Research on the photoelectric measuring method of warhead fragment velocity

Ji Liu; Lixia Yu; Bin Zhang; Xiaoyan Liu

doi:10.1117/12.2242701

27 September 2016 Research on the photoelectric measuring method of warhead fragment velocity

Ji Liu, Lixia Yu, Bin Zhang, Xiaoyan Liu

Proceedings Volume 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment; 968403 (2016) https://doi.org/10.1117/12.2242701
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

The velocity of warhead fragment is the key criteria to determine its mutilation efficiency. But owing to the small size, larger quantity, irregular shape, high speed, arbitrary direction, large dispersion of warhead fragment and adverse environment, the test of fragment velocity parameter is very difficult. The paper designed an optoelectronic system to measure the average velocity of warhead fragments accurately. The apparatus included two parallel laser screens spaced apart at a known fixed distance for providing time measurement between start and stop signals. The large effective screen area was composed of laser source, retro-reflector and large area photo-diode. Whenever a moving fragment interrupted two optical screens, the system would generate a target signal. Due to partial obscuration of the incident energy and the poor test condition of the explosion, fragment target signal is easily disturbed. Therefore, fragments signal processing technology has become a key technology of the system. The noise of signal was reduced by employing wavelet decomposition and reconstruction. The time of fragment passing though the target was obtained by adopting peak detection algorithm. Based on the method of search peak in different width scale and waveform trend by using optima wavelet, the problem of rolling waveform was solved. Lots of fragments experiments of the different types of the warheads were conducted. Experimental results show that: warhead fragments capture rate of system is better than 98%, which can give velocity of each fragment in the density of less than 20 pieces per m².

Citation Download Citation

Ji Liu, Lixia Yu, Bin Zhang, and Xiaoyan Liu "Research on the photoelectric measuring method of warhead fragment velocity", Proc. SPIE 9684, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment, 968403 (27 September 2016); https://doi.org/10.1117/12.2242701

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KEYWORDS

Signal processing

Velocity measurements

Data processing

Detection and tracking algorithms

Laser processing

Telecommunications

Electronic filtering

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