解析への応用

概要

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The fast Fourier transform is very often used when time or spatial signals must be decomposed into their components. Zoom-FFT can be used if the resolving power of frequency should be increased to precisely determine the time or spatial frequencies and the phase angles of the components. However, the zoom-FFT requires many periods of the signals for that purpose. Nevertheless, there are many cases in which the resolving power of frequency must be increased even when only one period of the signals is on hand or can be obtained from the property of the measurement. This paper describes the equation and the calculation procedure of oversampling fast Fourier transform, which is useful in these cases, and confirms that the derived oversampling FFT is effective through applying it as an example to precisely determine the spatial frequencies and the phase angles of interference fringes in a speckle detected in an experiment on in-plane vibration measurement.
社団法人日本機械学会の論文
1991-09-25