Measurement of fast-changing low velocities by photonic Doppler velocimetry

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	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
刊名	REVIEW OF SCIENTIFIC INSTRUMENTS
	2012-07-01
通讯作者邮箱	songhw@imech.ac.cn;huangcg@imech.ac.cn
卷号	83 期号:7 页码:073301
关键词	Continuous Wavelet Transform Driven Spallation Process Interferometry Technique Phase Recovery Water
ISSN号	0034-6748
通讯作者	Huang, CG ; Chinese Acad Sci, Inst Mech, Key Lab Hydrodynam & Ocean Engn, Beijing 100080, Peoples R China.
产权排序	[Song, Hongwei;Wu, Xianqian; Huang, Chenguang; Wei, Yangpeng; Wang, Xi] Chinese Acad Sci, Inst Mech, Key Lab Hydrodynam & Ocean Engn, Beijing 100080, Peoples R China
中文摘要	Despite 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.
学科主题	冲击动力学
分类号	二类/Q2
收录类别	SCI ; EI
资助信息	This 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.
原文出处	http://dx.doi.org/10.1063/1.4731014
语种	英语
WOS记录号	WOS:000307527900016
公开日期	2013-01-18
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/46642]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
通讯作者	Huang, CG
推荐引用方式 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,&Huang, CG.(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.