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1 Polish Journal of Environmental Studies

1 2005

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Evaluation of electric fields influence on hydrotechnical constructions using STFT

100%

Zakowski K. , Darowicki K.

nr Suppl.1

A method of detection of electric field using the Short Time Fourier Transformation (STFT) is presented. This particular kind of signal analysis makes the determination of changes of the spectral power density of a signal (e.g. structure to electrolyte potential) in function of time possible. The results of joint time-frequency analysis of the potential in the stray currents field are presented. The spectrogram is a composition of spectral lines of defined frequency distribution. A good correlation of localization of spectral lines corresponding to stray current generator and construction potential in time domain is visible. The comparison of time and frequency localization of peaks from spectrograms is unambiguous evidence that the stray current field interfered on the investigated construction. A presented result unambiguously shows the possibility of accurate identification of source of stray currents and its interference on the metal construction.