Laser & Optoelectronics Progress, Volume. 51, Issue 3, 30602(2014)
Displacement Mode Analysis Method for Data Processing of Photonic Doppler Velocimetry
The short time Fourier transform (STFT) and continuous wavelet transform (CWT) cannot resolve slowly varying velocity at low velocity stage in most photonic Doppler velocimetry (PDV) data. A new analysis method based on Fourier transform is presented to overcome this shortcoming. Instead of extracting the frequency of interference signal for velocity analysis, the new method uses a modified Fourier transform to analysis the phase of signal, and converts phase to displacement or velocity. The validity of the proposed method is examined in experimental data of a plate- impact experiment, which distinguishes the elastic- plastic properties of Fe sample. The method not only uses all sampling points of the raw data, but also has a higher velocity resolutions especially for low velocity stage. The method is a supplement to STFT and CWT method.
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Yuan Shuyun, Liu Shouxian, Wang Detian, Chen Guanghua, Li Tao, Li Zeren, Peng Qixian. Displacement Mode Analysis Method for Data Processing of Photonic Doppler Velocimetry[J]. Laser & Optoelectronics Progress, 2014, 51(3): 30602
Category: Fiber Optics and Optical Communications
Received: Oct. 3, 2013
Accepted: --
Published Online: Mar. 3, 2014
The Author Email: Shuyun Yuan (shuyun9700@163.com)