Doppler signal picking technology in measurement of blast shock

作者：Shao Lei^*; Wang Bao Guang; Liu Hong Li; Huang Fu Xiang; Hu Yong Le; Jin Fei Hua; Jiang Cheng Zhi

来源：Journal of Tianjin University, 2007, 40(7): 827-832.

• Blast shock
• Deformation speed
• Doppler signal picking
• Dynamic characteristics
• Explosion container
• High velocity deformation parameters
• Laser Doppler
• Modulus maximum

An optimized heterodyne longitudinal laser Doppler optical structure is adopted to improve the intensity of Doppler signal. Both the most principle frequency method based on short time Fourier transform and the modulus maximum method based on wavelet transform are employed to deal with explosion Doppler signal, which can restrain noise effectively. The measurement distance reaches 4.5 m, the measurement range of deformation speed is from-10 m/s to 20 m/s, and the relative error of measurement is less than 1%. The experiments indicate that the method can pick up Doppler signal associated with dynamic characteristics of blast shock effectively, and realize accurate measurement of high velocity deformation parameters of explosion container.

• 出版日期2007
• 单位天津大学