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Measurement of fast-changing low velocities by photonic Doppler velocimetry
Song HW(宋宏伟); Wu XQ(吴先前); Huang CG(黄晨光); Wei YP(魏延鹏); Wang X(王曦); Huang, CG; Chinese Acad Sci, Inst Mech, Key Lab Hydrodynam & Ocean Engn, Beijing 100080, Peoples R China.
AbstractDespite the increasing popularity of photonic Doppler velocimetry (PDV) in shock wave experiments, its capability of capturing low particle velocities while changing rapidly is still questionable. The paper discusses the performance of short time Fourier transform (STET) and continuous wavelet transform (CWT) in processing fringe signals of fast-changing low velocities measured by PDV. Two typical experiments are carried out to evaluate the performance. In the laser shock peening test, the CWT gives a better interpretation to the free surface velocity history, where the elastic precursor, main plastic wave, and elastic release wave can be clearly identified. The velocities of stress waves, Hugoniot elastic limit, and the amplitude of shock pressure induced by laser can be obtained from the measurement. In the Kolsky-bar based tests, both methods show validity of processing the longitudinal velocity signal of incident bar, whereas CWT improperly interprets the radial velocity of the shocked sample at the beginning period, indicating the sensitiveness of the CWT to the background noise. STFT is relatively robust in extracting waveforms of low signal-to-noise ratio. Data processing method greatly affects the temporal resolution and velocity resolution of a given fringe signal, usually CWT demonstrates a better local temporal resolution and velocity resolution, due to its adaptability to the local frequency, also due to the finer time-frequency product according to the uncertainty principle.
KeywordContinuous Wavelet Transform Driven Spallation Process Interferometry Technique Phase Recovery Water
Subject Area冲击动力学
Indexed BySCI ; EI
WOS IDWOS:000307527900016
Funding OrganizationThis work is funded by the Instrument Project of Chinese Academy of Sciences (CAS) (Grant No. YZ200930), additional funding is also provided by the National Natural Science Foundation of China (NNSFC) (Grant Nos. 91016025, 10972228, and 11002150). The authors would like to thank Dr. J. Wang and Professor C. Q. Wu at Beijing Jiaotong University for discussion on the data processing method of STFT and CWT.
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHuang, CG; Chinese Acad Sci, Inst Mech, Key Lab Hydrodynam & Ocean Engn, Beijing 100080, Peoples R China.
Recommended Citation
GB/T 7714
Song HW,Wu XQ,Huang CG,et al. Measurement of fast-changing low velocities by photonic Doppler velocimetry[J]. REVIEW OF SCIENTIFIC INSTRUMENTS,2012,83(7):073301.
APA 宋宏伟.,吴先前.,黄晨光.,魏延鹏.,王曦.,...&Chinese Acad Sci, Inst Mech, Key Lab Hydrodynam & Ocean Engn, Beijing 100080, Peoples R China..(2012).Measurement of fast-changing low velocities by photonic Doppler velocimetry.REVIEW OF SCIENTIFIC INSTRUMENTS,83(7),073301.
MLA 宋宏伟,et al."Measurement of fast-changing low velocities by photonic Doppler velocimetry".REVIEW OF SCIENTIFIC INSTRUMENTS 83.7(2012):073301.
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