Using time-frequency analysis to determine time-resolved detonation velocity with microwave interferometry

Two time-frequency analysis methods based on the short-time Fourier transform (STFT) and continuous wavelet transform (CWT) were used to determine time-resolved detonation velocities with microwave interferometry (MI). The results were directly compared to well-established analysis techniques consis...

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Bibliographic Details
Published in:Review of scientific instruments 2015-04, Vol.86 (4), p.044705-044705
Main Authors: Kittell, David E, Mares, Jr, Jesus O, Son, Steven F
Format: Article
Language:English
Subjects:
Ammonium nitrate
Continuous wavelet transform
Control methods
Detonation
Fourier transforms
Interferometry
Picking
Scientific apparatus & instruments
Signal quality
TATB
Time-frequency analysis
Velocity
Wavelet transforms
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Summary:Two time-frequency analysis methods based on the short-time Fourier transform (STFT) and continuous wavelet transform (CWT) were used to determine time-resolved detonation velocities with microwave interferometry (MI). The results were directly compared to well-established analysis techniques consisting of a peak-picking routine as well as a phase unwrapping method (i.e., quadrature analysis). The comparison is conducted on experimental data consisting of transient detonation phenomena observed in triaminotrinitrobenzene and ammonium nitrate-urea explosives, representing high and low quality MI signals, respectively. Time-frequency analysis proved much more capable of extracting useful and highly resolved velocity information from low quality signals than the phase unwrapping and peak-picking methods. Additionally, control of the time-frequency methods is mainly constrained to a single parameter which allows for a highly unbiased analysis method to extract velocity information. In contrast, the phase unwrapping technique introduces user based variability while the peak-picking technique does not achieve a highly resolved velocity result. Both STFT and CWT methods are proposed as improved additions to the analysis methods applied to MI detonation experiments, and may be useful in similar applications.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4916733