title: Analysis of photonic Doppler velocimetry data based on the continuous wavelet transform.
abstract: The short time Fourier transform (STFT) cannot resolve rapid velocity changes in most photonic Doppler velocimetry (PDV) data. A practical analysis method based on the continuous wavelet transform (CWT) was presented to overcome this difficulty. The adaptability of the wavelet family predicates that the continuous wavelet transform uses an adaptive time window to estimate the instantaneous frequency of signals. The local frequencies of signal are accurately determined by finding the ridge in the spectrogram of the CWT and then are converted to target velocity according to the Doppler effects. A performance comparison between the CWT and STFT is demonstrated by a plate-impact experiment data. The results illustrate that the new method is automatic and adequate for analysis of PDV data.
authors.affiliation: Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, People's Republic of China. pion55@163.com
authors.forename: Shouxian
authors.initials: S
authors.lastname: Liu
authors.forename: Detian
authors.initials: D
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Guanghua
authors.initials: G
authors.lastname: Chen
authors.forename: Zeren
authors.initials: Z
authors.lastname: Li
authors.forename: Qixian
authors.initials: Q
authors.lastname: Peng