Abstract
As a newly developed instrument,photonic Doppler velocimetry(PDV) has become an ideal replacement in situations where VISAR diagnostics function poorly.However,there is a limitation on how well this technique works when the velocity of low magnitude is rapidly changing.In this paper,PDV is utilized to capture the free surface velocity history of laser shock peening(LSP),which is a typical signal rises in nanosecond-level short time and fluctuates significantly,and methods of short time Fourier transform and continuous wavelet transform were compared in processing the interference signal.The results show that PDV is an effective diagnostic method to study the characteristics of shock pressure induced in LSP,and the temporal particle velocity profile including the elastic precursor wave is tracked.Compared to the short time Fourier transform,the continuous wavelet transform demonstrates a better temporal resolution and better interpretation to the real physical behavior.
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